Fixed range of data type

src/comm/MAVLinkSimulationLink.h

@@ -123,7 +123,7 @@ protected:
 
     void enqueue(uint8_t* stream, uint8_t* index, mavlink_message_t* msg);
 
-    static const int8_t systemId = 220;
+    static const uint8_t systemId = 220;
     static const uint8_t componentId = 200;
     static const uint16_t version = 1000;