GSM: Add GSMSSLClient example

libraries/GSM/examples/GSMSSLClient/GSMSSLClient.ino

@@ -0,0 +1,66 @@
+/*
+  GSMSSLlient
+
+  This sketch connects to a website (https://ifconfig.me)
+  using the Portenta CAT.M1/NB IoT GNSS Shield and TLS.
+ 
+ */
+
+#include <GSM.h>
+
+#include "arduino_secrets.h" 
+char pin[]      = SECRET_PIN;
+char apn[]      = SECRET_APN;
+char username[] = SECRET_USERNAME;
+char pass[]     = SECRET_PASSWORD;
+
+const char  server[] = "ifconfig.me";
+const char* ip_address;
+int port = 443;
+GSMSSLClient client;
+
+void setup() {
+  Serial.begin(115200);
+  while(!Serial) {}
+  Serial.println("Starting Carrier Network registration");
+  if(!GSM.begin(pin, apn, username, pass, CATM1, BAND_3 | BAND_20 | BAND_19)){
+    Serial.println("The board was not able to register to the network...");
+    // do nothing forevermore:
+    while(1);
+  }
+  Serial.println("\nStarting connection to server...");
+  // if you get a connection, report back via serial:
+  if (client.connect(server, port)) {
+    Serial.println("connected to server");
+    // Make a HTTP request:
+    client.println("GET /ip HTTP/1.1");
+    client.print("Host: ");
+    client.println(server);
+    client.println("Connection: close");
+    client.println();
+  } else {
+    Serial.println("unable to connect to server");
+  }
+
+}
+
+void loop() {
+
+  // if there are incoming bytes available
+  // from the server, read them and print them:
+  while (client.available()) {
+    char c = client.read();
+    Serial.write(c);
+  }
+
+  // if the server's disconnected, stop the client:
+  if (!client.connected()) {
+    Serial.println();
+    Serial.println("disconnecting from server.");
+    client.stop();
+
+    // do nothing forevermore:
+    while (true);
+  }
+
+}

libraries/GSM/examples/GSMSSLClient/arduino_secrets.h

@@ -0,0 +1,4 @@
+#define SECRET_PIN ""
+#define SECRET_APN ""
+#define SECRET_USERNAME ""
+#define SECRET_PASSWORD ""