Rover radio cal fixes

Throttle trim must be center throttle

src/AutoPilotPlugins/Common/RadioComponentController.cc

@@ -206,11 +206,20 @@ void RadioComponentController::_advanceState(void)
 /// @brief Sets up the state machine according to the current step from _currentStep.
 void RadioComponentController::_setupCurrentState(void)
 {
+    static const char* msgBeginAPMRover = "Center the Throttle stick as shown in diagram.\nReset all transmitter trims to center.\n\n"
+                                          "Please ensure all motor power is disconnected from the vehicle.\n\n"
+                                          "Click Next to continue";
     const stateMachineEntry* state = _getStateMachineEntry(_currentStep);
 
-    _statusText->setProperty("text", state->instructions);
-    
-    _setHelpImage(state->image);
+    const char* instructions = state->instructions;
+    const char* helpImage = state->image;
+    if (_vehicle->rover() && _currentStep == 0) {
+        // Hack in center throttle start for Rover. This is to set the correct centered trim for throttle.
+        instructions = msgBeginAPMRover;
+        helpImage = _imageCenter;
+    }
+    _statusText->setProperty("text", instructions);
+    _setHelpImage(helpImage);
     
     _stickDetectChannel = _chanMax();
     _stickDetectSettleStarted = false;