[OTA] Add Github Digicert cert hash check (#1965)

to avoid loading a deprecated certificate

main/User_config.h

@@ -82,12 +82,7 @@
 #  endif
 #endif
 
-#if defined(ESP8266) || defined(ESP32) // for nodemcu, weemos and esp8266
 //#  define ESPWifiManualSetup true //uncomment you don't want to use wifimanager for your credential settings on ESP
-#else // for arduino boards
-const byte ip[] = {192, 168, 1, 99};
-const byte mac[] = {0xDE, 0xED, 0xBA, 0xFE, 0x54, 0x95}; //W5100 ethernet shield MAC address
-#endif
 
 //#define ESP32_ETHERNET=true // Uncomment to use Ethernet module on ESP32 Ethernet gateway and adapt the settings to your board below, the default parameter are for OLIMEX ESP32 gateway
 #ifdef ESP32_ETHERNET
@@ -217,6 +212,8 @@ const byte mac[] = {0xDE, 0xED, 0xBA, 0xFE, 0x54, 0x95}; //W5100 ethernet shield
 #  define AWS_IOT false
 #endif
 
+#define GITHUB_OTA_SERVER_CERT_HASH "d4d211b4553af9fac371f24c2268d59d2b0fec6b9aa0fdbbde068f078d7daf86" // SHA256 fingerprint of the certificate used by the OTA server
+
 #if AWS_IOT
 // Enable the use of ALPN for AWS IoT Core with the port 443
 const char* alpnProtocols[] = {"x-amzn-mqtt-ca", NULL};