L2CAP: Unknown error: 431 and 436

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Created Feb ’21

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I am trying to work with L2CAP channels over BLE. The service discovery, PSM lookup (via characteristics) and such all work fine.

The channel connects and I am able to exchange a couple of packets before the input stream is closed unexpectedly.

Meanwhile, the console reports the following CoreBluetooth messages:

Code Block error	WARNING: Unknown error: 431
error	WARNING: Unknown error: 436

As far as I can tell these error codes are undocumented and the L2CAP documentation is scarce at best. Does anyone know what they mean?

Answered by neilalexander in 662739022

For anyone else who finds this in the future, I have been advised that the error codes are as follows:

431: Peer device requested an L2CAP disconnection
436: Local device requested an L2CAP disconnection

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Answer 1

neilalexander OP

Feb ’21

Accepted Answer

For anyone else who finds this in the future, I have been advised that the error codes are as follows:

431: Peer device requested an L2CAP disconnection
436: Local device requested an L2CAP disconnection

1

Answer 2

pkiman OP

Nov ’21

We are experiencing this on Monterey. The Bluetooth Core Framework has changed significantly. I hope apple will fix it ASAP.

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Answer 3

DrMickeyLauer OP

Apr ’24

I'd applaud a proper mapping table in the documentation…

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