Hi Refik,
the joystick subsystem is rather redundant in that case (all it does is add the USE_JOYSTICK), so I removed it in master...
Now do you want to completely replace the "normal" RC by a joystick or just be able to fly with joystick in AUTO2 while in a certain flight plan block.
If you want the former, use the <subsystem name="radio_control" type="datalink"/> and use a input2ivy conf file to send e.g. the RC_4CH message.
If you want the latter, it probably needs a bit more work: you need to add an extra block to the flight plan and set the joystick_block to that block id.
Then send the JOYSTICK_RAW message by an appropriate config file for input2ivy...
Hope that helps...
Cheers, Felix