extmod/bluetooth: handling of disconnect in ble_simple_central.py example is misleading
The handling of the disconnect event in ble_simple_central.py is misleading. The condition if conn_handle == self._conn_handle:
(line 108) makes it look as if a different value for conn_handle would mean that there's nothing to do, but this is not the case. In particular, a disconnect can happen during the connection process, at least with nimble on the esp32, in which case self._conn_handle is still None and conn_handle != self._conn_handle but calling self._reset() is necessary.
https://github.com/micropython/micropython/blob/203e1d2a65273db3f6ff063ba1124a89c3482c0f/examples/bluetooth/ble_simple_central.py#L108
There is mistake in BLE simple central when disconnect is called
There is code in git:
https://github.com/micropython/micropython/blob/41ed01f1394ea608bf9d055120d671e2765cd9b7/examples/bluetooth/ble_simple_central.py#L181-L185
I used that code and my device never disconnected, I found problem in "if" condition and change it to following code, which works for me:
def disconnect(self):
if self._conn_handle is None:
return
self._ble.gap_disconnect(self._conn_handle)):
self._reset()