Only auto-stop emulating if sender
Only the sender will actively call .._start_emulating() on devices, and only the receiver expects to receive 'start-emulating' events to notify about the sender is going to start emitting events.
However, hile both sides will enter the state 'EMULATING', only the sender should send 'stop-emulating' when the device is closing.
Signed-off-by: Jonas Ådahl jadahl@gmail.com