AIOBLE - Stuck on exhange MTU

[steveli777]

in AIOBLE, when exchanging MTU, it will call ble.gattc_exchange_mtu() method, and wait for the Exchange_MTU event is back.

And in some scenario, the peripheral will disconnect the central when receiving the MTU exchange request.

And at this moment, the Exhange_MTU event will never return. It causes the stuck.

[jimmo]

OK I will have to look into this in more detail, and I agree this should be handled by the exchange_mtu function.

In the meantime you can use

with connection.timeout(2000):
  await connection.exchange_mtu(...)

But the correct solution is probably to make exchange_mtu take a timeout argument, like many of the other methods do.

Note: with connection.timeout() is will also terminate the enclosed code on disconnection (as well as, of course, timeout).

[jimmo]

Quick followup... in general you can use

with connection:
   ...

which will automatically disconnect (or terminate if the other side disconnects). This may not be appropriate if you've got multiple tasks sharing the connection though, but just FYI.

[andrewleech]

I've addressed exactly this with a timeout argument added to mtu requests in #465

[mattytrentini]

#465 resolves this issue, if there's more discuss on the issue lets do so there.