public void cancel() {
		cancelQueue();
		super.cancel();
	}
Cancels all the enqueued operations that were not executed yet.
The one currently executed will be cancelled, if it is {@link TimeoutableRequest}.
<p>
Cancelled operations will NOT be notified with {@link FailCallback#REASON_CANCELLED},
they will be just removed from the queue.
<p>
It is safe to call this method in {@link Request#done(SuccessCallback)} or
{@link Request#fail(FailCallback)} callback;
ble/src/main/java/no/nordicsemi/android/ble/RequestQueue.java