Return A control connection status. False means A control lost control. The possible reason is that A control is turned off or loses connection with the aircraft.
Return the connection status of APP in A control. False means APP in A control lost control. The possible reason is that the APP in A control has exited, please reopen the APP in A control.
Return B control connection status.False means B control lost control. The possible reason is that B control is not connected to the frequency, turns off or loses connection with the aircraft.
Return the connection status of APP in B control.False means APP in B control lost control. The possible reason is that the APP in B control has exited, please reopen the APP in B control.