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Drop empty asynchronous observer responses

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Mario KichererandCopilot authored and Jon Shallow committed 2026-10-06 14:14:41 +01:00
1 parent cd9f19055b
commit 3dc2c812c6
1 file changed
+15 -1
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src/coap_resource.c
+15 -1
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@@ -1412,7 +1412,21 @@ coap_notify_observers(coap_context_t *context, coap_resource_t *r,
}
#endif /* COAP_Q_BLOCK_SUPPORT */
}
mid = coap_send_internal(obs_session, response, NULL);
if (response->code == COAP_EMPTY_CODE &&
(response->type == COAP_MESSAGE_NON ||
response->type == COAP_MESSAGE_CON) &&
response->actual_token.length != 0) {
/*
* If a resource has been updated, triggering the sending of an
* observer response and the request handler does not set a response
* code (a coding error condition), then this PDU must be dropped as
* it is illegally formatted.
*/
coap_delete_pdu_lkd(response);
mid = (coap_mid_t)COAP_DROPPED_RESPONSE;
} else {
mid = coap_send_internal(obs_session, response, NULL);
}
#if COAP_Q_BLOCK_SUPPORT
finish: