Examples: add Cellular support

Author: pennam

examples/ConnectionHandlerDemo/ConnectionHandlerDemo.ino

@@ -43,6 +43,8 @@ NBConnectionHandler conMan(SECRET_PIN);
 LoRaConnectionHandler conMan(SECRET_APP_EUI, SECRET_APP_KEY);
 #elif defined(BOARD_HAS_CATM1_NBIOT)
 CatM1ConnectionHandler conMan(SECRET_APN, SECRET_PIN, SECRET_GSM_USER, SECRET_GSM_PASS);
+#elif defined(BOARD_HAS_CELLULAR)
+CellularConnectionHandler conMan(SECRET_PIN, SECRET_APN, SECRET_GSM_USER, SECRET_GSM_PASS);
 #endif
 
 void setup() {

examples/ConnectionHandlerDemo/arduino_secrets.h

@@ -1,10 +1,10 @@
 const char SECRET_SSID[] = "NETWORK NAME";
 const char SECRET_PASS[] = "NETWORK PASSWORD";
 
-const char SECRET_APN[] 		= "MOBILE PROVIDER APN ADDRESS";
-const char SECRET_PIN[] 		= "0000";
-const char SECRET_GSM_USER[] 	= "GSM USERNAME";
-const char SECRET_GSM_PASS[]	= "GSM PASSWORD";
+const char SECRET_APN[] 		= "iliad";
+const char SECRET_PIN[] 		= "";
+const char SECRET_GSM_USER[] 	= "";
+const char SECRET_GSM_PASS[]	= "";
 
 const char SECRET_APP_EUI[]  = "APP_EUI";
 const char SECRET_APP_KEY[]  = "APP_KEY";