Jon Shallow 8975c15cd8 coap_resource.c: Fix observe callback timing window ...

If multiple clients subscribe to the same resource, one of the clients
'goes away', the server will eventually close down the session for that client
which will then remove any subscriptions, iterating through the different
resources.

If this happens at the same time that coap_resource_notify_observers() is called
in another thread, and the GET/FETCH handler is called for a common resource
and in particular for the session that is now going away, on return from the
callback the subscription may no longer exist.  This PR fixes this window.

In addition, if the resource subscriber list is being traversed, then a another
call to coap_notify_observers() for the same resource will not generate a new set
unsolicited observe responses for multi-thread protection.

Update

2025-05-20 15:25:31 +01:00

..

coap3

coap_resource.c: Fix observe callback timing window

2025-05-20 15:25:31 +01:00

oscore

coap_oscore.c: Process queued OSCORE Observe responses after de-registration

2024-10-28 14:33:34 +00:00