Increased link timeout

src/uas/UASInterface.h

@@ -546,7 +546,7 @@ signals:
 protected:
 
     // TIMEOUT CONSTANTS
-    static const unsigned int timeoutIntervalHeartbeat = 1500 * 1000; ///< Heartbeat timeout is 1.5 seconds
+    static const unsigned int timeoutIntervalHeartbeat = 3500 * 1000; ///< Heartbeat timeout is 2.5 seconds
 
 };