TinyGSM_Senseright/src/TinyGsmClientSIM5360.h

/**
 * @file       TinyGsmClientSIM5360.h
 * @author     Volodymyr Shymanskyy
 * @license    LGPL-3.0
 * @copyright  Copyright (c) 2016 Volodymyr Shymanskyy
 * @date       Nov 2016
 */

#ifndef TinyGsmClientSIM5360_h
#define TinyGsmClientSIM5360_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 10

#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,
};

enum TinyGSMDateTimeFormat {
  DATE_FULL = 0,
  DATE_TIME = 1,
  DATE_DATE = 2
};

class TinyGsmSim5360
{

public:

class GsmClient : public Client
{
  friend class TinyGsmSim5360;
  typedef TinyGsmFifo<uint8_t, TINY_GSM_RX_BUFFER> RxFifo;

public:
  GsmClient() {}

  GsmClient(TinyGsmSim5360& modem, uint8_t mux = 0) {
    init(&modem, mux);
  }

  virtual ~GsmClient(){}

  bool init(TinyGsmSim5360* modem, uint8_t mux = 0) {
    this->at = modem;
    this->mux = mux;
    sock_available = 0;
    prev_check = 0;
    sock_connected = false;
    got_data = false;

    at->sockets[mux] = this;

    return true;
  }

public:
  virtual int connect(const char *host, uint16_t port, int timeout_s) {
    stop();
    TINY_GSM_YIELD();
    rx.clear();
    sock_connected = at->modemConnect(host, port, mux, false, timeout_s);
    return sock_connected;
  }

TINY_GSM_CLIENT_CONNECT_OVERLOADS()

  virtual void stop(uint32_t maxWaitMs) {
    TINY_GSM_CLIENT_DUMP_MODEM_BUFFER()
    at->sendAT(GF("+CIPCLOSE="), mux);
    sock_connected = false;
    at->waitResponse();
  }

  virtual void stop() { stop(15000L); }

TINY_GSM_CLIENT_WRITE()

TINY_GSM_CLIENT_AVAILABLE_WITH_BUFFER_CHECK()

TINY_GSM_CLIENT_READ_WITH_BUFFER_CHECK()

TINY_GSM_CLIENT_PEEK_FLUSH_CONNECTED()

  /*
   * Extended API
   */

  String remoteIP() TINY_GSM_ATTR_NOT_IMPLEMENTED;

private:
  TinyGsmSim5360* at;
  uint8_t         mux;
  uint16_t        sock_available;
  uint32_t        prev_check;
  bool            sock_connected;
  bool            got_data;
  RxFifo          rx;
};


public:

  TinyGsmSim5360(Stream& stream)
    : stream(stream)
  {
    memset(sockets, 0, sizeof(sockets));
  }

  virtual ~TinyGsmSim5360(){}

  /*
   * Basic functions
   */

  bool begin(const char* pin = NULL) {
    return init(pin);
  }

  bool init(const char* pin = NULL) {
    DBG(GF("### TinyGSM Version:"), TINYGSM_VERSION);

    if (!testAT()) {
      return false;
    }

    sendAT(GF("E0"));   // Echo Off
    if (waitResponse() != 1) {
      return false;
    }

    DBG(GF("### Modem:"), getModemName());

    int ret = getSimStatus();
    // if the sim isn't ready and a pin has been provided, try to unlock the sim
    if (ret != SIM_READY && pin != NULL && strlen(pin) > 0) {
      simUnlock(pin);
      return (getSimStatus() == SIM_READY);
    }
    // if the sim is ready, or it's locked but no pin has been provided, return
    // true
    else {
      return (ret == SIM_READY || ret == SIM_LOCKED);
    }
  }

  String getModemName() {
    String name =  "SIMCom SIM5360";

    sendAT(GF("+CGMM"));
    String res2;
    if (waitResponse(1000L, res2) != 1) {
      return name;
    }
    res2.replace(GSM_NL "OK" GSM_NL, "");
    res2.replace("_", " ");
    res2.trim();

    name = res2;
    DBG("### Modem:", name);
    return name;
  }

TINY_GSM_MODEM_SET_BAUD_IPR()

TINY_GSM_MODEM_TEST_AT()

TINY_GSM_MODEM_MAINTAIN_CHECK_SOCKS()

  bool factoryDefault() {  // these commands aren't supported
    return false;
  }

TINY_GSM_MODEM_GET_INFO_ATI()

  bool hasSSL() {
    return false;  // TODO:  Module supports SSL, but not yet implemented
  }

  bool hasWifi() {
    return false;
  }

  bool hasGPRS() {
    return true;
  }

  /*
   * Power functions
   */

  bool restart() {
    if (!testAT()) {
      return false;
    }
    sendAT(GF("+REBOOT"));
    if (waitResponse(10000L) != 1) {
      return false;
    }
    delay(3000L);  // TODO:  Test this delay!
    return init();
  }

  bool poweroff() {
    sendAT(GF("+CPOF"));
    return waitResponse() == 1;
  }

  bool radioOff() {
    sendAT(GF("+CFUN=4"));
    if (waitResponse(10000L) != 1) {
      return false;
    }
    delay(3000);
    return true;
  }

  bool sleepEnable(bool enable = true) {
    sendAT(GF("+CSCLK="), enable);
    return waitResponse() == 1;
  }

  /*
   * SIM card functions
   */

TINY_GSM_MODEM_SIM_UNLOCK_CPIN()

// Gets the CCID of a sim card via AT+CCID
  String getSimCCID() {
    sendAT(GF("+CICCID"));
    if (waitResponse(GF(GSM_NL "+ICCID:")) != 1) {
      return "";
    }
    String res = stream.readStringUntil('\n');
    waitResponse();
    res.trim();
    return res;
  }

TINY_GSM_MODEM_GET_IMEI_GSN()

  SimStatus getSimStatus(unsigned long timeout_ms = 10000L) {
    for (unsigned long start = millis(); millis() - start < timeout_ms; ) {
      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;
  }

TINY_GSM_MODEM_GET_REGISTRATION_XREG(CGREG)

TINY_GSM_MODEM_GET_OPERATOR_COPS()

  /*
   * Generic network functions
   */

TINY_GSM_MODEM_GET_CSQ()

  bool isNetworkConnected() {
    RegStatus s = getRegistrationStatus();
    return (s == REG_OK_HOME || s == REG_OK_ROAMING);
  }

  String getNetworkModes() {
    sendAT(GF("+CNMP=?"));
    if (waitResponse(GF(GSM_NL "+CNMP:")) != 1) {
      return "";
    }
    String res = stream.readStringUntil('\n');
    waitResponse();
    return res;
  }

TINY_GSM_MODEM_WAIT_FOR_NETWORK()

  String setNetworkMode(uint8_t mode) {
      sendAT(GF("+CNMP="), mode);
      if (waitResponse(GF(GSM_NL "+CNMP:")) != 1) {
        return "OK";
      }
    String res = stream.readStringUntil('\n');
    waitResponse();
    return res;
  }


  /*
   * GPRS functions
   */

  bool gprsConnect(const char* apn, const char* user = NULL, const char* pwd = NULL) {
    gprsDisconnect();  // Make sure we're not connected first

    // Define the PDP context

    // The CGDCONT commands set up the "external" PDP context

    // Set the external authentication
    if (user && strlen(user) > 0) {
      sendAT(GF("+CGAUTH=1,0,\""), user, GF("\",\""), pwd, '"');
      waitResponse();
    }

    // Define external PDP context 1
    sendAT(GF("+CGDCONT=1,\"IP\",\""), apn, '"',",\"0.0.0.0\",0,0");
    waitResponse();

    // The CGSOCKCONT commands define the "embedded" PDP context for TCP/IP

    // Define the socket PDP context
    sendAT(GF("+CGSOCKCONT=1,\"IP\",\""), apn, '"');
    waitResponse();

    // Set the embedded authentication
    if (user && strlen(user) > 0) {
      sendAT(GF("+CSOCKAUTH=1,1,\""), user, "\",\"", pwd, '"');
      waitResponse();
    }

    // Set active PDP context’s profile number
    // This ties the embedded TCP/IP application to the external PDP context
    sendAT(GF("+CSOCKSETPN=1"));
    waitResponse();

    // Configure TCP parameters

    // Select TCP/IP application mode (command mode)
    sendAT(GF("+CIPMODE=0"));
    waitResponse();

    // Set Sending Mode - send without waiting for peer TCP ACK
    sendAT(GF("+CIPSENDMODE=0"));
    waitResponse();

    // Configure socket parameters
    //AT+CIPCCFG= [<NmRetry>][,[<DelayTm>][,[<Ack>][,[<errMode>][,]<HeaderType>][,[[<AsyncMode>][,[<TimeoutVal>]]]]]]]]
    // NmRetry = number of retransmission to be made for an IP packet = 10 (default)
    // DelayTm = number of milliseconds to delay to output data of Receiving = 0 (default)
    // Ack = sets whether reporting a string “Send ok” = 0 (don't report)
    // errMode = mode of reporting error result code = 0 (numberic values)
    // HeaderType = which data header of receiving data in multi-client mode = 1 (“+RECEIVE,<link num>,<data length>”)
    // AsyncMode = sets mode of executing commands = 0 (synchronous command executing)
    // TimeoutVal = minimum retransmission timeout in milliseconds = 75000
    sendAT(GF("+CIPCCFG=10,0,0,0,1,0,75000"));
    if (waitResponse() != 1) {
      return false;
    }

    // Configure timeouts for opening and closing sockets
    // AT+CIPTIMEOUT=[<netopen_timeout>][, [<cipopen_timeout>][, [<cipsend_timeout>]]]
    sendAT(GF("+CIPTIMEOUT="), 75000, ',', 15000, ',', 15000);
    waitResponse();

    // Start the socket service

    // This activates and attaches to the external PDP context that is tied
    // to the embedded context for TCP/IP (ie AT+CGACT=1,1 and AT+CGATT=1)
    // Response may be an immediate "OK" followed later by "+NETOPEN: 0".
    // We to ignore any immediate response and wait for the
    // URC to show it's really connected.
    sendAT(GF("+NETOPEN"));
    if (waitResponse(75000L, GF(GSM_NL "+NETOPEN: 0")) != 1) {
      return false;
    }

    return true;
  }

  bool gprsDisconnect() {
    // Close any open sockets
    for (int mux = 0; mux < TINY_GSM_MUX_COUNT; mux++) {
      GsmClient *sock = sockets[mux];
      if (sock) {
        sock->stop();
      }
    }

    // Stop the socket service
    // Note: all sockets should be closed first - on 3G/4G models the sockets must be closed manually
    sendAT(GF("+NETCLOSE"));
    if (waitResponse(60000L, GF(GSM_NL "+NETCLOSE: 0")) != 1) {
      return false;
    }

    return true;
  }

  bool isGprsConnected() {
    sendAT(GF("+NETOPEN?"));
    // May return +NETOPEN: 1, 0.  We just confirm that the first number is 1
    if (waitResponse(GF(GSM_NL "+NETOPEN: 1")) != 1) {
      return false;
    }
    waitResponse();

    sendAT(GF("+IPADDR")); // Inquire Socket PDP address
    // sendAT(GF("+CGPADDR=1")); // Show PDP address
    if (waitResponse() != 1) {
      return false;
    }

    return true;
  }

  /*
   * IP Address functions
   */

  String getLocalIP() {
    sendAT(GF("+IPADDR"));  // Inquire Socket PDP address
    // sendAT(GF("+CGPADDR=1"));  // Show PDP address
    String res;
    if (waitResponse(10000L, res) != 1) {
      return "";
    }
    res.replace(GSM_NL "OK" GSM_NL, "");
    res.replace(GSM_NL, "");
    res.trim();
    return res;
  }

  IPAddress localIP() {
    return TinyGsmIpFromString(getLocalIP());
  }

  /*
   * Phone Call functions
   */

  bool setGsmBusy() TINY_GSM_ATTR_NOT_IMPLEMENTED;
  bool callAnswer() TINY_GSM_ATTR_NOT_IMPLEMENTED;
  bool callNumber() TINY_GSM_ATTR_NOT_IMPLEMENTED;
  bool callHangup() TINY_GSM_ATTR_NOT_IMPLEMENTED;
  bool dtmfSend() TINY_GSM_ATTR_NOT_IMPLEMENTED;

  /*
   * Messaging functions
   */

  String sendUSSD(const String& code) {
    // Select message format (1=text)
    sendAT(GF("+CMGF=1"));
    waitResponse();
    // Select TE character set
    sendAT(GF("+CSCS=\"HEX\""));
    waitResponse();
    sendAT(GF("+CUSD=1,\""), code, GF("\""));
    if (waitResponse() != 1) {
      return "";
    }
    if (waitResponse(10000L, GF(GSM_NL "+CUSD:")) != 1) {
      return "";
    }
    stream.readStringUntil('"');
    String hex = stream.readStringUntil('"');
    stream.readStringUntil(',');
    int dcs = stream.readStringUntil('\n').toInt();

    if (dcs == 15) {
      return TinyGsmDecodeHex8bit(hex);
    } else if (dcs == 72) {
      return TinyGsmDecodeHex16bit(hex);
    } else {
      return hex;
    }
  }

  bool sendSMS(const String& number, const String& text) {
    // Get SMS service centre address
    sendAT(GF("+AT+CSCA?"));
    waitResponse();
    // Select message format (1=text)
    sendAT(GF("+CMGF=1"));
    waitResponse();
    //Set GSM 7 bit default alphabet (3GPP TS 23.038)
    sendAT(GF("+CSCS=\"GSM\""));
    waitResponse();
    // Send the message!
    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) {
    // Select message format (1=text)
    sendAT(GF("+CMGF=1"));
    waitResponse();
    // Select TE character set
    sendAT(GF("+CSCS=\"HEX\""));
    waitResponse();
    // Set text mode parameters
    sendAT(GF("+CSMP=17,167,0,8"));
    waitResponse();
    // Send the message
    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;
  }


  /*
   * Location functions
   */

  String getGsmLocation()  TINY_GSM_ATTR_NOT_IMPLEMENTED;

  /*
   * GPS location functions
   */

  /*
   * Time functions
   */

  /*
   * Battery & temperature 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 battery charge status
    streamSkipUntil(','); // Skip battery charge level
    // get voltage in VOLTS
    float voltage = stream.readStringUntil('\n').toFloat();
    // Wait for final OK
    waitResponse();
    // Return millivolts
	uint16_t res = voltage*1000;
    return res;
  }

  int8_t getBattPercent() {
    sendAT(GF("+CBC"));
    if (waitResponse(GF(GSM_NL "+CBC:")) != 1) {
      return false;
    }
    streamSkipUntil(','); // Skip battery charge status
    // Read battery charge level
    int res = stream.readStringUntil(',').toInt();
    // Wait for final OK
    waitResponse();
    return res;
  }

  uint8_t getBattChargeState() {
    sendAT(GF("+CBC?"));
    if (waitResponse(GF(GSM_NL "+CBC:")) != 1) {
      return false;
    }
    // Read battery charge status
    int res = stream.readStringUntil(',').toInt();
    // Wait for final OK
    waitResponse();
    return res;
  }

  bool getBattStats(uint8_t &chargeState, int8_t &percent, uint16_t &milliVolts) {
    sendAT(GF("+CBC?"));
    if (waitResponse(GF(GSM_NL "+CBC:")) != 1) {
      return false;
    }
    chargeState = stream.readStringUntil(',').toInt();
    percent = stream.readStringUntil(',').toInt();
    // get voltage in VOLTS
    float voltage = stream.readStringUntil('\n').toFloat();
    milliVolts = voltage*1000;
    // Wait for final OK
    waitResponse();
    return true;
  }

  // get temperature in degree celsius
  float getTemperature() {
    // Enable Temparature Reading
    sendAT(GF("+CMTE=1"));
    if (waitResponse() != 1) {
      return 0;
    }
    // Get Temparature Value
    sendAT(GF("+CMTE?"));
    if (waitResponse(GF(GSM_NL "+CMTE:")) != 1) {
      return false;
    }
    float res = stream.readStringUntil('\n').toFloat();
    // Wait for final OK
    waitResponse();
    return res;
  }

  /*
   * Client related functions
   */

protected:

  bool modemConnect(const char* host, uint16_t port, uint8_t mux,
                    bool ssl = false, int timeout_s = 15) {
    // Make sure we'll be getting data manually on this connection
    sendAT(GF("+CIPRXGET=1"));
    if (waitResponse() != 1) {
      return false;
    }

    if (ssl) DBG("SSL not yet supported on this module!");

    // Establish a connection in multi-socket mode
    uint32_t timeout_ms = ((uint32_t)timeout_s) * 1000;
    sendAT(GF("+CIPOPEN="), mux, ',', GF("\"TCP"), GF("\",\""), host, GF("\","), port);
    // The reply is +CIPOPEN: ## of socket created
    if (waitResponse(timeout_ms, GF(GSM_NL "+CIPOPEN:")) != 1) {
      return false;
    }
    return true;
  }

  int16_t modemSend(const void* buff, size_t len, uint8_t mux) {
    sendAT(GF("+CIPSEND="), mux, ',', len);
    if (waitResponse(GF(">")) != 1) {
      return 0;
    }
    stream.write((uint8_t*)buff, len);
    stream.flush();
    if (waitResponse(GF(GSM_NL "+CIPSEND:")) != 1) {
      return 0;
    }
    streamSkipUntil(','); // Skip mux
    streamSkipUntil(','); // Skip requested bytes to send
    // TODO:  make sure requested and confirmed bytes match
    return stream.readStringUntil('\n').toInt();
  }

  size_t modemRead(size_t size, uint8_t mux) {
#ifdef TINY_GSM_USE_HEX
    sendAT(GF("+CIPRXGET=3,"), mux, ',', size);
    if (waitResponse(GF("+CIPRXGET:")) != 1) {
      return 0;
    }
#else
    sendAT(GF("+CIPRXGET=2,"), mux, ',', size);
    if (waitResponse(GF("+CIPRXGET:")) != 1) {
      return 0;
    }
#endif
    streamSkipUntil(','); // Skip Rx mode 2/normal or 3/HEX
    streamSkipUntil(','); // Skip mux/cid (connecion id)
    size_t len_requested = stream.readStringUntil(',').toInt();
    //  ^^ Requested number of data bytes (1-1460 bytes)to be read
    size_t len_confirmed = stream.readStringUntil('\n').toInt();
    // ^^ The data length which not read in the buffer
    for (size_t i=0; i<len_requested; i++) {
      uint32_t startMillis = millis();
#ifdef TINY_GSM_USE_HEX
      while (stream.available() < 2 && (millis() - startMillis < sockets[mux]->_timeout)) { TINY_GSM_YIELD(); }
      char buf[4] = { 0, };
      buf[0] = stream.read();
      buf[1] = stream.read();
      char c = strtol(buf, NULL, 16);
#else
      while (!stream.available() && (millis() - startMillis < sockets[mux]->_timeout)) { TINY_GSM_YIELD(); }
      char c = stream.read();
#endif
      sockets[mux]->rx.put(c);
    }
    DBG("### READ:", len_requested, "from", mux);
    // sockets[mux]->sock_available = modemGetAvailable(mux);
    sockets[mux]->sock_available = len_confirmed;
    waitResponse();
    return len_requested;
  }

  size_t modemGetAvailable(uint8_t mux) {
    sendAT(GF("+CIPRXGET=4,"), mux);
    size_t result = 0;
    if (waitResponse(GF("+CIPRXGET:")) == 1) {
      streamSkipUntil(','); // Skip mode 4
      streamSkipUntil(','); // Skip mux
      result = stream.readStringUntil('\n').toInt();
      waitResponse();
    }
    DBG("### Available:", result, "on", mux);
    if (!result) {
      sockets[mux]->sock_connected = modemGetConnected(mux);
    }
    return result;
  }

  bool modemGetConnected(uint8_t mux) {
    // Read the status of all sockets at once
    sendAT(GF("+CIPCLOSE?"));
    if (waitResponse(GF("+CIPCLOSE:")) != 1) {
      return false;
    }
    for (int muxNo = 0; muxNo <= TINY_GSM_MUX_COUNT; muxNo++) {
      // +CIPCLOSE:<link0_state>,<link1_state>,...,<link9_state>
      sockets[muxNo]->sock_connected = stream.parseInt();
    }
    waitResponse();  // Should be an OK at the end
    return sockets[mux]->sock_connected;
  }

public:

  /*
   Utilities
   */

TINY_GSM_MODEM_STREAM_UTILITIES()

  // TODO: Optimize this!
  uint8_t waitResponse(uint32_t timeout_ms, 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) {
        TINY_GSM_YIELD();
        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 "+CIPRXGET:"))) {
          String mode = stream.readStringUntil(',');
          if (mode.toInt() == 1) {
            int mux = stream.readStringUntil('\n').toInt();
            if (mux >= 0 && mux < TINY_GSM_MUX_COUNT && sockets[mux]) {
              sockets[mux]->got_data = true;
            }
            data = "";
            DBG("### Got Data:", mux);
          } else {
            data += mode;
          }
        } else if (data.endsWith(GF(GSM_NL "+RECEIVE:"))) {
          int mux = stream.readStringUntil(',').toInt();
          int len = stream.readStringUntil('\n').toInt();
          if (mux >= 0 && mux < TINY_GSM_MUX_COUNT && sockets[mux]) {
            sockets[mux]->got_data = true;
            sockets[mux]->sock_available = len;
          }
          data = "";
          DBG("### Got Data:", len, "on", mux);
        } else if (data.endsWith(GF("+IPCLOSE:"))) {
          int mux = stream.readStringUntil(',').toInt();
          streamSkipUntil('\n');  // Skip the reason code
          if (mux >= 0 && mux < TINY_GSM_MUX_COUNT && sockets[mux]) {
            sockets[mux]->sock_connected = false;
          }
          data = "";
          DBG("### Closed: ", mux);
        } else if (data.endsWith(GF("+CIPEVENT:"))) {
          // Need to close all open sockets and release the network library.
          // User will then need to reconnect.
          DBG("### Network error!");
          if (!isGprsConnected()) {
            gprsDisconnect();
          }
          data = "";
        }
      }
    } while (millis() - startMillis < timeout_ms);
finish:
    if (!index) {
      data.trim();
      if (data.length()) {
        DBG("### Unhandled:", data);
      }
      data = "";
    }
    //data.replace(GSM_NL, "/");
    //DBG('<', index, '>', data);
    return index;
  }

  uint8_t waitResponse(uint32_t timeout_ms,
                       GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
  {
    String data;
    return waitResponse(timeout_ms, 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