added gps definitions file

mission/devices/GPSHandler.cpp

@@ -1,4 +1,5 @@
 #include "GPSHandler.h"
+#include "devicedefinitions/GPSDefinitions.h"
 
 GPSHandler::GPSHandler(object_id_t objectId, object_id_t deviceCommunication,
 		CookieIF *comCookie):
@@ -62,9 +63,10 @@ ReturnValue_t GPSHandler::initializeLocalDataPool(
 }
 
 void GPSHandler::fillCommandAndReplyMap() {
-
+    // Reply length does not matter, packets should always arrive periodically
+    insertInReplyMap(GpsHyperion::GPS_REPLY, 4, nullptr, 0, true);
 }
 
 void GPSHandler::modeChanged() {
-
+    internalState = InternalStates::NONE;
 }