Add new internal commands to exception list (#499)

Author: tekka007

libraries/MySensors/core/MySigning.cpp

@@ -84,10 +84,12 @@ static bool skipSign(MyMessage &msg) {
 		SIGN_DEBUG(PSTR("Skipping security for ACK on command %d type %d\n"), mGetCommand(msg), msg.type);
 		return true;
 	}	else if (mGetCommand(msg) == C_INTERNAL &&
-		(msg.type == I_NONCE_REQUEST || msg.type == I_NONCE_RESPONSE       || msg.type == I_SIGNING_PRESENTATION ||
-	   msg.type == I_ID_REQUEST    || msg.type == I_ID_RESPONSE          ||
-	   msg.type == I_FIND_PARENT   || msg.type == I_FIND_PARENT_RESPONSE ||
-	   msg.type == I_HEARTBEAT     || msg.type == I_HEARTBEAT_RESPONSE)) {
+		(msg.type == I_NONCE_REQUEST	|| msg.type == I_NONCE_RESPONSE			|| msg.type == I_SIGNING_PRESENTATION ||
+		msg.type == I_ID_REQUEST		|| msg.type == I_ID_RESPONSE			||
+		msg.type == I_FIND_PARENT		|| msg.type == I_FIND_PARENT_RESPONSE	||
+		msg.type == I_HEARTBEAT			|| msg.type == I_HEARTBEAT_RESPONSE		||
+		msg.type == I_PING				|| msg.type == I_PONG					||
+		msg.type == I_REGISTRATION_REQUEST	)) {
 		SIGN_DEBUG(PSTR("Skipping security for command %d type %d\n"), mGetCommand(msg), msg.type);
 		return true;
 	} else if (mGetCommand(msg) == C_STREAM &&