Machine join not working

[fernandoFernandeSantos]

When the Machine thread is stopped, it tries to connect to devices that may not be available; it creates issues to stop the server, which can wait for the devices for a long time (Machine. join function).

Possible solution:

1. User pressed ctrl+c
2. The server calls the Machine.stop and Machine.join
3. The Machine Thread first checks if the device is alive; if yes, send a kill command to the device
4. Machine Thread finish joining normally