GSM: add TLS certificate to GSMSSLClient and point to example.com server

Author: pennam

libraries/GSM/examples/GSMSSLClient/GSMSSLClient.ino

@@ -1,20 +1,24 @@
 /*
   GSMSSLlient
 
-  This sketch connects to a website (https://ifconfig.me)
+  This sketch connects to a website (https://example.com)
   using the Portenta CAT.M1/NB IoT GNSS Shield and TLS.
  
  */
 
 #include <GSM.h>
-
 #include "arduino_secrets.h" 
+
+#if defined(ARDUINO_EDGE_CONTROL)
+  #include "root_ca.h"
+#endif
+
 char pin[]      = SECRET_PIN;
 char apn[]      = SECRET_APN;
 char username[] = SECRET_USERNAME;
 char pass[]     = SECRET_PASSWORD;
 
-const char  server[] = "ifconfig.me";
+const char  server[] = "example.com";
 const char* ip_address;
 int port = 443;
 GSMSSLClient client;
@@ -25,6 +29,9 @@ void setup() {
   // Power ON MKR2
   pinMode(ON_MKR2, OUTPUT);
   digitalWrite(ON_MKR2, HIGH);
+
+  // Configure root certificate
+  client.appendCustomCACert(root_ca);
 #endif
 
   Serial.begin(115200);
@@ -45,7 +52,7 @@ void setup() {
   if (client.connect(server, port)) {
     Serial.println("connected to server");
     // Make a HTTP request:
-    client.println("GET /ip HTTP/1.1");
+    client.println("GET / HTTP/1.1");
     client.print("Host: ");
     client.println(server);
     client.println("Connection: close");

libraries/GSM/examples/GSMSSLClient/root_ca.h

@@ -0,0 +1,23 @@
+static const char root_ca[] = 
+"-----BEGIN CERTIFICATE-----\n"
+"MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh\n"
+"MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3\n"
+"d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBD\n"
+"QTAeFw0wNjExMTAwMDAwMDBaFw0zMTExMTAwMDAwMDBaMGExCzAJBgNVBAYTAlVT\n"
+"MRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5j\n"
+"b20xIDAeBgNVBAMTF0RpZ2lDZXJ0IEdsb2JhbCBSb290IENBMIIBIjANBgkqhkiG\n"
+"9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4jvhEXLeqKTTo1eqUKKPC3eQyaKl7hLOllsB\n"
+"CSDMAZOnTjC3U/dDxGkAV53ijSLdhwZAAIEJzs4bg7/fzTtxRuLWZscFs3YnFo97\n"
+"nh6Vfe63SKMI2tavegw5BmV/Sl0fvBf4q77uKNd0f3p4mVmFaG5cIzJLv07A6Fpt\n"
+"43C/dxC//AH2hdmoRBBYMql1GNXRor5H4idq9Joz+EkIYIvUX7Q6hL+hqkpMfT7P\n"
+"T19sdl6gSzeRntwi5m3OFBqOasv+zbMUZBfHWymeMr/y7vrTC0LUq7dBMtoM1O/4\n"
+"gdW7jVg/tRvoSSiicNoxBN33shbyTApOB6jtSj1etX+jkMOvJwIDAQABo2MwYTAO\n"
+"BgNVHQ8BAf8EBAMCAYYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUA95QNVbR\n"
+"TLtm8KPiGxvDl7I90VUwHwYDVR0jBBgwFoAUA95QNVbRTLtm8KPiGxvDl7I90VUw\n"
+"DQYJKoZIhvcNAQEFBQADggEBAMucN6pIExIK+t1EnE9SsPTfrgT1eXkIoyQY/Esr\n"
+"hMAtudXH/vTBH1jLuG2cenTnmCmrEbXjcKChzUyImZOMkXDiqw8cvpOp/2PV5Adg\n"
+"06O/nVsJ8dWO41P0jmP6P6fbtGbfYmbW0W5BjfIttep3Sp+dWOIrWcBAI+0tKIJF\n"
+"PnlUkiaY4IBIqDfv8NZ5YBberOgOzW6sRBc4L0na4UU+Krk2U886UAb3LujEV0ls\n"
+"YSEY1QSteDwsOoBrp+uvFRTp2InBuThs4pFsiv9kuXclVzDAGySj4dzp30d8tbQk\n"
+"CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=\n"
+"-----END CERTIFICATE-----\n";