SSL/TLS support. Added GsmClientSecure. Fix #29

TinyGsmClientSIM800.h

@@ -180,6 +180,24 @@ private:
   RxFifo        rx;
 };
 
+class GsmClientSecure : public GsmClient
+{
+public:
+  GsmClientSecure() {}
+
+  GsmClientSecure(TinyGsm& modem, uint8_t mux = 1)
+    : GsmClient(modem, mux)
+  {}
+
+public:
+  virtual int connect(const char *host, uint16_t port) {
+    TINY_GSM_YIELD();
+    rx.clear();
+    sock_connected = at->modemConnect(host, port, mux, true);
+    return sock_connected;
+  }
+};
+
 public:
 
   TinyGsm(Stream& stream)
@@ -262,6 +280,14 @@ public:
     return res;
   }
 
+  bool hasSSL() {
+    sendAT(GF("+CIPSSL=?"));
+    if (waitResponse(GF(GSM_NL "+CIPSSL:")) != 1) {
+      return false;
+    }
+    return waitResponse() == 1;
+  }
+
   /*
    * Power functions
    */
@@ -648,12 +674,17 @@ public:
 
 private:
 
-  bool modemConnect(const char* host, uint16_t port, uint8_t mux) {
+  bool modemConnect(const char* host, uint16_t port, uint8_t mux, bool ssl = false) {
+    sendAT(GF("+CIPSSL="), ssl);
+    int rsp = waitResponse();
+    if (ssl && rsp != 1) {
+      return false;
+    }
     sendAT(GF("+CIPSTART="), mux, ',', GF("\"TCP"), GF("\",\""), host, GF("\","), port);
-    int rsp = waitResponse(75000L,
+    rsp = waitResponse(75000L,
-                           GF("CONNECT OK" GSM_NL),
+                       GF("CONNECT OK" GSM_NL),
-                           GF("CONNECT FAIL" GSM_NL),
+                       GF("CONNECT FAIL" GSM_NL),
-                           GF("ALREADY CONNECT" GSM_NL));
+                       GF("ALREADY CONNECT" GSM_NL));
     return (1 == rsp);
   }
 
@@ -879,5 +910,6 @@ private:
 };
 
 typedef TinyGsm::GsmClient TinyGsmClient;
+typedef TinyGsm::GsmClientSecure TinyGsmClientSecure;
 
 #endif

examples/HttpsClient/HttpsClient.ino

@@ -0,0 +1,154 @@
+/**************************************************************
+ *
+ * This sketch connects to a website and downloads a page.
+ * It can be used to perform HTTP/RESTful API calls.
+ *
+ * For this example, you need to install ArduinoHttpClient library:
+ *   https://github.com/arduino-libraries/ArduinoHttpClient
+ *   or from http://librarymanager/all#ArduinoHttpClient
+ *
+ * TinyGSM Getting Started guide:
+ *   http://tiny.cc/tiny-gsm-readme
+ *
+ **************************************************************/
+
+// Select your modem
+// SSL/TLS is currently supported only with SIM800 series
+#define TINY_GSM_MODEM_SIM800
+
+// Increase RX buffer
+#define TINY_GSM_RX_BUFFER 64
+
+// Use Hardware Serial on Mega, Leonardo, Micro
+#define SerialAT Serial1
+
+// or Software Serial on Uno, Nano
+//#include <SoftwareSerial.h>
+//SoftwareSerial SerialAT(2, 3); // RX, TX
+
+//#define DUMP_AT_COMMANDS
+//#define TINY_GSM_DEBUG Serial
+
+
+// Your GPRS credentials
+// Leave empty, if missing user or pass
+const char apn[]  = "YourAPN";
+const char user[] = "";
+const char pass[] = "";
+
+// Name of the server we want to connect to
+const char server[] = "cdn.rawgit.com";
+const int  port     = 443;
+// Path to download (this is the bit after the hostname in the URL)
+const char resource[] = "/vshymanskyy/tinygsm/master/extras/logo.txt";
+
+#include <TinyGsmClient.h>
+#include <ArduinoHttpClient.h>
+
+#ifdef DUMP_AT_COMMANDS
+  #include <StreamDebugger.h>
+  StreamDebugger debugger(SerialAT, Serial);
+  TinyGsm modem(debugger);
+#else
+  TinyGsm modem(SerialAT);
+#endif
+
+TinyGsmClientSecure client(modem);
+HttpClient http(client, server, port);
+
+void setup() {
+  // Set console baud rate
+  Serial.begin(115200);
+  delay(10);
+
+  // Set GSM module baud rate
+  SerialAT.begin(115200);
+  delay(3000);
+
+  // Restart takes quite some time
+  // To skip it, call init() instead of restart()
+  Serial.println("Initializing modem...");
+  modem.restart();
+
+  String modemInfo = modem.getModemInfo();
+  Serial.print("Modem: ");
+  Serial.println(modemInfo);
+
+  // Unlock your SIM card with a PIN
+  //modem.simUnlock("1234");
+}
+
+void loop() {
+  if (!modem.hasSSL()) {
+    Serial.print("SSL is not supported by this modem");
+    delay(10000);
+    return;
+  }
+
+  Serial.print(F("Waiting for network..."));
+  if (!modem.waitForNetwork()) {
+    Serial.println(" fail");
+    delay(10000);
+    return;
+  }
+  Serial.println(" OK");
+
+  Serial.print(F("Connecting to "));
+  Serial.print(apn);
+  if (!modem.gprsConnect(apn, user, pass)) {
+    Serial.println(" fail");
+    delay(10000);
+    return;
+  }
+  Serial.println(" OK");
+
+
+  Serial.print(F("Performing HTTP GET request... "));
+  http.connectionKeepAlive(); // Currently, this is needed for HTTPS
+  int err = http.get(resource);
+  if (err != 0) {
+    Serial.println("failed to connect");
+    delay(10000);
+    return;
+  }
+
+  int status = http.responseStatusCode();
+  Serial.println(status);
+  if (!status) {
+    delay(10000);
+    return;
+  }
+
+  while (http.headerAvailable()) {
+    String headerName = http.readHeaderName();
+    String headerValue = http.readHeaderValue();
+    //Serial.println(headerName + " : " + headerValue);
+  }
+
+  int length = http.contentLength();
+  if (length >= 0) {
+    Serial.println(String("Content length is: ") + length);
+  }
+  if (http.isResponseChunked()) {
+    Serial.println("This response is chunked");
+  }
+
+  String body = http.responseBody();
+  Serial.println("Response:");
+  Serial.println(body);
+
+  Serial.println(String("Body length is: ") + body.length());
+
+  // Shutdown
+
+  http.stop();
+
+  modem.gprsDisconnect();
+  Serial.println("GPRS disconnected");
+
+  // Do nothing forevermore
+  while (true) {
+    delay(1000);
+  }
+}
+

keywords.txt

@@ -3,6 +3,7 @@
 #######################################
 TinyGsm	KEYWORD1
 TinyGsmClient	KEYWORD1
+TinyGsmClientSecure	KEYWORD1
 
 SerialAT	KEYWORD1
 SerialMon	KEYWORD1