Creating a super-class for modems

README.md

@@ -35,29 +35,29 @@ TinyGSM also pulls data gently from the modem (whenever possible), so it can ope
 
 ## Features
 
-Feature \ Modem              | SIM8xx | u-Blox | A6/A7/A20 | M590 | ESP8266 | XBee
----                          | ---    | ---    | ---       | ---  | ---     | ---
+Feature \ Modem              | SIM8xx | u-Blox | A6/A7/A20 | M590 | ESP8266 | XBee | Quectel M95 |
+---                          | ---    | ---    | ---       | ---  | ---     | ---  | ----------- |
 **Data connections**
-TCP (HTTP, MQTT, Blynk, ...) | ✔      | ✔      | ✔         | ✔    | ✔       | ✔
-UDP                          | ◌      | ◌      |           |      |         | ◌
-SSL/TLS (HTTPS)              | ✔¹     | ✔      | 🅧        | 🅧    | ✔¹      | ✔¹
+TCP (HTTP, MQTT, Blynk, ...) | ✔      | ✔      | ✔         | ✔    | ✔       | ✔    | ✔           |
+UDP                          | ◌      | ◌      |           |      |         | ◌    | ◌           |
+SSL/TLS (HTTPS)              | ✔¹     | ✔      | 🅧        | 🅧    | ✔¹      | ✔¹    |             |
 **USSD**
-Sending USSD requests        | ✔      |        | ✔         | ✔    | 🅧       |
-Decoding 7,8,16-bit response | ✔      |        | ✔         | ✔    | 🅧      |
+Sending USSD requests        | ✔      |        | ✔         | ✔    | 🅧       |      |             |
+Decoding 7,8,16-bit response | ✔      |        | ✔         | ✔    | 🅧      |      |             |
 **SMS**
-Sending                      | ✔      | ✔      | ✔         | ✔    | 🅧      | ✔
-Sending Unicode              | ✔      |        | ◌         | 🅧   | 🅧      |
-Reading                      |        |        |           |      | 🅧      |
-Incoming message event       |        |        |           | ?    | 🅧      |
+Sending                      | ✔      | ✔      | ✔         | ✔    | 🅧      | ✔    | ✔           |
+Sending Unicode              | ✔      |        | ◌         | 🅧   | 🅧      |       | ?           |
+Reading                      |        |        |           |      | 🅧      |      | ?           |
+Incoming message event       |        |        |           | ?    | 🅧      |      |             |
 **Calls**
-Dial, hangup                 | ✔      |        | ✔         | 🅧   | 🅧      | 🅧
-Receiving calls              | ✔      |        | ✔         | 🅧   | 🅧      | 🅧
-Incoming event (RING)        | ◌      |        | ◌         | 🅧   | 🅧      | 🅧
-DTMF sending                 | ✔      |        | ✔         | 🅧   | 🅧      | 🅧
-DTMF decoding                | ◌      |        | 🅧        | 🅧   | 🅧      | 🅧
+Dial, hangup                 | ✔      |        | ✔         | 🅧   | 🅧      | 🅧     | ?           |
+Receiving calls              | ✔      |        | ✔         | 🅧   | 🅧      | 🅧     | ?           |
+Incoming event (RING)        | ◌      |        | ◌         | 🅧   | 🅧      | 🅧     | ?           |
+DTMF sending                 | ✔      |        | ✔         | 🅧   | 🅧      | 🅧     | ?           |
+DTMF decoding                | ◌      |        | 🅧        | 🅧   | 🅧      | 🅧     | ?           |
 **Location**
-GSM location service         | ✔      | ✔      | 🅧        | 🅧   | 🅧      | ✔
-GPS/GNSS                     | ✔¹     | 🅧     | ◌¹        | 🅧   | 🅧      | 🅧
+GSM location service         | ✔      | ✔      | 🅧        | 🅧   | 🅧      | ✔ | 🅧 |
+GPS/GNSS                     | ✔¹     | 🅧     | ◌¹        | 🅧   | 🅧      | 🅧 | 🅧 |
 
 ✔ - implemented  ◌ - planned  🅧 - not available on this modem  
 ¹ - only some device models or firmware revisions have this feature (SIM8xx R14.18, A7, etc.)  
@@ -72,6 +72,8 @@ GPS/GNSS                     | ✔¹     | 🅧     | ◌¹        | 🅧   |
 - Neoway M590
 - u-blox Cellular Modems (LEON-G100, LISA-U2xx, SARA-G3xx, SARA-U2xx, TOBY-L2xx, LARA-R2xx, MPCI-L2xx)
 - Quectel BG96 ***(alpha)***
+- Quectel M95 ***(alpha)***
+- Quectel MC60 ***(alpha)***
 
 ### Supported boards/modules
 - Arduino MKR GSM 1400
@@ -84,8 +86,8 @@ GPS/GNSS                     | ✔¹     | 🅧     | ◌¹        | 🅧   |
 - ... other modules, based on supported modems. Some boards require [**special configuration**](https://github.com/vshymanskyy/TinyGSM/wiki/Board-configuration).
 
 More modems may be supported later:
-- [ ] Quectel M10, M35, M95, UG95, EC21
 - [ ] Sequans Monarch LTE Cat M1/NB1
+- [ ] Quectel M10, UG95
 - [ ] SIMCom SIM5320, SIM5360, SIM5216, SIM7xxx
 - [ ] Telit GL865
 - [ ] ZTE MG2639

examples/AllFunctions/AllFunctions.ino

@@ -18,6 +18,8 @@
 // #define TINY_GSM_MODEM_A6
 // #define TINY_GSM_MODEM_A7
 // #define TINY_GSM_MODEM_M590
+// #define TINY_GSM_MODEM_MC60
+// #define TINY_GSM_MODEM_MC60E
 
 // Set serial for debug console (to the Serial Monitor, speed 115200)
 #define SerialMon Serial
@@ -34,6 +36,22 @@
 //#define DUMP_AT_COMMANDS
 #define TINY_GSM_DEBUG SerialMon
 
+#define GSM_AUTOBAUD_MIN 9600
+#define GSM_AUTOBAUD_MAX 38400
+
+/*
+ * Test enabled
+ */
+#define TINY_GSM_USE_GPRS true
+#define TINY_GSM_USE_CALL true
+#define TINY_GSM_USE_SMS true
+#define TINY_GSM_USE_USSD true
+// powerdown modem after tests
+#define TINY_GSM_POWERDOWN false
+
+// set GSM PIN, if any
+#define GSM_PIN ""
+
 // Set phone numbers, if you want to test SMS and Calls
 //#define SMS_TARGET  "+380xxxxxxxxx"
 //#define CALL_TARGET "+380xxxxxxxxx"
@@ -64,7 +82,7 @@ void setup() {
   delay(3000);
 
   // Set GSM module baud rate
-  TinyGsmAutoBaud(SerialAT);
+  TinyGsmAutoBaud(SerialAT,GSM_AUTOBAUD_MIN,GSM_AUTOBAUD_MAX);
 }
 
 void loop() {
@@ -73,6 +91,10 @@ void loop() {
   // To skip it, call init() instead of restart()
   DBG("Initializing modem...");
   if (!modem.restart()) {
+    DBG("Failed to restart modem, delayin 10s and retring");
+    delay(3000);
+    // restart autobaud in case GSM just rebooted
+    TinyGsmAutoBaud(SerialAT,GSM_AUTOBAUD_MIN,GSM_AUTOBAUD_MAX);
     delay(10000);
     return;
   }
@@ -80,8 +102,10 @@ void loop() {
   String modemInfo = modem.getModemInfo();
   DBG("Modem:", modemInfo);
 
-  // Unlock your SIM card with a PIN
-  //modem.simUnlock("1234");
+  // Unlock your SIM card with a PIN if needed
+  if ( GSM_PIN && modem.getSimStatus() != 3 ) { 
+    modem.simUnlock(GSM_PIN);
+  }
 
   DBG("Waiting for network...");
   if (!modem.waitForNetwork()) {
@@ -93,11 +117,13 @@ void loop() {
     DBG("Network connected");
   }
 
+#if TINY_GSM_USE_GPRS
   DBG("Connecting to", apn);
   if (!modem.gprsConnect(apn, user, pass)) {
     delay(10000);
     return;
   }
+#endif
 
   bool res = modem.isGprsConnected();
   DBG("GPRS status:", res ? "connected" : "not connected");
@@ -113,6 +139,7 @@ void loop() {
 
   IPAddress local = modem.localIP();
   DBG("Local IP:", local);
+#endif
 
   int csq = modem.getSignalQuality();
   DBG("Signal quality:", csq);
@@ -140,15 +167,16 @@ void loop() {
 
   String ussd_phone_num = modem.sendUSSD("*161#");
   DBG("Phone number (USSD):", ussd_phone_num);
+#endif
 
-#if defined(TINY_GSM_MODEM_SIM808)
+#if defined(TINY_GSM_MODEM_HAS_GPS)
   modem.enableGPS();
   String gps_raw = modem.getGPSraw();
   modem.disableGPS();
   DBG("GPS raw data:", gps_raw);
 #endif
 
-#if defined(SMS_TARGET)
+#if TINY_GSM_USE_SMS && defined(SMS_TARGET)
   res = modem.sendSMS(SMS_TARGET, String("Hello from ") + imei);
   DBG("SMS:", res ? "OK" : "fail");
 
@@ -157,7 +185,7 @@ void loop() {
   DBG("UTF16 SMS:", res ? "OK" : "fail");
 #endif
 
-#if defined(CALL_TARGET)
+#if TINY_GSM_USE_CALL && defined(CALL_TARGET)
   DBG("Calling:", CALL_TARGET);
 
   // This is NOT supported on M590
@@ -182,21 +210,24 @@ void loop() {
   }
 #endif
 
+#if TINY_GSM_USE_GPRS
   modem.gprsDisconnect();
   if (!modem.isGprsConnected()) {
     DBG("GPRS disconnected");
   } else {
     DBG("GPRS disconnect: Failed.");
   }
+#endif
 
+#if TINY_GSM_POWERDOWN 
   // Try to power-off (modem may decide to restart automatically)
   // To turn off modem completely, please use Reset/Enable pins
   modem.poweroff();
   DBG("Poweroff.");
+#endif
 
   // Do nothing forevermore
   while (true) {
     modem.maintain();
   }
 }
-

library.json

@@ -1,6 +1,6 @@
 {
   "name": "TinyGSM",
-  "version": "0.3.5",
+  "version": "0.3.6",
   "description": "A small Arduino library for GPRS modules, that just works. Includes examples for Blynk, MQTT, File Download, and Web Client. Supports GSM modules with AT command interface: SIM800, SIM800A, SIM800C, SIM800L, SIM800H, SIM808, SIM868, SIM900, SIM900A, SIM900D, SIM908, SIM968",
   "keywords": "GSM, AT commands, AT, SIM800, SIM900, A6, A7, M590, ESP8266, SIM800A, SIM800C, SIM800L, SIM800H, SIM808, SIM868, SIM900A, SIM900D, SIM908, SIM968",
   "authors":

library.properties

@@ -1,9 +1,9 @@
 name=TinyGSM
-version=0.3.5
+version=0.3.6
 author=Volodymyr Shymanskyy
 maintainer=Volodymyr Shymanskyy
 sentence=A small Arduino library for GPRS modules, that just works.
-paragraph=Includes examples for Blynk, MQTT, File Download, and Web Client. Supports GSM modules with AT command interface: SIM800, SIM900, A6, A7, M590, ESP8266, SIM800A, SIM800C, SIM800L, SIM800H, SIM808, SIM868, SIM900A, SIM900D, SIM908, SIM968
+paragraph=Includes examples for Blynk, MQTT, File Download, and Web Client. Supports many GSM and wifi modules with AT command interfaces.
 category=Communication
 url=https://github.com/vshymanskyy/TinyGSM
 architectures=*

src/TinyGsmClient.h

@@ -13,7 +13,7 @@
   #define TINY_GSM_MODEM_HAS_SSL
 #endif
 
-#if defined(TINY_GSM_MODEM_SIM808) || defined(TINY_GSM_MODEM_SIM868) || defined(TINY_GSM_MODEM_A7)
+#if defined(TINY_GSM_MODEM_SIM808) || defined(TINY_GSM_MODEM_SIM868) || defined(TINY_GSM_MODEM_A7) || defined(TINY_GSM_MODEM_MC60) || defined(TINY_GSM_MODEM_MC60E)
   #define TINY_GSM_MODEM_HAS_GPS
 #endif
 
@@ -38,6 +38,12 @@
   typedef TinyGsmUBLOX::GsmClient TinyGsmClient;
   typedef TinyGsmUBLOX::GsmClientSecure TinyGsmClientSecure;
 
+#elif defined(TINY_GSM_MODEM_M95)
+  #define TINY_GSM_MODEM_HAS_GPRS
+  #include <TinyGsmClientM95.h>
+  typedef TinyGsmM95 TinyGsm;
+  typedef TinyGsmM95::GsmClient TinyGsmClient;
+
 #elif defined(TINY_GSM_MODEM_BG96)
   #define TINY_GSM_MODEM_HAS_GPRS
   #include <TinyGsmClientBG96.h>
@@ -56,6 +62,11 @@
   typedef TinyGsmM590 TinyGsm;
   typedef TinyGsmM590::GsmClient TinyGsmClient;
 
+#elif defined(TINY_GSM_MODEM_MC60) || defined(TINY_GSM_MODEM_MC60E)
+  #include <TinyGsmClientMC60.h>
+  typedef TinyGsmMC60 TinyGsm;
+  typedef TinyGsmMC60::GsmClient TinyGsmClient;
+
 #elif defined(TINY_GSM_MODEM_ESP8266)
   #define TINY_GSM_MODEM_HAS_WIFI
   #include <TinyGsmClientESP8266.h>

src/TinyGsmClientA6.h

@@ -39,7 +39,7 @@ enum RegStatus {
 };
 
 
-class TinyGsmA6
+class TinyGsmA6 : public TinyGsmModem
 {
 
 public:
@@ -178,7 +178,7 @@ private:
 public:
 
   TinyGsmA6(Stream& stream)
-    : stream(stream)
+    : TinyGsmModem(stream), stream(stream)
   {
     memset(sockets, 0, sizeof(sockets));
   }
@@ -186,11 +186,8 @@ public:
   /*
    * Basic functions
    */
-  bool begin() {
-    return init();
-  }
 
-  bool init() {
+  bool init(const char* pin = NULL) {
     if (!testAT()) {
       return false;
     }
@@ -208,6 +205,15 @@ public:
     return true;
   }
 
+  String getModemName() {
+    #if defined(TINY_GSM_MODEM_A6)
+      return "AI-Thinker A6";
+    #elif defined(TINY_GSM_MODEM_A7)
+      return "AI-Thinker A7";
+    #endif
+    return "AI-Thinker A6";
+  }
+
   void setBaud(unsigned long baud) {
     sendAT(GF("+IPR="), baud);
   }
@@ -251,6 +257,14 @@ public:
     return false;
   }
 
+  bool hasWifi() {
+    return false;
+  }
+
+  bool hasGPRS() {
+    return true;
+  }
+
   /*
    * Power functions
    */
@@ -367,22 +381,6 @@ public:
     return (s == REG_OK_HOME || s == REG_OK_ROAMING);
   }
 
-  bool waitForNetwork(unsigned long timeout = 60000L) {
-    for (unsigned long start = millis(); millis() - start < timeout; ) {
-      if (isNetworkConnected()) {
-        return true;
-      }
-      delay(250);
-    }
-    return false;
-  }
-
-  /*
-   * WiFi functions
-   */
-  bool networkConnect(const char* ssid, const char* pwd) TINY_GSM_ATTR_NOT_AVAILABLE;
-  bool networkDisconnect() TINY_GSM_ATTR_NOT_AVAILABLE;
-
   /*
    * GPRS functions
    */
@@ -441,6 +439,10 @@ public:
     return (res == 1);
   }
 
+  /*
+   * IP Address functions
+   */
+
   String getLocalIP() {
     sendAT(GF("+CIFSR"));
     String res;
@@ -453,10 +455,6 @@ public:
     return res;
   }
 
-  IPAddress localIP() {
-    return TinyGsmIpFromString(getLocalIP());
-  }
-
   /*
    * Phone Call functions
    */
@@ -606,6 +604,10 @@ public:
     return res;
   }
 
+  /*
+   * Client related functions
+   */
+
 protected:
 
   bool modemConnect(const char* host, uint16_t port, uint8_t* mux) {
@@ -650,30 +652,9 @@ protected:
 
 public:
 
-  /* Utilities */
-
-  template<typename T>
-  void streamWrite(T last) {
-    stream.print(last);
-  }
-
-  template<typename T, typename... Args>
-  void streamWrite(T head, Args... tail) {
-    stream.print(head);
-    streamWrite(tail...);
-  }
-
-  bool streamSkipUntil(char c, const unsigned long timeout = 1000L) {
-    unsigned long startMillis = millis();
-    while (millis() - startMillis < timeout) {
-      while (millis() - startMillis < timeout && !stream.available()) {
-        TINY_GSM_YIELD();
-      }
-      if (stream.read() == c)
-        return true;
-    }
-    return false;
-  }
+  /*
+   Utilities
+   */
 
   template<typename... Args>
   void sendAT(Args... cmd) {

src/TinyGsmClientBG96.h

@@ -40,7 +40,7 @@ enum RegStatus {
 };
 
 
-class TinyGsmBG96
+class TinyGsmBG96 : public TinyGsmModem
 {
 
 public:
@@ -115,7 +115,7 @@ public:
 
   virtual int available() {
     TINY_GSM_YIELD();
-    if (!rx.size()) {
+    if (!rx.size() && sock_connected) {
       at->maintain();
     }
     return rx.size() + sock_available;
@@ -125,7 +125,7 @@ public:
     TINY_GSM_YIELD();
     at->maintain();
     size_t cnt = 0;
-    while (cnt < size) {
+    while (cnt < size && sock_connected) {
       size_t chunk = TinyGsmMin(size-cnt, rx.size());
       if (chunk > 0) {
         rx.get(buf, chunk);
@@ -179,30 +179,30 @@ private:
 };
 
 
-class GsmClientSecure : public GsmClient
-{
-public:
-  GsmClientSecure() {}
-
-  GsmClientSecure(TinyGsmBG96& modem, uint8_t mux = 1)
-    : GsmClient(modem, mux)
-  {}
-
-public:
-  virtual int connect(const char *host, uint16_t port) {
-    stop();
-    TINY_GSM_YIELD();
-    rx.clear();
-    sock_connected = at->modemConnect(host, port, mux, true);
-    return sock_connected;
-  }
-};
+// class GsmClientSecure : public GsmClient
+// {
+// public:
+//   GsmClientSecure() {}
+//
+//   GsmClientSecure(TinyGsmBG96& modem, uint8_t mux = 1)
+//     : GsmClient(modem, mux)
+//   {}
+//
+// public:
+//   virtual int connect(const char *host, uint16_t port) {
+//     stop();
+//     TINY_GSM_YIELD();
+//     rx.clear();
+//     sock_connected = at->modemConnect(host, port, mux, true);
+//     return sock_connected;
+//   }
+// };
 
 
 public:
 
   TinyGsmBG96(Stream& stream)
-    : stream(stream)
+    : TinyGsmModem(stream), stream(stream)
   {
     memset(sockets, 0, sizeof(sockets));
   }
@@ -210,11 +210,8 @@ public:
   /*
    * Basic functions
    */
-  bool begin() {
-    return init();
-  }
 
-  bool init() {
+  bool init(const char* pin = NULL) {
     if (!testAT()) {
       return false;
     }
@@ -226,6 +223,10 @@ public:
     return true;
   }
 
+  String getModemName() {
+    return "Quectel BG96";
+  }
+
   void setBaud(unsigned long baud) {
     sendAT(GF("+IPR="), baud);
   }
@@ -280,6 +281,14 @@ public:
     return false;  // TODO: For now
   }
 
+  bool hasWifi() {
+    return false;
+  }
+
+  bool hasGPRS() {
+    return true;
+  }
+
   /*
    * Power functions
    */
@@ -401,44 +410,30 @@ public:
     return (s == REG_OK_HOME || s == REG_OK_ROAMING);
   }
 
-  bool waitForNetwork(unsigned long timeout = 60000L) {
-    for (unsigned long start = millis(); millis() - start < timeout; ) {
-      if (isNetworkConnected()) {
-        return true;
-      }
-      delay(250);
-    }
-    return false;
-  }
-
-  /*
-   * WiFi functions
-   */
-  bool networkConnect(const char* ssid, const char* pwd) TINY_GSM_ATTR_NOT_AVAILABLE;
-  bool networkDisconnect() TINY_GSM_ATTR_NOT_AVAILABLE;
-
   /*
    * GPRS functions
    */
   bool gprsConnect(const char* apn, const char* user = NULL, const char* pwd = NULL) {
     gprsDisconnect();
 
+    //Configure the TCPIP Context
     sendAT(GF("+QICSGP=1,1,\""), apn, GF("\",\""), user, GF("\",\""), pwd, GF("\""));
     if (waitResponse() != 1) {
       return false;
     }
 
+    //Activate GPRS/CSD Context
     sendAT(GF("+QIACT=1"));
     if (waitResponse(150000L) != 1) {
       return false;
     }
 
+    //Attach to Packet Domain service - is this necessary?
     sendAT(GF("+CGATT=1"));
     if (waitResponse(60000L) != 1) {
       return false;
     }
 
-
     return true;
   }
 
@@ -463,12 +458,13 @@ public:
     return localIP() != 0;
   }
 
+  /*
+   * IP Address functions
+   */
+
   String getLocalIP() {
-    sendAT(GF("+CGPADDR=1"));
-    if (waitResponse(10000L, GF(GSM_NL "+CGPADDR:")) != 1) {
-      return "";
-    }
-    streamSkipUntil(',');
+    sendAT(GF("+QILOCIP"));
+    stream.readStringUntil('\n');
     String res = stream.readStringUntil('\n');
     if (waitResponse() != 1) {
       return "";
@@ -476,10 +472,6 @@ public:
     return res;
   }
 
-  IPAddress localIP() {
-    return TinyGsmIpFromString(getLocalIP());
-  }
-
   /*
    * Phone Call functions
    */
@@ -535,6 +527,8 @@ public:
   bool sendSMS_UTF16(const String& number, const void* text, size_t len) {
     sendAT(GF("+CMGF=1"));
     waitResponse();
+    sendAT(GF("+CSCS=\"HEX\""));
+    waitResponse();
     sendAT(GF("+CSMP=17,167,0,8"));
     waitResponse();
 
@@ -567,14 +561,42 @@ public:
   /*
    * Battery functions
    */
-  uint16_t getBattVoltage() TINY_GSM_ATTR_NOT_IMPLEMENTED;
 
-  int getBattPercent() TINY_GSM_ATTR_NOT_IMPLEMENTED;
+  // Use: float vBatt = modem.getBattVoltage() / 1000.0;
+  uint16_t getBattVoltage() {
+    sendAT(GF("+CBC"));
+    if (waitResponse(GF(GSM_NL "+CBC:")) != 1) {
+      return 0;
+    }
+    streamSkipUntil(','); // Skip
+    streamSkipUntil(','); // Skip
+
+    uint16_t res = stream.readStringUntil(',').toInt();
+    waitResponse();
+    return res;
+  }
+
+  int getBattPercent() {
+    sendAT(GF("+CBC"));
+    if (waitResponse(GF(GSM_NL "+CBC:")) != 1) {
+      return false;
+    }
+    stream.readStringUntil(',');
+    int res = stream.readStringUntil(',').toInt();
+    waitResponse();
+    return res;
+  }
+
+  /*
+   * Client related functions
+   */
 
 protected:
 
   bool modemConnect(const char* host, uint16_t port, uint8_t mux, bool ssl = false) {
     int rsp;
+    // <PDPcontextID>(1-16), <connectID>(0-11),"TCP/UDP/TCP LISTENER/UDP SERVICE",
+    // "<IP_address>/<domain_name>",<remote_port>,<local_port>,<access_mode>(0-2 0=buffer)
     sendAT(GF("+QIOPEN=1,"), mux, ',', GF("\"TCP"), GF("\",\""), host, GF("\","), port, GF(",0,0"));
     rsp = waitResponse();
 
@@ -660,30 +682,9 @@ protected:
 
 public:
 
-  /* Utilities */
-
-  template<typename T>
-  void streamWrite(T last) {
-    stream.print(last);
-  }
-
-  template<typename T, typename... Args>
-  void streamWrite(T head, Args... tail) {
-    stream.print(head);
-    streamWrite(tail...);
-  }
-
-  bool streamSkipUntil(char c, const unsigned long timeout = 1000L) {
-    unsigned long startMillis = millis();
-    while (millis() - startMillis < timeout) {
-      while (millis() - startMillis < timeout && !stream.available()) {
-        TINY_GSM_YIELD();
-      }
-      if (stream.read() == c)
-        return true;
-    }
-    return false;
-  }
+  /*
+   Utilities
+   */
 
   template<typename... Args>
   void sendAT(Args... cmd) {

src/TinyGsmClientESP8266.h

@@ -39,7 +39,7 @@ enum RegStatus {
 
 
 
-class TinyGsmESP8266
+class TinyGsmESP8266 : public TinyGsmModem
 {
 
 public:
@@ -191,10 +191,11 @@ public:
   }
 };
 
+
 public:
 
   TinyGsmESP8266(Stream& stream)
-    : stream(stream)
+    : TinyGsmModem(stream), stream(stream)
   {
     memset(sockets, 0, sizeof(sockets));
   }
@@ -202,11 +203,8 @@ public:
   /*
    * Basic functions
    */
-  bool begin() {
-    return init();
-  }
 
-  bool init() {
+  bool init(const char* pin = NULL) {
     if (!testAT()) {
       return false;
     }
@@ -225,6 +223,10 @@ public:
     return true;
   }
 
+  String getModemName() {
+    return "ESP8266";
+  }
+
   void setBaud(unsigned long baud) {
     sendAT(GF("+IPR="), baud);
   }
@@ -266,6 +268,14 @@ public:
     return true;
   }
 
+  bool hasWifi() {
+    return true;
+  }
+
+  bool hasGPRS() {
+    return false;
+  }
+
   /*
    * Power functions
    */
@@ -362,6 +372,10 @@ public:
     return retVal;
   }
 
+  /*
+   * IP Address functions
+   */
+
   String getLocalIP() {
     sendAT(GF("+CIPSTA_CUR??"));
     int res1 = waitResponse(GF("ERROR"), GF("+CWJAP_CUR:"));
@@ -373,33 +387,9 @@ public:
     return res2;
   }
 
-  IPAddress localIP() {
-    return TinyGsmIpFromString(getLocalIP());
-  }
-
   /*
-   * GPRS functions
+   * Client related functions
    */
-  bool gprsConnect(const char* apn, const char* user = NULL, const char* pwd = NULL) TINY_GSM_ATTR_NOT_AVAILABLE;
-  bool gprsDisconnect() TINY_GSM_ATTR_NOT_AVAILABLE;
-
-  /*
-   * Messaging functions
-   */
-
-  /*
-   * Location functions
-   */
-
-  String getGsmLocation() TINY_GSM_ATTR_NOT_AVAILABLE;
-
-  /*
-   * Battery functions
-   */
-
-  uint16_t getBattVoltage() TINY_GSM_ATTR_NOT_AVAILABLE;
-
-  int getBattPercent() TINY_GSM_ATTR_NOT_AVAILABLE;
 
 protected:
 
@@ -438,30 +428,9 @@ protected:
 
 public:
 
-  /* Utilities */
-
-  template<typename T>
-  void streamWrite(T last) {
-    stream.print(last);
-  }
-
-  template<typename T, typename... Args>
-  void streamWrite(T head, Args... tail) {
-    stream.print(head);
-    streamWrite(tail...);
-  }
-
-  bool streamSkipUntil(char c, const unsigned long timeout = 1000L) {
-    unsigned long startMillis = millis();
-    while (millis() - startMillis < timeout) {
-      while (millis() - startMillis < timeout && !stream.available()) {
-        TINY_GSM_YIELD();
-      }
-      if (stream.read() == c)
-        return true;
-    }
-    return false;
-  }
+  /*
+   Utilities
+   */
 
   template<typename... Args>
   void sendAT(Args... cmd) {

src/TinyGsmClientM590.h

@@ -39,7 +39,7 @@ enum RegStatus {
 };
 
 
-class TinyGsmM590
+class TinyGsmM590 : public TinyGsmModem
 {
 
 public:
@@ -175,7 +175,7 @@ private:
 public:
 
   TinyGsmM590(Stream& stream)
-    : stream(stream)
+    : TinyGsmModem(stream), stream(stream)
   {
     memset(sockets, 0, sizeof(sockets));
   }
@@ -183,11 +183,8 @@ public:
   /*
    * Basic functions
    */
-  bool begin() {
-    return init();
-  }
 
-  bool init() {
+  bool init(const char* pin = NULL) {
     if (!testAT()) {
       return false;
     }
@@ -204,6 +201,10 @@ public:
     return true;
   }
 
+  String getModemName() {
+    return "Neoway M590";
+  }
+
   void setBaud(unsigned long baud) {
     sendAT(GF("+IPR="), baud);
   }
@@ -255,6 +256,14 @@ public:
     return false;
   }
 
+  bool hasWifi() {
+    return false;
+  }
+
+  bool hasGPRS() {
+    return true;
+  }
+
   /*
    * Power functions
    */
@@ -375,22 +384,6 @@ public:
     return (s == REG_OK_HOME || s == REG_OK_ROAMING);
   }
 
-  bool waitForNetwork(unsigned long timeout = 60000L) {
-    for (unsigned long start = millis(); millis() - start < timeout; ) {
-      if (isNetworkConnected()) {
-        return true;
-      }
-      delay(250);
-    }
-    return false;
-  }
-
-  /*
-   * WiFi functions
-   */
-  bool networkConnect(const char* ssid, const char* pwd) TINY_GSM_ATTR_NOT_AVAILABLE;
-  bool networkDisconnect() TINY_GSM_ATTR_NOT_AVAILABLE;
-
   /*
    * GPRS functions
    */
@@ -447,6 +440,10 @@ public:
     return res == 1;
   }
 
+  /*
+   * IP Address functions
+   */
+
   String getLocalIP() {
     sendAT(GF("+XIIC?"));
     if (waitResponse(GF(GSM_NL "+XIIC:")) != 1) {
@@ -459,10 +456,6 @@ public:
     return res;
   }
 
-  IPAddress localIP() {
-    return TinyGsmIpFromString(getLocalIP());
-  }
-
   /*
    * Phone Call functions
    */
@@ -538,6 +531,10 @@ public:
 
   int getBattPercent() TINY_GSM_ATTR_NOT_AVAILABLE;
 
+  /*
+   * Client related functions
+   */
+
 protected:
 
   bool modemConnect(const char* host, uint16_t port, uint8_t mux) {
@@ -595,30 +592,9 @@ protected:
 
 public:
 
-  /* Utilities */
-
-  template<typename T>
-  void streamWrite(T last) {
-    stream.print(last);
-  }
-
-  template<typename T, typename... Args>
-  void streamWrite(T head, Args... tail) {
-    stream.print(head);
-    streamWrite(tail...);
-  }
-
-  bool streamSkipUntil(char c, const unsigned long timeout = 1000L) {
-    unsigned long startMillis = millis();
-    while (millis() - startMillis < timeout) {
-      while (millis() - startMillis < timeout && !stream.available()) {
-        TINY_GSM_YIELD();
-      }
-      if (stream.read() == c)
-        return true;
-    }
-    return false;
-  }
+  /*
+   Utilities
+   */
 
   template<typename... Args>
   void sendAT(Args... cmd) {

src/TinyGsmClientM95.h

@@ -0,0 +1,843 @@
+/**
+ * @file       TinyGsmClientM95.h
+ * @author     Volodymyr Shymanskyy, Pacman Pereira, and Replicade Ltd.
+ * @license    LGPL-3.0
+ * @copyright  Copyright (c) 2016 Volodymyr Shymanskyy, (c)2017 Replicade Ltd. <http://www.replicade.com>
+ * @date       Nov 2016
+ */
+
+#ifndef TinyGsmClientM95_h
+#define TinyGsmClientM95_h
+
+//#define TINY_GSM_DEBUG Serial
+//#define TINY_GSM_USE_HEX
+
+#if !defined(TINY_GSM_RX_BUFFER)
+  #define TINY_GSM_RX_BUFFER 64
+#endif
+
+#define TINY_GSM_MUX_COUNT 6
+
+#include <TinyGsmCommon.h>
+
+#define GSM_NL "\r\n"
+static const char GSM_OK[] TINY_GSM_PROGMEM = "OK" GSM_NL;
+static const char GSM_ERROR[] TINY_GSM_PROGMEM = "ERROR" GSM_NL;
+
+enum SimStatus {
+  SIM_ERROR = 0,
+  SIM_READY = 1,
+  SIM_LOCKED = 2,
+};
+
+enum RegStatus {
+  REG_UNREGISTERED = 0,
+  REG_SEARCHING    = 2,
+  REG_DENIED       = 3,
+  REG_OK_HOME      = 1,
+  REG_OK_ROAMING   = 5,
+  REG_UNKNOWN      = 4,
+};
+
+
+class TinyGsmM95 : public TinyGsmModem
+{
+
+public:
+
+class GsmClient : public Client
+{
+  friend class TinyGsmM95;
+  typedef TinyGsmFifo<uint8_t, TINY_GSM_RX_BUFFER> RxFifo;
+
+public:
+  GsmClient() {}
+
+  GsmClient(TinyGsmM95& modem, uint8_t mux = 1) {
+    init(&modem, mux);
+  }
+
+  bool init(TinyGsmM95* modem, uint8_t mux = 1) {
+    this->at = modem;
+    this->mux = mux;
+    sock_available = 0;
+    sock_connected = false;
+    got_data = false;
+
+    at->sockets[mux] = this;
+
+    return true;
+  }
+
+public:
+  virtual int connect(const char *host, uint16_t port) {
+    stop();
+    TINY_GSM_YIELD();
+    rx.clear();
+    sock_connected = at->modemConnect(host, port, mux);
+    return sock_connected;
+  }
+
+  virtual int connect(IPAddress ip, uint16_t port) {
+    String host; host.reserve(16);
+    host += ip[0];
+    host += ".";
+    host += ip[1];
+    host += ".";
+    host += ip[2];
+    host += ".";
+    host += ip[3];
+    return connect(host.c_str(), port);
+  }
+
+  virtual void stop() {
+    TINY_GSM_YIELD();
+    at->sendAT(GF("+QICLOSE="), mux);
+    sock_connected = false;
+    at->waitResponse(60000L, GF("CLOSED"), GF("CLOSE OK"), GF("ERROR"));
+    rx.clear();
+  }
+
+  virtual size_t write(const uint8_t *buf, size_t size) {
+    TINY_GSM_YIELD();
+    at->maintain();
+    return at->modemSend(buf, size, mux);
+  }
+
+  virtual size_t write(uint8_t c) {
+    return write(&c, 1);
+  }
+
+  virtual size_t write(const char *str) {
+    if (str == NULL) return 0;
+    return write((const uint8_t *)str, strlen(str));
+  }
+
+  virtual int available() {
+    TINY_GSM_YIELD();
+    if (!rx.size() && sock_connected) {
+      at->maintain();
+    }
+    return rx.size() + sock_available;
+  }
+
+  virtual int read(uint8_t *buf, size_t size) {
+    TINY_GSM_YIELD();
+    at->maintain();
+    size_t cnt = 0;
+    while (cnt < size && sock_connected) {
+      size_t chunk = TinyGsmMin(size-cnt, rx.size());
+      if (chunk > 0) {
+        rx.get(buf, chunk);
+        buf += chunk;
+        cnt += chunk;
+        continue;
+      }
+      // TODO: Read directly into user buffer?
+      at->maintain();
+      if (sock_available > 0) {
+        at->modemRead(rx.free(), mux);
+      } else {
+        break;
+      }
+    }
+    return cnt;
+  }
+
+  virtual int read() {
+    uint8_t c;
+    if (read(&c, 1) == 1) {
+      return c;
+    }
+    return -1;
+  }
+
+  virtual int peek() { return -1; } //TODO
+  virtual void flush() { at->stream.flush(); }
+
+  virtual uint8_t connected() {
+    if (available()) {
+      return true;
+    }
+    return sock_connected;
+  }
+  virtual operator bool() { return connected(); }
+
+  /*
+   * Extended API
+   */
+
+  String remoteIP() TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
+private:
+  TinyGsmM95*   at;
+  uint8_t       mux;
+  uint16_t      sock_available;
+  bool          sock_connected;
+  bool          got_data;
+  RxFifo        rx;
+};
+
+
+// class GsmClientSecure : public GsmClient
+// {
+// public:
+//   GsmClientSecure() {}
+//
+//   GsmClientSecure(TinyGsmm95& modem, uint8_t mux = 1)
+//     : GsmClient(modem, mux)
+//   {}
+//
+// public:
+//   virtual int connect(const char *host, uint16_t port) {
+//     stop();
+//     TINY_GSM_YIELD();
+//     rx.clear();
+//     sock_connected = at->modemConnect(host, port, mux, true);
+//     return sock_connected;
+//   }
+// };
+
+
+public:
+
+  TinyGsmM95(Stream& stream)
+    : TinyGsmModem(stream), stream(stream)
+  {
+    memset(sockets, 0, sizeof(sockets));
+  }
+
+  /*
+   * Basic functions
+   */
+
+  bool init(const char* pin = NULL) {
+    if (!testAT()) {
+      return false;
+    }
+    sendAT(GF("&FZE0"));  // Factory + Reset + Echo Off
+    if (waitResponse() != 1) {
+      return false;
+    }
+#ifdef TINY_GSM_DEBUG
+    sendAT(GF("+CMEE=2"));
+    waitResponse();
+#endif
+
+    getSimStatus();
+    return true;
+  }
+
+  String getModemName() {
+    return "Quectel M95";
+  }
+
+  void setBaud(unsigned long baud) {
+    sendAT(GF("+IPR="), baud);
+  }
+
+  bool testAT(unsigned long timeout = 10000L) {
+    for (unsigned long start = millis(); millis() - start < timeout; ) {
+      sendAT(GF(""));
+      if (waitResponse(200) == 1) {
+        delay(100);
+        return true;
+      }
+      delay(100);
+    }
+    return false;
+  }
+
+  void maintain() {
+    for (int mux = 0; mux < TINY_GSM_MUX_COUNT; mux++) {
+      GsmClient* sock = sockets[mux];
+      if (sock && sock->got_data) {
+        sock->got_data = false;
+        sock->sock_available = modemGetAvailable(mux);
+      }
+    }
+    while (stream.available()) {
+      waitResponse(10, NULL, NULL);
+    }
+  }
+
+  bool factoryDefault() {
+    sendAT(GF("&FZE0&W"));  // Factory + Reset + Echo Off + Write
+    waitResponse();
+    sendAT(GF("+IPR=0"));   // Auto-baud
+    waitResponse();
+    sendAT(GF("&W"));       // Write configuration
+    return waitResponse() == 1;
+  }
+
+  String getModemInfo() {
+    sendAT(GF("I"));
+    String res;
+    if (waitResponse(1000L, res) != 1) {
+      return "";
+    }
+    res.replace(GSM_NL "OK" GSM_NL, "");
+    res.replace(GSM_NL, " ");
+    res.trim();
+    return res;
+  }
+
+  bool hasSSL() {
+    return false;  // TODO: For now
+  }
+
+  bool hasWifi() {
+    return false;
+  }
+
+  bool hasGPRS() {
+    return true;
+  }
+
+  /*
+   * Power functions
+   */
+
+  bool restart() {
+    if (!testAT()) {
+      return false;
+    }
+    sendAT(GF("+CFUN=0"));
+    if (waitResponse(10000L, GF("NORMAL POWER DOWN"), GF("OK"), GF("FAIL")) == 3) {
+      return false;
+    }
+    sendAT(GF("+CFUN=1"));
+    if (waitResponse(10000L, GF("Call Ready"), GF("OK"), GF("FAIL")) == 3) {
+      return false;
+    }
+    return init();
+  }
+
+  bool poweroff() {
+    sendAT(GF("+QPOWD"));
+    return waitResponse(GF("POWERED DOWN")) == 1; // TODO
+  }
+
+  bool radioOff() {
+    sendAT(GF("+CFUN=0"));
+    if (waitResponse(10000L) != 1) {
+      return false;
+    }
+    delay(3000);
+    return true;
+  }
+
+  /*
+   * SIM card functions
+   */
+
+  bool simUnlock(const char *pin) {
+    sendAT(GF("+CPIN=\""), pin, GF("\""));
+    return waitResponse() == 1;
+  }
+
+  String getSimCCID() {
+    sendAT(GF("+ICCID"));
+    if (waitResponse(GF(GSM_NL "+ICCID:")) != 1) {
+      return "";
+    }
+    String res = stream.readStringUntil('\n');
+    waitResponse();
+    res.trim();
+    return res;
+  }
+
+  String getIMEI() {
+    sendAT(GF("+GSN"));
+    if (waitResponse(GF(GSM_NL)) != 1) {
+      return "";
+    }
+    String res = stream.readStringUntil('\n');
+    waitResponse();
+    res.trim();
+    return res;
+  }
+
+  SimStatus getSimStatus(unsigned long timeout = 10000L) {
+    for (unsigned long start = millis(); millis() - start < timeout; ) {
+      sendAT(GF("+CPIN?"));
+      if (waitResponse(GF(GSM_NL "+CPIN:")) != 1) {
+        delay(1000);
+        continue;
+      }
+      int status = waitResponse(GF("READY"), GF("SIM PIN"), GF("SIM PUK"));
+      waitResponse();
+      switch (status) {
+        case 2:
+        case 3:  return SIM_LOCKED;
+        case 1:  return SIM_READY;
+        default: return SIM_ERROR;
+      }
+    }
+    return SIM_ERROR;
+  }
+
+  RegStatus getRegistrationStatus() {
+    sendAT(GF("+CREG?"));
+    if (waitResponse(GF(GSM_NL "+CREG:")) != 1) {
+      return REG_UNKNOWN;
+    }
+    streamSkipUntil(','); // Skip format (0)
+    int status = stream.readStringUntil('\n').toInt();
+    waitResponse();
+    return (RegStatus)status;
+  }
+
+  String getOperator() {
+    sendAT(GF("+COPS?"));
+    if (waitResponse(GF(GSM_NL "+COPS:")) != 1) {
+      return "";
+    }
+    streamSkipUntil('"'); // Skip mode and format
+    String res = stream.readStringUntil('"');
+    waitResponse();
+    return res;
+  }
+
+  /*
+   * Generic network functions
+   */
+
+  int getSignalQuality() {
+    sendAT(GF("+CSQ"));
+    if (waitResponse(GF(GSM_NL "+CSQ:")) != 1) {
+      return 99;
+    }
+    int res = stream.readStringUntil(',').toInt();
+    waitResponse();
+    return res;
+  }
+
+  bool isNetworkConnected() {
+    RegStatus s = getRegistrationStatus();
+    return (s == REG_OK_HOME || s == REG_OK_ROAMING);
+  }
+
+  void setHostFormat( bool useDottedQuad ) {
+    if ( useDottedQuad ) {
+      sendAT(GF("+QIDNSIP=0"));
+    } else {
+      sendAT(GF("+QIDNSIP=1"));
+    }
+    waitResponse();
+  }
+
+  /*
+   * GPRS functions
+   */
+  bool gprsConnect(const char* apn, const char* user = NULL, const char* pwd = NULL) {
+    gprsDisconnect();
+
+    // select foreground context 0 = VIRTUAL_UART_1
+    sendAT(GF("+QIFGCNT=0"));
+    if (waitResponse() != 1) {
+      return false;
+    }
+
+    //Select GPRS (=1) as the Bearer
+    sendAT(GF("+QICSGP=1,\""), apn, GF("\",\""), user, GF("\",\""), pwd, GF("\""));
+    if (waitResponse() != 1) {
+      return false;
+    }
+
+    //Start TCPIP Task and Set APN, User Name and Password
+    sendAT("+QIREGAPP=\"", apn, "\",\"", user, "\",\"", pwd,  "\"" );
+    if (waitResponse() != 1) {
+      return false;
+    }
+
+    //Activate GPRS/CSD Context
+    sendAT(GF("+QIACT"));
+    if (waitResponse(10000) != 1) {
+      return false;
+    }
+
+    //Enable multiple TCP/IP connections
+    sendAT(GF("+QIMUX=1"));
+    if (waitResponse() != 1) {
+      return false;
+    }
+
+    //Request an IP header for received data ("IPD(data length):")
+    sendAT(GF("+QIHEAD=1"));
+    if (waitResponse() != 1) {
+      return false;
+    }
+
+    //Set Method to Handle Received TCP/IP Data - Retrieve Data by Command
+    sendAT(GF("+QINDI=1"));
+    if (waitResponse() != 1) {
+      return false;
+    }
+
+    return true;
+  }
+
+  bool gprsDisconnect() {
+    sendAT(GF("+QIDEACT"));
+    return waitResponse(60000L, GF("DEACT OK"), GF("ERROR")) == 1;
+  }
+
+  bool isGprsConnected() {
+    sendAT(GF("+CGATT?"));
+    if (waitResponse(GF(GSM_NL "+CGATT:")) != 1) {
+      return false;
+    }
+    int res = stream.readStringUntil('\n').toInt();
+    waitResponse();
+    if (res != 1)
+      return false;
+
+    return localIP() != 0;
+  }
+
+  /*
+   * IP Address functions
+   */
+
+  String getLocalIP() {
+    sendAT(GF("+QILOCIP"));
+    stream.readStringUntil('\n');
+    String res = stream.readStringUntil('\n');
+    res.trim();
+    return res;
+  }
+
+  /*
+   * Messaging functions
+   */
+
+  String sendUSSD(const String& code) {
+    sendAT(GF("+CMGF=1"));
+    waitResponse();
+    sendAT(GF("+CSCS=\"HEX\""));
+    waitResponse();
+    sendAT(GF("+CUSD=1,\""), code, GF("\""));
+    if (waitResponse(10000L, GF(GSM_NL "+CUSD:")) != 1) {
+      return "";
+    }
+    stream.readStringUntil('"');
+    String hex = stream.readStringUntil('"');
+    stream.readStringUntil(',');
+    int dcs = stream.readStringUntil('\n').toInt();
+
+    if (waitResponse() != 1) {
+      return "";
+    }
+
+    if (dcs == 15) {
+      return TinyGsmDecodeHex8bit(hex);
+    } else if (dcs == 72) {
+      return TinyGsmDecodeHex16bit(hex);
+    } else {
+      return hex;
+    }
+  }
+
+  bool sendSMS(const String& number, const String& text) {
+    sendAT(GF("+CMGF=1"));
+    waitResponse();
+    //Set GSM 7 bit default alphabet (3GPP TS 23.038)
+    sendAT(GF("+CSCS=\"GSM\""));
+    waitResponse();
+    sendAT(GF("+CMGS=\""), number, GF("\""));
+    if (waitResponse(GF(">")) != 1) {
+      return false;
+    }
+    stream.print(text);
+    stream.write((char)0x1A);
+    stream.flush();
+    return waitResponse(60000L) == 1;
+  }
+
+  bool sendSMS_UTF16(const String& number, const void* text, size_t len) {
+    sendAT(GF("+CMGF=1"));
+    waitResponse();
+    sendAT(GF("+CSCS=\"HEX\""));
+    waitResponse();
+    sendAT(GF("+CSMP=17,167,0,8"));
+    waitResponse();
+
+    sendAT(GF("+CMGS=\""), number, GF("\""));
+    if (waitResponse(GF(">")) != 1) {
+      return false;
+    }
+
+    uint16_t* t = (uint16_t*)text;
+    for (size_t i=0; i<len; i++) {
+      uint8_t c = t[i] >> 8;
+      if (c < 0x10) { stream.print('0'); }
+      stream.print(c, HEX);
+      c = t[i] & 0xFF;
+      if (c < 0x10) { stream.print('0'); }
+      stream.print(c, HEX);
+    }
+    stream.write((char)0x1A);
+    stream.flush();
+    return waitResponse(60000L) == 1;
+  }
+
+  /** Delete all SMS */
+  bool deleteAllSMS() {
+    sendAT(GF("+QMGDA=6"));
+    if (waitResponse(waitResponse(60000L, GF("OK"), GF("ERROR")) == 1) ) {
+      return true;
+    }
+    return false;
+  }
+
+  /*
+   * Phone Call functions
+   */
+
+  bool setGsmBusy(bool busy = true) TINY_GSM_ATTR_NOT_AVAILABLE;
+  bool callAnswer() TINY_GSM_ATTR_NOT_AVAILABLE;
+  bool callNumber(const String& number) TINY_GSM_ATTR_NOT_AVAILABLE;
+  bool callHangup() TINY_GSM_ATTR_NOT_AVAILABLE;
+
+  /*
+   * Location functions
+   */
+
+  String getGsmLocation() TINY_GSM_ATTR_NOT_AVAILABLE;
+
+  /*
+   * Battery functions
+   */
+
+  // Use: float vBatt = modem.getBattVoltage() / 1000.0;
+  uint16_t getBattVoltage() {
+    sendAT(GF("+CBC"));
+    if (waitResponse(GF(GSM_NL "+CBC:")) != 1) {
+      return 0;
+    }
+    streamSkipUntil(','); // Skip
+    streamSkipUntil(','); // Skip
+
+    uint16_t res = stream.readStringUntil(',').toInt();
+    waitResponse();
+    return res;
+  }
+
+  int getBattPercent() {
+    sendAT(GF("+CBC"));
+    if (waitResponse(GF(GSM_NL "+CBC:")) != 1) {
+      return false;
+    }
+    stream.readStringUntil(',');
+    int res = stream.readStringUntil(',').toInt();
+    waitResponse();
+    return res;
+  }
+
+  /*
+   * Client related functions
+   */
+
+protected:
+
+  bool modemConnect(const char* host, uint16_t port, uint8_t mux, bool ssl = false) {
+    sendAT(GF("+QIOPEN="), GF("\"TCP"), GF("\",\""), host, GF("\","), port);
+    int rsp = waitResponse(75000L,
+                           GF("CONNECT OK" GSM_NL),
+                           GF("CONNECT FAIL" GSM_NL),
+                           GF("ALREADY CONNECT" GSM_NL));
+    if ( rsp != 1 ) {
+      return false;
+    }
+    return (1 == rsp);
+  }
+
+  int modemSend(const void* buff, size_t len, uint8_t mux) {
+    sendAT(GF("+QISEND="), mux, ',', len);
+    if (waitResponse(GF(">")) != 1) {
+      return 0;
+    }
+    stream.write((uint8_t*)buff, len);
+    stream.flush();
+    if (waitResponse(GF(GSM_NL "SEND OK")) != 1) {
+      return 0;
+    }
+
+    bool allAcknowledged = false;
+    // bool failed = false;
+    while ( !allAcknowledged ) {
+      sendAT( GF("+QISACK"));
+      if (waitResponse(5000L, GF(GSM_NL "+QISACK:")) != 1) {
+        return -1;
+      } else {
+        streamSkipUntil(','); /** Skip total */
+        streamSkipUntil(','); /** Skip acknowledged data size */
+        if ( stream.readStringUntil('\n').toInt() == 0 ) {
+          allAcknowledged = true;
+        }
+      }
+    }
+    waitResponse(5000L);
+
+    // streamSkipUntil(','); // Skip mux
+    // return stream.readStringUntil('\n').toInt();
+    return 1;
+  }
+
+  size_t modemRead(size_t size, uint8_t mux) {
+    sendAT(GF("+QIRD="), mux, ',', size);
+    if (waitResponse(GF("+QIRD:")) != 1) {
+      return 0;
+    }
+    size_t len = stream.readStringUntil('\n').toInt();
+
+    for (size_t i=0; i<len; i++) {
+      while (!stream.available()) { TINY_GSM_YIELD(); }
+      char c = stream.read();
+      sockets[mux]->rx.put(c);
+    }
+    waitResponse();
+    DBG("### READ:", mux, ",", len);
+    return len;
+  }
+
+  size_t modemGetAvailable(uint8_t mux) {
+    sendAT(GF("+QIRD="), mux, GF(",0"));
+    size_t result = 0;
+    if (waitResponse(GF("+QIRD:")) == 1) {
+      streamSkipUntil(','); // Skip total received
+      streamSkipUntil(','); // Skip have read
+      result = stream.readStringUntil('\n').toInt();
+      DBG("### STILL:", mux, "has", result);
+      waitResponse();
+    }
+    if (!result) {
+      sockets[mux]->sock_connected = modemGetConnected(mux);
+    }
+    return result;
+  }
+
+  bool modemGetConnected(uint8_t mux) {
+    sendAT(GF("+QISTATE=1,"), mux);
+    //+QISTATE: 0,"TCP","151.139.237.11",80,5087,4,1,0,0,"uart1"
+
+    if (waitResponse(GF("+QISTATE:")))
+      return false;
+
+    streamSkipUntil(','); // Skip mux
+    streamSkipUntil(','); // Skip socket type
+    streamSkipUntil(','); // Skip remote ip
+    streamSkipUntil(','); // Skip remote port
+    streamSkipUntil(','); // Skip local port
+    int res = stream.readStringUntil(',').toInt(); // socket state
+
+    waitResponse();
+
+    // 0 Initial, 1 Opening, 2 Connected, 3 Listening, 4 Closing
+    return 2 == res;
+  }
+
+public:
+
+  /*
+   Utilities
+   */
+
+  template<typename... Args>
+  void sendAT(Args... cmd) {
+    streamWrite("AT", cmd..., GSM_NL);
+    stream.flush();
+    TINY_GSM_YIELD();
+    //DBG("### AT:", cmd...);
+  }
+
+  // TODO: Optimize this!
+  uint8_t waitResponse(uint32_t timeout, String& data,
+                       GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
+                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
+  {
+    /*String r1s(r1); r1s.trim();
+    String r2s(r2); r2s.trim();
+    String r3s(r3); r3s.trim();
+    String r4s(r4); r4s.trim();
+    String r5s(r5); r5s.trim();
+    DBG("### ..:", r1s, ",", r2s, ",", r3s, ",", r4s, ",", r5s);*/
+    data.reserve(64);
+    int index = 0;
+    unsigned long startMillis = millis();
+    do {
+      TINY_GSM_YIELD();
+      while (stream.available() > 0) {
+        int a = stream.read();
+        if (a <= 0) continue; // Skip 0x00 bytes, just in case
+        data += (char)a;
+        if (r1 && data.endsWith(r1)) {
+          index = 1;
+          goto finish;
+        } else if (r2 && data.endsWith(r2)) {
+          index = 2;
+          goto finish;
+        } else if (r3 && data.endsWith(r3)) {
+          index = 3;
+          goto finish;
+        } else if (r4 && data.endsWith(r4)) {
+          index = 4;
+          goto finish;
+        } else if (r5 && data.endsWith(r5)) {
+          index = 5;
+          goto finish;
+        } else if (data.endsWith(GF(GSM_NL "+QIRD:"))) {
+          streamSkipUntil(',');  // Skip the context
+          streamSkipUntil(',');  // Skip the role
+          int mux = stream.readStringUntil('\n').toInt();
+          DBG("### Got Data:", mux);
+          if (mux >= 0 && mux < TINY_GSM_MUX_COUNT && sockets[mux]) {
+            sockets[mux]->got_data = true;
+          }
+        } else if (data.endsWith(GF("CLOSED" GSM_NL))) {
+          int nl = data.lastIndexOf(GSM_NL, data.length()-8);
+          int coma = data.indexOf(',', nl+2);
+          int mux = data.substring(nl+2, coma).toInt();
+          if (mux >= 0 && mux < TINY_GSM_MUX_COUNT && sockets[mux]) {
+            sockets[mux]->sock_connected = false;
+          }
+          data = "";
+          DBG("### Closed: ", mux);
+        }
+      }
+    } while (millis() - startMillis < timeout);
+finish:
+    if (!index) {
+      data.trim();
+      if (data.length()) {
+        DBG("### Unhandled:", data);
+      }
+      data = "";
+    }
+    //DBG('<', index, '>');
+    return index;
+  }
+
+  uint8_t waitResponse(uint32_t timeout,
+                       GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
+                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
+  {
+    String data;
+    return waitResponse(timeout, data, r1, r2, r3, r4, r5);
+  }
+
+  uint8_t waitResponse(GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
+                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
+  {
+    return waitResponse(1000, r1, r2, r3, r4, r5);
+  }
+
+public:
+  Stream&       stream;
+
+protected:
+  GsmClient*    sockets[TINY_GSM_MUX_COUNT];
+};
+
+#endif

src/TinyGsmClientMC60.h

@@ -0,0 +1,874 @@
+/**
+ * @file       TinyGsmClientMC60.h
+ * @author     Volodymyr Shymanskyy
+ * @license    LGPL-3.0
+ * @copyright  Copyright (c) 2016 Volodymyr Shymanskyy
+ * @date       Nov 2016
+ *
+ * @MC60 support added by Tamas Dajka 2017.10.15 - with fixes by Sara Damiano
+ *
+ */
+
+#ifndef TinyGsmClientMC60_h
+#define TinyGsmClientMC60_h
+
+//#define TINY_GSM_DEBUG Serial
+//#define TINY_GSM_USE_HEX
+
+#if !defined(TINY_GSM_RX_BUFFER)
+  #define TINY_GSM_RX_BUFFER 64
+#endif
+
+#define TINY_GSM_MUX_COUNT 6
+
+#include <TinyGsmCommon.h>
+
+#define GSM_NL "\r\n"
+static const char GSM_OK[] TINY_GSM_PROGMEM = "OK" GSM_NL;
+static const char GSM_ERROR[] TINY_GSM_PROGMEM = "ERROR" GSM_NL;
+
+enum SimStatus {
+  SIM_ERROR = 0,
+  SIM_READY = 1,
+  SIM_LOCKED = 2,
+  SIM_ANTITHEFT_LOCKED = 3,
+};
+
+enum RegStatus {
+  REG_UNREGISTERED = 0,
+  REG_SEARCHING    = 2,
+  REG_DENIED       = 3,
+  REG_OK_HOME      = 1,
+  REG_OK_ROAMING   = 5,
+  REG_UNKNOWN      = 4,
+};
+
+
+class TinyGsmMC60 : public TinyGsmModem
+{
+
+public:
+
+class GsmClient : public Client
+{
+  friend class TinyGsmMC60;
+  typedef TinyGsmFifo<uint8_t, TINY_GSM_RX_BUFFER> RxFifo;
+
+public:
+  GsmClient() {}
+
+  GsmClient(TinyGsmMC60& modem, uint8_t mux = 1) {
+    init(&modem, mux);
+  }
+
+  bool init(TinyGsmMC60* modem, uint8_t mux = 1) {
+    this->at = modem;
+    this->mux = mux;
+    sock_available = 0;
+    sock_connected = false;
+    got_data = false;
+
+    at->sockets[mux] = this;
+
+    return true;
+  }
+
+public:
+  virtual int connect(const char *host, uint16_t port) {
+    stop();
+    TINY_GSM_YIELD();
+    rx.clear();
+    sock_connected = at->modemConnect(host, port, mux);
+    return sock_connected;
+  }
+
+  virtual int connect(IPAddress ip, uint16_t port) {
+    String host; host.reserve(16);
+    host += ip[0];
+    host += ".";
+    host += ip[1];
+    host += ".";
+    host += ip[2];
+    host += ".";
+    host += ip[3];
+    return connect(host.c_str(), port);
+  }
+
+  virtual void stop() {
+    TINY_GSM_YIELD();
+    at->sendAT(GF("+QICLOSE="), mux);
+    sock_connected = false;
+    at->waitResponse(60000L, GF("CLOSED"), GF("CLOSE OK"), GF("ERROR"));
+    rx.clear();
+  }
+
+  virtual size_t write(const uint8_t *buf, size_t size) {
+    TINY_GSM_YIELD();
+    at->maintain();
+    return at->modemSend(buf, size, mux);
+  }
+
+  virtual size_t write(uint8_t c) {
+    return write(&c, 1);
+  }
+
+  virtual size_t write(const char *str) {
+    if (str == NULL) return 0;
+    return write((const uint8_t *)str, strlen(str));
+  }
+
+  virtual int available() {
+    TINY_GSM_YIELD();
+    if (!rx.size() && sock_connected) {
+      at->maintain();
+    }
+    return rx.size() + sock_available;
+  }
+
+  virtual int read(uint8_t *buf, size_t size) {
+    TINY_GSM_YIELD();
+    at->maintain();
+    size_t cnt = 0;
+    while (cnt < size && sock_connected) {
+      size_t chunk = TinyGsmMin(size-cnt, rx.size());
+      if (chunk > 0) {
+        rx.get(buf, chunk);
+        buf += chunk;
+        cnt += chunk;
+        continue;
+      }
+      // TODO: Read directly into user buffer?
+      at->maintain();
+      if (sock_available > 0) {
+        at->modemRead(rx.free(), mux);
+      } else {
+        break;
+      }
+    }
+    return cnt;
+  }
+
+  virtual int read() {
+    uint8_t c;
+    if (read(&c, 1) == 1) {
+      return c;
+    }
+    return -1;
+  }
+
+  virtual int peek() { return -1; } //TODO
+  virtual void flush() { at->stream.flush(); }
+
+  virtual uint8_t connected() {
+    if (available()) {
+      return true;
+    }
+    return sock_connected;
+  }
+  virtual operator bool() { return connected(); }
+
+  /*
+   * Extended API
+   */
+
+  String remoteIP() TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
+private:
+  TinyGsmMC60*  at;
+  uint8_t       mux;
+  uint16_t      sock_available;
+  bool          sock_connected;
+  bool          got_data;
+  RxFifo        rx;
+};
+
+
+// class GsmClientSecure : public GsmClient
+// {
+// public:
+//   GsmClientSecure() {}
+//
+//   GsmClientSecure(TinyGsmMC60& modem, uint8_t mux = 1)
+//     : GsmClient(modem, mux)
+//   {}
+//
+// public:
+//   virtual int connect(const char *host, uint16_t port) {
+//     stop();
+//     TINY_GSM_YIELD();
+//     rx.clear();
+//     sock_connected = at->modemConnect(host, port, mux, true);
+//     return sock_connected;
+//   }
+// };
+
+
+public:
+
+  TinyGsmMC60(Stream& stream)
+    : TinyGsmModem(stream), stream(stream)
+  {
+    memset(sockets, 0, sizeof(sockets));
+  }
+
+  /*
+   * Basic functions
+   */
+
+  bool init(const char* pin = NULL) {
+    if (!testAT()) {
+      return false;
+    }
+    sendAT(GF("&FZ"));  // Factory + Reset
+    waitResponse();
+    sendAT(GF("E0"));   // Echo Off
+    if (waitResponse() != 1) {
+      return false;
+    }
+    getSimStatus();
+    return true;
+  }
+
+  String getModemName() {
+    #if defined(TINY_GSM_MODEM_MC60)
+      return "Quectel MC60";
+    #elif defined(TINY_GSM_MODEM_MC60E)
+      return "Quectel MC60E";
+    #endif
+      return "Quectel MC60";
+  }
+
+  void setBaud(unsigned long baud) {
+    sendAT(GF("+IPR="), baud);
+  }
+
+  bool testAT(unsigned long timeout = 10000L) {
+    for (unsigned long start = millis(); millis() - start < timeout; ) {
+      sendAT(GF(""));
+      if (waitResponse(200) == 1) {
+        delay(100);
+        return true;
+      }
+      delay(100);
+    }
+    return false;
+  }
+
+  void maintain() {
+    for (int mux = 0; mux < TINY_GSM_MUX_COUNT; mux++) {
+      GsmClient* sock = sockets[mux];
+      if (sock && sock->got_data) {
+        sock->got_data = false;
+        sock->sock_available = modemGetAvailable(mux);
+      }
+    }
+    while (stream.available()) {
+      waitResponse(10, NULL, NULL);
+    }
+  }
+
+  bool factoryDefault() {
+    sendAT(GF("&FZE0&W"));  // Factory + Reset + Echo Off + Write
+    waitResponse();
+    sendAT(GF("+IPR=0"));   // Auto-baud
+    waitResponse();
+    sendAT(GF("&W"));       // Write configuration
+    return waitResponse() == 1;
+  }
+
+  String getModemInfo() {
+    sendAT(GF("I"));
+    String res;
+    if (waitResponse(1000L, res) != 1) {
+      return "";
+    }
+    res.replace(GSM_NL "OK" GSM_NL, "");
+    res.replace(GSM_NL, " ");
+    res.trim();
+    return res;
+  }
+
+  /*
+  * under development
+  */
+  // bool hasSSL() {
+  //   sendAT(GF("+QIPSSL=?"));
+  //   if (waitResponse(GF(GSM_NL "+CIPSSL:")) != 1) {
+  //     return false;
+  //   }
+  //   return waitResponse() == 1;
+  // }
+
+  bool hasSSL() {
+    return false;  // TODO: For now
+  }
+
+  bool hasWifi() {
+    return false;
+  }
+
+  bool hasGPRS() {
+    return true;
+  }
+
+  /*
+   * Power functions
+   */
+
+  bool restart() {
+    if (!testAT()) {
+      return false;
+    }
+    sendAT(GF("+CFUN=0"));
+    if (waitResponse(10000L) != 1) {
+      return false;
+    }
+    sendAT(GF("+CFUN=1,1"));
+    if (waitResponse(10000L) != 1) {
+      return false;
+    }
+    delay(3000);
+    return init();
+  }
+
+  bool poweroff() {
+    sendAT(GF("+QPOWD=1"));
+    return waitResponse(GF("NORMAL POWER DOWN")) == 1;
+  }
+
+  bool radioOff() {
+    if (!testAT()) {
+      return false;
+    }
+    sendAT(GF("+CFUN=0"));
+    if (waitResponse(10000L) != 1) {
+      return false;
+    }
+    delay(3000);
+    return true;
+  }
+
+  /*
+   * SIM card functions
+   */
+
+  bool simUnlock(const char *pin) {
+    sendAT(GF("+CPIN=\""), pin, GF("\""));
+    return waitResponse() == 1;
+  }
+
+  String getSimCCID() {
+    sendAT(GF("+ICCID"));
+    if (waitResponse(GF(GSM_NL "+ICCID:")) != 1) {
+      return "";
+    }
+    String res = stream.readStringUntil('\n');
+    waitResponse();
+    res.trim();
+    return res;
+  }
+
+  String getIMEI() {
+    sendAT(GF("+GSN"));
+    if (waitResponse(GF(GSM_NL)) != 1) {
+      return "";
+    }
+    String res = stream.readStringUntil('\n');
+    waitResponse();
+    res.trim();
+    return res;
+  }
+
+  SimStatus getSimStatus(unsigned long timeout = 10000L) {
+    for (unsigned long start = millis(); millis() - start < timeout; ) {
+      sendAT(GF("+CPIN?"));
+      if (waitResponse(GF(GSM_NL "+CPIN:")) != 1) {
+        delay(1000);
+        continue;
+      }
+      int status = waitResponse(GF("READY"), GF("SIM PIN"), GF("SIM PUK"), GF("NOT INSERTED"), GF("PH_SIM PIN"), GF("PH_SIM PUK"));
+      waitResponse();
+      switch (status) {
+        case 2:
+        case 3:  return SIM_LOCKED;
+        case 5:
+        case 6:  return SIM_ANTITHEFT_LOCKED;
+        case 1:  return SIM_READY;
+        default: return SIM_ERROR;
+      }
+    }
+    return SIM_ERROR;
+  }
+
+  RegStatus getRegistrationStatus() {
+    sendAT(GF("+CREG?"));
+    if (waitResponse(GF(GSM_NL "+CREG:")) != 1) {
+      return REG_UNKNOWN;
+    }
+    streamSkipUntil(','); // Skip format (0)
+    int status = stream.readStringUntil('\n').toInt();
+    waitResponse();
+    return (RegStatus)status;
+  }
+
+  String getOperator() {
+    sendAT(GF("+COPS?"));
+    if (waitResponse(GF(GSM_NL "+COPS:")) != 1) {
+      return "";
+    }
+    streamSkipUntil('"'); // Skip mode and format
+    String res = stream.readStringUntil('"');
+    waitResponse();
+    return res;
+  }
+
+  /*
+   * Generic network functions
+   */
+
+  int getSignalQuality() {
+    sendAT(GF("+CSQ"));
+    if (waitResponse(GF(GSM_NL "+CSQ:")) != 1) {
+      return 99;
+    }
+    int res = stream.readStringUntil(',').toInt();
+    waitResponse();
+    return res;
+  }
+
+  bool isNetworkConnected() {
+    RegStatus s = getRegistrationStatus();
+    return (s == REG_OK_HOME || s == REG_OK_ROAMING);
+  }
+
+  /*
+   * GPRS functions
+   */
+  bool gprsConnect(const char* apn, const char* user = NULL, const char* pwd = NULL) {
+    gprsDisconnect();
+
+    // select foreground context 0 = VIRTUAL_UART_1
+    sendAT(GF("+QIFGCNT=0"));
+    if (waitResponse() != 1) {
+      return false;
+    }
+
+    //Select GPRS (=1) as the Bearer
+    sendAT(GF("+QICSGP=1,\""), apn, GF("\",\""), user, GF("\",\""), pwd, GF("\""));
+    if (waitResponse() != 1) {
+      return false;
+    }
+
+    //Define PDP context - is this necessary?
+    sendAT(GF("+CGDCONT=1,\"IP\",\""), apn, '"');
+    waitResponse();
+
+    // Activate PDP context - is this necessary?
+    sendAT(GF("+CGACT=1,1"));
+    waitResponse(60000L);
+
+    //Start TCPIP Task and Set APN, User Name and Password
+    sendAT("+QIREGAPP=\"", apn, "\",\"", user, "\",\"", pwd,  "\"" );
+    if (waitResponse() != 1) {
+      return false;
+    }
+
+    //Activate GPRS/CSD Context
+    sendAT(GF("+QIACT"));
+    if (waitResponse(60000L) != 1) {
+      return false;
+    }
+
+    //Enable multiple TCP/IP connections
+    sendAT(GF("+QIMUX=1"));
+    if (waitResponse() != 1) {
+      return false;
+    }
+
+    //Request an IP header for received data ("IPD(data length):")
+    sendAT(GF("+QIHEAD=1"));
+    if (waitResponse() != 1) {
+      return false;
+    }
+
+    //Set Method to Handle Received TCP/IP Data - Retrieve Data by Command
+    sendAT(GF("+QINDI=1"));
+    if (waitResponse() != 1) {
+      return false;
+    }
+
+    // Check that we have a local IP address
+    if (localIP() != 0) {
+      return true;
+    }
+
+    return false;
+  }
+
+  bool gprsDisconnect() {
+    sendAT(GF("+QIDEACT"));
+    return waitResponse(60000L, GF("DEACT OK"), GF("ERROR")) == 1;
+  }
+
+  bool isGprsConnected() {
+    sendAT(GF("+CGATT?"));
+    if (waitResponse(GF(GSM_NL "+CGATT:")) != 1) {
+      return false;
+    }
+    int res = stream.readStringUntil('\n').toInt();
+    waitResponse();
+    if (res != 1)
+      return false;
+
+    return localIP() != 0;
+  }
+
+  /*
+   * IP Address functions
+   */
+
+  String getLocalIP() {
+    sendAT(GF("+QILOCIP"));
+    stream.readStringUntil('\n');
+    String res = stream.readStringUntil('\n');
+    res.trim();
+    return res;
+  }
+
+  /*
+   * Messaging functions
+   */
+
+  String sendUSSD(const String& code) {
+    sendAT(GF("+CMGF=1"));
+    waitResponse();
+    sendAT(GF("+CSCS=\"HEX\""));
+    waitResponse();
+    sendAT(GF("+CUSD=1,\""), code, GF("\""));
+    if (waitResponse(10000L, GF(GSM_NL "+CUSD:")) != 1) {
+      return "";
+    }
+    stream.readStringUntil('"');
+    String hex = stream.readStringUntil('"');
+    stream.readStringUntil(',');
+    int dcs = stream.readStringUntil('\n').toInt();
+
+    if (waitResponse() != 1) {
+      return "";
+    }
+
+    if (dcs == 15) {
+      return TinyGsmDecodeHex8bit(hex);
+    } else if (dcs == 72) {
+      return TinyGsmDecodeHex16bit(hex);
+    } else {
+      return hex;
+    }
+  }
+
+  bool sendSMS(const String& number, const String& text) {
+    sendAT(GF("+CMGF=1"));
+    waitResponse();
+    //Set GSM 7 bit default alphabet (3GPP TS 23.038)
+    sendAT(GF("+CSCS=\"GSM\""));
+    waitResponse();
+    sendAT(GF("+CMGS=\""), number, GF("\""));
+    if (waitResponse(GF(">")) != 1) {
+      return false;
+    }
+    stream.print(text);
+    stream.write((char)0x1A);
+    stream.flush();
+    return waitResponse(60000L) == 1;
+  }
+
+  bool sendSMS_UTF16(const String& number, const void* text, size_t len) {
+    sendAT(GF("+CMGF=1"));
+    waitResponse();
+    sendAT(GF("+CSCS=\"HEX\""));
+    waitResponse();
+    sendAT(GF("+CSMP=17,167,0,8"));
+    waitResponse();
+
+    sendAT(GF("+CMGS=\""), number, GF("\""));
+    if (waitResponse(GF(">")) != 1) {
+      return false;
+    }
+
+    uint16_t* t = (uint16_t*)text;
+    for (size_t i=0; i<len; i++) {
+      uint8_t c = t[i] >> 8;
+      if (c < 0x10) { stream.print('0'); }
+      stream.print(c, HEX);
+      c = t[i] & 0xFF;
+      if (c < 0x10) { stream.print('0'); }
+      stream.print(c, HEX);
+    }
+    stream.write((char)0x1A);
+    stream.flush();
+    return waitResponse(60000L) == 1;
+  }
+
+  /** Delete all SMS */
+  bool deleteAllSMS() {
+    sendAT(GF("+QMGDA=6"));
+    if (waitResponse(waitResponse(60000L, GF("OK"), GF("ERROR")) == 1) ) {
+      return true;
+    }
+    return false;
+  }
+
+  /*
+   * Location functions
+   */
+
+  String getGsmLocation() {
+    sendAT(GF("+CIPGSMLOC=1,1"));
+    if (waitResponse(10000L, GF(GSM_NL "+CIPGSMLOC:")) != 1) {
+      return "";
+    }
+    String res = stream.readStringUntil('\n');
+    waitResponse();
+    res.trim();
+    return res;
+  }
+
+  /*
+   * Battery functions
+   */
+
+  // Use: float vBatt = modem.getBattVoltage() / 1000.0;
+  uint16_t getBattVoltage() {
+    sendAT(GF("+CBC"));
+    if (waitResponse(GF(GSM_NL "+CBC:")) != 1) {
+      return 0;
+    }
+    streamSkipUntil(','); // Skip
+    streamSkipUntil(','); // Skip
+
+    uint16_t res = stream.readStringUntil(',').toInt();
+    waitResponse();
+    return res;
+  }
+
+  int getBattPercent() {
+    sendAT(GF("+CBC"));
+    if (waitResponse(GF(GSM_NL "+CBC:")) != 1) {
+      return false;
+    }
+    stream.readStringUntil(',');
+    int res = stream.readStringUntil(',').toInt();
+    waitResponse();
+    return res;
+  }
+
+  /*
+   * Client related functions
+   */
+
+protected:
+
+  bool modemConnect(const char* host, uint16_t port, uint8_t mux, bool ssl = false) {
+    sendAT(GF("+QIOPEN="), GF("\"TCP"), GF("\",\""), host, GF("\","), port);
+    int rsp = waitResponse(75000L,
+                           GF("CONNECT OK" GSM_NL),
+                           GF("CONNECT FAIL" GSM_NL),
+                           GF("ALREADY CONNECT" GSM_NL));
+    if ( rsp != 1 ) {
+      return false;
+    }
+    return (1 == rsp);
+  }
+
+  int modemSend(const void* buff, size_t len, uint8_t mux) {
+    sendAT(GF("+QISEND="), mux, ',', len);
+    if (waitResponse(GF(">")) != 1) {
+      return 0;
+    }
+    stream.write((uint8_t*)buff, len);
+    stream.flush();
+    if (waitResponse(GF(GSM_NL "SEND OK")) != 1) {
+      return 0;
+    }
+
+    bool allAcknowledged = false;
+    // bool failed = false;
+    while ( !allAcknowledged ) {
+      sendAT( GF("+QISACK"));
+      if (waitResponse(5000L, GF(GSM_NL "+QISACK:")) != 1) {
+        return -1;
+      } else {
+        streamSkipUntil(','); /** Skip total */
+        streamSkipUntil(','); /** Skip acknowledged data size */
+        if ( stream.readStringUntil('\n').toInt() == 0 ) {
+          allAcknowledged = true;
+        }
+      }
+    }
+    waitResponse(5000L);
+
+    // streamSkipUntil(','); // Skip mux
+    // return stream.readStringUntil('\n').toInt();
+    return 1;
+  }
+
+  size_t modemRead(size_t size, uint8_t mux) {
+    sendAT(GF("+QIRD="), mux, ',', size);
+    if (waitResponse(GF("+QIRD:")) != 1) {
+      return 0;
+    }
+    size_t len = stream.readStringUntil('\n').toInt();
+
+    for (size_t i=0; i<len; i++) {
+      while (!stream.available()) { TINY_GSM_YIELD(); }
+      char c = stream.read();
+      sockets[mux]->rx.put(c);
+    }
+    waitResponse();
+    DBG("### READ:", mux, ",", len);
+    return len;
+  }
+
+  size_t modemGetAvailable(uint8_t mux) {
+    sendAT(GF("+QIRD="), mux, GF(",0"));
+    size_t result = 0;
+    if (waitResponse(GF("+QIRD:")) == 1) {
+      streamSkipUntil(','); // Skip total received
+      streamSkipUntil(','); // Skip have read
+      result = stream.readStringUntil('\n').toInt();
+      DBG("### STILL:", mux, "has", result);
+      waitResponse();
+    }
+    if (!result) {
+      sockets[mux]->sock_connected = modemGetConnected(mux);
+    }
+    return result;
+  }
+
+  bool modemGetConnected(uint8_t mux) {
+    sendAT(GF("+QISTATE=1,"), mux);
+    //+QISTATE: 0,"TCP","151.139.237.11",80,5087,4,1,0,0,"uart1"
+
+    if (waitResponse(GF("+QISTATE:")))
+      return false;
+
+    streamSkipUntil(','); // Skip mux
+    streamSkipUntil(','); // Skip socket type
+    streamSkipUntil(','); // Skip remote ip
+    streamSkipUntil(','); // Skip remote port
+    streamSkipUntil(','); // Skip local port
+    int res = stream.readStringUntil(',').toInt(); // socket state
+
+    waitResponse();
+
+    // 0 Initial, 1 Opening, 2 Connected, 3 Listening, 4 Closing
+    return 2 == res;
+  }
+
+public:
+
+  /*
+   Utilities
+   */
+
+  template<typename... Args>
+  void sendAT(Args... cmd) {
+    streamWrite("AT", cmd..., GSM_NL);
+    stream.flush();
+    TINY_GSM_YIELD();
+    //DBG("### AT:", cmd...);
+  }
+
+  // TODO: Optimize this!
+  uint8_t waitResponse(uint32_t timeout, String& data,
+                       GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
+                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL, GsmConstStr r6=NULL)
+  {
+    /*String r1s(r1); r1s.trim();
+    String r2s(r2); r2s.trim();
+    String r3s(r3); r3s.trim();
+    String r4s(r4); r4s.trim();
+    String r5s(r5); r5s.trim();
+    String r6s(r6); r6s.trim();
+    DBG("### ..:", r1s, ",", r2s, ",", r3s, ",", r4s, ",", r5s, ",", r6s);*/
+    data.reserve(64);
+    int index = 0;
+    unsigned long startMillis = millis();
+    do {
+      TINY_GSM_YIELD();
+      while (stream.available() > 0) {
+        int a = stream.read();
+        if (a <= 0) continue; // Skip 0x00 bytes, just in case
+        data += (char)a;
+        if (r1 && data.endsWith(r1)) {
+          index = 1;
+          goto finish;
+        } else if (r2 && data.endsWith(r2)) {
+          index = 2;
+          goto finish;
+        } else if (r3 && data.endsWith(r3)) {
+          index = 3;
+          goto finish;
+        } else if (r4 && data.endsWith(r4)) {
+          index = 4;
+          goto finish;
+        } else if (r5 && data.endsWith(r5)) {
+          index = 5;
+          goto finish;
+        } else if (r6 && data.endsWith(r6)) {
+          index = 6;
+          goto finish;
+        } else if (data.endsWith(GF(GSM_NL "+QIRD:"))) {
+          streamSkipUntil(',');  // Skip the context
+          streamSkipUntil(',');  // Skip the role
+          int mux = stream.readStringUntil('\n').toInt();
+          DBG("### Got Data:", mux);
+          if (mux >= 0 && mux < TINY_GSM_MUX_COUNT && sockets[mux]) {
+            sockets[mux]->got_data = true;
+          }
+        } else if (data.endsWith(GF("CLOSED" GSM_NL))) {
+          int nl = data.lastIndexOf(GSM_NL, data.length()-8);
+          int coma = data.indexOf(',', nl+2);
+          int mux = data.substring(nl+2, coma).toInt();
+          if (mux >= 0 && mux < TINY_GSM_MUX_COUNT && sockets[mux]) {
+            sockets[mux]->sock_connected = false;
+          }
+          data = "";
+          DBG("### Closed: ", mux);
+        }
+      }
+    } while (millis() - startMillis < timeout);
+finish:
+    if (!index) {
+      data.trim();
+      if (data.length()) {
+        DBG("### Unhandled:", data);
+      }
+      data = "";
+    }
+    //DBG('<', index, '>');
+    return index;
+  }
+
+  uint8_t waitResponse(uint32_t timeout,
+                       GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
+                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL, GsmConstStr r6=NULL)
+  {
+    String data;
+    return waitResponse(timeout, data, r1, r2, r3, r4, r5, r6);
+  }
+
+  uint8_t waitResponse(GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
+                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL, GsmConstStr r6=NULL)
+  {
+    return waitResponse(1000, r1, r2, r3, r4, r5, r6);
+  }
+
+public:
+  Stream&       stream;
+
+protected:
+  GsmClient*    sockets[TINY_GSM_MUX_COUNT];
+};
+
+#endif

src/TinyGsmClientSIM800.h

@@ -45,8 +45,7 @@ enum TinyGSMDateTimeFormat {
   DATE_DATE = 2
 };
 
-
-class TinyGsmSim800
+class TinyGsmSim800 : public TinyGsmModem
 {
 
 public:
@@ -217,7 +216,7 @@ public:
 public:
 
   TinyGsmSim800(Stream& stream)
-    : stream(stream)
+    : TinyGsmModem(stream), stream(stream)
   {
     memset(sockets, 0, sizeof(sockets));
   }
@@ -225,11 +224,8 @@ public:
   /*
    * Basic functions
    */
-  bool begin() {
-    return init();
-  }
 
-  bool init() {
+  bool init(const char* pin = NULL) {
     if (!testAT()) {
       return false;
     }
@@ -243,6 +239,19 @@ public:
     return true;
   }
 
+  String getModemName() {
+    #if defined(TINY_GSM_MODEM_SIM800)
+      return "SIMCom SIM800";
+    #elif defined(TINY_GSM_MODEM_SIM808)
+      return "SIMCom SIM808";
+    #elif defined(TINY_GSM_MODEM_SIM868)
+      return "SIMCom SIM868";
+    #elif defined(TINY_GSM_MODEM_SIM900)
+      return "SIMCom SIM900";
+    #endif
+    return "SIMCom SIM800";
+  }
+
   void setBaud(unsigned long baud) {
     sendAT(GF("+IPR="), baud);
   }
@@ -312,6 +321,14 @@ public:
 #endif
   }
 
+  bool hasWifi() {
+    return false;
+  }
+
+  bool hasGPRS() {
+    return true;
+  }
+
   /*
    * Power functions
    */
@@ -455,22 +472,6 @@ public:
     return (s == REG_OK_HOME || s == REG_OK_ROAMING);
   }
 
-  bool waitForNetwork(unsigned long timeout = 60000L) {
-    for (unsigned long start = millis(); millis() - start < timeout; ) {
-      if (isNetworkConnected()) {
-        return true;
-      }
-      delay(250);
-    }
-    return false;
-  }
-
-  /*
-   * WiFi functions
-   */
-  bool networkConnect(const char* ssid, const char* pwd) TINY_GSM_ATTR_NOT_AVAILABLE;
-  bool networkDisconnect() TINY_GSM_ATTR_NOT_AVAILABLE;
-
   /*
    * GPRS functions
    */
@@ -591,6 +592,10 @@ public:
     return true;
   }
 
+  /*
+   * IP Address functions
+   */
+
   String getLocalIP() {
     sendAT(GF("+CIFSR;E0"));
     String res;
@@ -603,9 +608,6 @@ public:
     return res;
   }
 
-  IPAddress localIP() {
-    return TinyGsmIpFromString(getLocalIP());
-  }
 
   /*
    * Phone Call functions
@@ -800,6 +802,10 @@ public:
     return res;
   }
 
+  /*
+   * Client related functions
+   */
+
 protected:
 
   bool modemConnect(const char* host, uint16_t port, uint8_t mux, bool ssl = false) {
@@ -894,30 +900,9 @@ protected:
 
 public:
 
-  /* Utilities */
-
-  template<typename T>
-  void streamWrite(T last) {
-    stream.print(last);
-  }
-
-  template<typename T, typename... Args>
-  void streamWrite(T head, Args... tail) {
-    stream.print(head);
-    streamWrite(tail...);
-  }
-
-  bool streamSkipUntil(const char c, const unsigned long timeout = 3000L) {
-    unsigned long startMillis = millis();
-    while (millis() - startMillis < timeout) {
-      while (millis() - startMillis < timeout && !stream.available()) {
-        TINY_GSM_YIELD();
-      }
-      if (stream.read() == c)
-        return true;
-    }
-    return false;
-  }
+  /*
+   Utilities
+   */
 
   template<typename... Args>
   void sendAT(Args... cmd) {

src/TinyGsmClientSIM808.h

@@ -27,7 +27,7 @@ public:
 
   // enable GPS
   bool enableGPS() {
-    uint16_t state;
+    // uint16_t state;
 
     sendAT(GF("+CGNSPWR=1"));
     if (waitResponse() != 1) {
@@ -38,7 +38,7 @@ public:
   }
 
   bool disableGPS() {
-    uint16_t state;
+    // uint16_t state;
 
     sendAT(GF("+CGNSPWR=0"));
     if (waitResponse() != 1) {
@@ -65,7 +65,7 @@ public:
   // works only with ans SIM808 V2
   bool getGPS(float *lat, float *lon, float *speed=0, int *alt=0, int *vsat=0, int *usat=0) {
     //String buffer = "";
-    char chr_buffer[12];
+    // char chr_buffer[12];
     bool fix = false;
 
     sendAT(GF("+CGNSINF"));

src/TinyGsmClientUBLOX.h

@@ -40,7 +40,7 @@ enum RegStatus {
 };
 
 
-class TinyGsmUBLOX
+class TinyGsmUBLOX : public TinyGsmModem
 {
 
 public:
@@ -123,7 +123,7 @@ public:
     TINY_GSM_YIELD();
     at->maintain();
     size_t cnt = 0;
-    while (cnt < size) {
+    while (cnt < size && sock_connected) {
       size_t chunk = TinyGsmMin(size-cnt, rx.size());
       if (chunk > 0) {
         rx.get(buf, chunk);
@@ -201,7 +201,7 @@ public:
 public:
 
   TinyGsmUBLOX(Stream& stream)
-    : stream(stream)
+    : TinyGsmModem(stream), stream(stream)
   {
     memset(sockets, 0, sizeof(sockets));
   }
@@ -209,9 +209,6 @@ public:
   /*
    * Basic functions
    */
-  bool begin(const char* pin = NULL) {
-    return init(pin);
-  }
 
   bool init(const char* pin = NULL) {
     if (!testAT()) {
@@ -228,6 +225,10 @@ public:
     return (getSimStatus() == SIM_READY);
   }
 
+  String getModemName() {
+    return "u-blox Cellular Modem";
+  }
+
   void setBaud(unsigned long baud) {
     sendAT(GF("+IPR="), baud);
   }
@@ -280,6 +281,14 @@ public:
     return true;
   }
 
+  bool hasWifi() {
+    return false;
+  }
+
+  bool hasGPRS() {
+    return true;
+  }
+
   /*
    * Power functions
    */
@@ -400,22 +409,6 @@ public:
     return (s == REG_OK_HOME || s == REG_OK_ROAMING);
   }
 
-  bool waitForNetwork(unsigned long timeout = 60000L) {
-    for (unsigned long start = millis(); millis() - start < timeout; ) {
-      if (isNetworkConnected()) {
-        return true;
-      }
-      delay(250);
-    }
-    return false;
-  }
-
-  /*
-   * WiFi functions
-   */
-  bool networkConnect(const char* ssid, const char* pwd) TINY_GSM_ATTR_NOT_AVAILABLE;
-  bool networkDisconnect() TINY_GSM_ATTR_NOT_AVAILABLE;
-
   /*
    * GPRS functions
    */
@@ -481,6 +474,10 @@ public:
     return localIP() != 0;
   }
 
+  /*
+   * IP Address functions
+   */
+
   String getLocalIP() {
     sendAT(GF("+UPSND=0,0"));
     if (waitResponse(GF(GSM_NL "+UPSND:")) != 1) {
@@ -495,10 +492,6 @@ public:
     return res;
   }
 
-  IPAddress localIP() {
-    return TinyGsmIpFromString(getLocalIP());
-  }
-
   /*
    * Phone Call functions
    */
@@ -566,6 +559,10 @@ public:
     return res;
   }
 
+  /*
+   * Client related functions
+   */
+
 protected:
 
   bool modemConnect(const char* host, uint16_t port, uint8_t* mux, bool ssl = false) {
@@ -659,30 +656,9 @@ protected:
 
 public:
 
-  /* Utilities */
-
-  template<typename T>
-  void streamWrite(T last) {
-    stream.print(last);
-  }
-
-  template<typename T, typename... Args>
-  void streamWrite(T head, Args... tail) {
-    stream.print(head);
-    streamWrite(tail...);
-  }
-
-  bool streamSkipUntil(char c, const unsigned long timeout = 1000L) {
-    unsigned long startMillis = millis();
-    while (millis() - startMillis < timeout) {
-      while (millis() - startMillis < timeout && !stream.available()) {
-        TINY_GSM_YIELD();
-      }
-      if (stream.read() == c)
-        return true;
-    }
-    return false;
-  }
+  /*
+   Utilities
+   */
 
   template<typename... Args>
   void sendAT(Args... cmd) {

src/TinyGsmClientXBee.h

@@ -45,7 +45,7 @@ enum XBeeType {
 };
 
 
-class TinyGsmXBee
+class TinyGsmXBee : public TinyGsmModem
 {
 
 public:
@@ -207,17 +207,14 @@ public:
 public:
 
   TinyGsmXBee(Stream& stream)
-    : stream(stream)
+    : TinyGsmModem(stream), stream(stream)
   {}
 
   /*
    * Basic functions
    */
-  bool begin() {
-    return init();
-  }
 
-  bool init() {
+  bool init(const char* pin = NULL) {
     guardTime = 1100;  // Start with a default guard time of 1 second
 
     if (!commandMode(10)) return false;  // Try up to 10 times for the init
@@ -242,6 +239,10 @@ public:
     return ret_val;
   }
 
+  String getModemName() {
+    return getBeeName();
+  }
+
   void setBaud(unsigned long baud) {
     if (!commandMode()) return;
     switch(baud)
@@ -309,6 +310,16 @@ public:
     else return true;
   }
 
+  bool hasWifi() {
+    if (beeType == XBEE_S6B_WIFI) return true;
+    else return false;
+  }
+
+  bool hasGPRS() {
+    if (beeType == XBEE_S6B_WIFI) return false;
+    else return true;
+  }
+
   XBeeType getBeeType() {
     return beeType;
   }
@@ -321,6 +332,7 @@ public:
       case XBEE3_LTE1_ATT: return "Digi XBee3™ Cellular LTE CAT 1";
       case XBEE3_LTEM_ATT: return "Digi XBee3™ Cellular LTE-M";
       case XBEE3_LTENB: return "Digi XBee3™ Cellular NB-IoT";
+      default:  return "Digi XBee®";
     }
   }
 
@@ -555,6 +567,10 @@ fail:
     return res;
   }
 
+  /*
+   * IP Address functions
+   */
+
   String getLocalIP() {
     if (!commandMode()) return "";  // Return immediately
     sendAT(GF("MY"));
@@ -566,10 +582,6 @@ fail:
     return IPaddr;
   }
 
-  IPAddress localIP() {
-    return TinyGsmIpFromString(getLocalIP());
-  }
-
   /*
    * GPRS functions
    */
@@ -639,6 +651,10 @@ fail:
 
   int getBattPercent() TINY_GSM_ATTR_NOT_AVAILABLE;
 
+  /*
+   * Client related functions
+   */
+
 protected:
 
   bool modemConnect(const char* host, uint16_t port, uint8_t mux = 0, bool ssl = false) {
@@ -704,63 +720,15 @@ protected:
 
 public:
 
-  /* Utilities */
-
-  template<typename T>
-  void streamWrite(T last) {
-    stream.print(last);
-  }
-
-  template<typename T, typename... Args>
-  void streamWrite(T head, Args... tail) {
-    stream.print(head);
-    streamWrite(tail...);
-  }
+  /*
+   Utilities
+   */
 
   void streamClear(void) {
     TINY_GSM_YIELD();
     while (stream.available()) { stream.read(); }
   }
 
-  bool commandMode(int retries = 2) {
-    int triesMade = 0;
-    bool success = false;
-    streamClear();  // Empty everything in the buffer before starting
-    while (!success and triesMade < retries) {
-      // Cannot send anything for 1 "guard time" before entering command mode
-      // Default guard time is 1s, but the init fxn decreases it to 250 ms
-      delay(guardTime);
-      streamWrite(GF("+++"));  // enter command mode
-      DBG("+++");
-      success = (1 == waitResponse(guardTime*2));
-      triesMade ++;
-    }
-    return success;
-  }
-
-  bool writeChanges(void) {
-    sendAT(GF("WR"));  // Write changes to flash
-    if (1 != waitResponse()) return false;
-    sendAT(GF("AC"));  // Apply changes
-    if (1 != waitResponse()) return false;
-    return true;
-  }
-
-  void exitCommand(void) {
-    sendAT(GF("CN"));  // Exit command mode
-    waitResponse();
-  }
-
-  String readResponse(uint32_t timeout = 1000) {
-    TINY_GSM_YIELD();
-    unsigned long startMillis = millis();
-    while (!stream.available() && millis() - startMillis < timeout) {};
-    String res = stream.readStringUntil('\r');  // lines end with carriage returns
-    res.trim();
-    DBG("<<< ", res);
-    return res;
-  }
-
   template<typename... Args>
   void sendAT(Args... cmd) {
     streamWrite("AT", cmd..., GSM_NL);
@@ -825,6 +793,7 @@ finish:
         // DBG("<<< ", data);
       }
     }
+    //DBG('<', index, '>');
     return index;
   }
 
@@ -842,6 +811,45 @@ finish:
     return waitResponse(1000, r1, r2, r3, r4, r5);
   }
 
+  bool commandMode(int retries = 2) {
+    int triesMade = 0;
+    bool success = false;
+    streamClear();  // Empty everything in the buffer before starting
+    while (!success and triesMade < retries) {
+      // Cannot send anything for 1 "guard time" before entering command mode
+      // Default guard time is 1s, but the init fxn decreases it to 250 ms
+      delay(guardTime);
+      streamWrite(GF("+++"));  // enter command mode
+      DBG("+++");
+      success = (1 == waitResponse(guardTime*2));
+      triesMade ++;
+    }
+    return success;
+  }
+
+  bool writeChanges(void) {
+    sendAT(GF("WR"));  // Write changes to flash
+    if (1 != waitResponse()) return false;
+    sendAT(GF("AC"));  // Apply changes
+    if (1 != waitResponse()) return false;
+    return true;
+  }
+
+  void exitCommand(void) {
+    sendAT(GF("CN"));  // Exit command mode
+    waitResponse();
+  }
+
+  String readResponse(uint32_t timeout = 1000) {
+    TINY_GSM_YIELD();
+    unsigned long startMillis = millis();
+    while (!stream.available() && millis() - startMillis < timeout) {};
+    String res = stream.readStringUntil('\r');  // lines end with carriage returns
+    res.trim();
+    DBG("<<< ", res);
+    return res;
+  }
+
 public:
   Stream&       stream;
 

src/TinyGsmCommon.h

@@ -69,6 +69,7 @@ namespace {
   }
 }
 #else
+  #define DBG_PLAIN(...)
   #define DBG(...)
 #endif
 
@@ -194,4 +195,135 @@ String TinyGsmDecodeHex16bit(String &instr) {
   return result;
 }
 
+
+
+
+class TinyGsmModem
+{
+
+public:
+
+  TinyGsmModem(Stream& stream)
+    : stream(stream)
+  {}
+
+  /*
+   * Basic functions
+   */
+
+  // Prepare the modem for further functionality
+  virtual bool init(const char* pin = NULL) = 0;
+  // Begin is redundant with init
+  virtual bool begin(const char* pin = NULL) {
+    return init(pin);
+  }
+  // Returns a string with the chip name
+  virtual String getModemName() = 0;
+  // Sets the serial communication baud rate
+  virtual void setBaud(unsigned long baud) = 0;
+  // Checks that the modem is responding to standard AT commands
+  virtual bool testAT(unsigned long timeout = 10000L) = 0;
+  // Holds open communication with the modem waiting for data to come in
+  virtual void maintain() = 0;
+  // Resets all modem chip settings to factor defaults
+  virtual bool factoryDefault() = 0;
+  // Returns the response to a get info request.  The format varies by modem.
+  virtual String getModemInfo() = 0;
+  // Answers whether types of communication are available on this modem
+  virtual bool hasSSL() = 0;
+  virtual bool hasWifi() = 0;
+  virtual bool hasGPRS() = 0;
+
+  /*
+   * Power functions
+   */
+
+  virtual bool restart() = 0;
+
+  /*
+   * SIM card functions - only apply to cellular modems
+   */
+
+  virtual bool simUnlock(const char *pin) { return false; }
+  virtual String getSimCCID() { return ""; }
+  virtual String getIMEI() { return ""; }
+  virtual String getOperator() { return ""; }
+
+ /*
+  * Generic network functions
+  */
+
+  virtual int getSignalQuality() = 0;
+  // NOTE:  this returns whether the modem is registered on the cellular or WiFi
+  // network NOT whether GPRS or other internet connections are available
+  virtual bool isNetworkConnected() = 0;
+  virtual bool waitForNetwork(unsigned long timeout = 60000L) {
+    for (unsigned long start = millis(); millis() - start < timeout; ) {
+      if (isNetworkConnected()) {
+        return true;
+      }
+      delay(250);
+    }
+    return false;
+  }
+
+  /*
+   * WiFi functions - only apply to WiFi modems
+   */
+
+  virtual bool networkConnect(const char* ssid, const char* pwd) { return false; }
+  virtual bool networkDisconnect() { return false; }
+
+  /*
+   * GPRS functions - only apply to cellular modems
+   */
+
+  virtual bool gprsConnect(const char* apn, const char* user = NULL, const char* pwd = NULL) {
+    return false;
+  }
+  virtual bool gprsDisconnect() { return false; }
+
+  /*
+   * IP Address functions
+   */
+
+  virtual String getLocalIP() = 0;
+  virtual IPAddress localIP() {
+    return TinyGsmIpFromString(getLocalIP());
+  }
+
+    /*
+     Utilities
+     */
+
+    template<typename T>
+    void streamWrite(T last) {
+      stream.print(last);
+    }
+
+    template<typename T, typename... Args>
+    void streamWrite(T head, Args... tail) {
+      stream.print(head);
+      streamWrite(tail...);
+    }
+
+    bool streamSkipUntil(const char c, const unsigned long timeout = 1000L) {
+      unsigned long startMillis = millis();
+      while (millis() - startMillis < timeout) {
+        while (millis() - startMillis < timeout && !stream.available()) {
+          TINY_GSM_YIELD();
+        }
+        if (stream.read() == c)
+          return true;
+      }
+      return false;
+    }
+
+public:
+  Stream&       stream;
+};
+
+
+
+
 #endif

tools/test_build/test_build.ino

@@ -3,6 +3,7 @@
  *  DO NOT USE THIS - this is just a compilation test!
  *
  **************************************************************/
+#define TINY_GSM_MODEM_SIM800
 
 #include <TinyGsmClient.h>
 
@@ -77,4 +78,3 @@ void loop() {
     modem.networkDisconnect();
   #endif
 }
-