lwm2m: send_attempts field does not seem to be used?

[tautologyclub]

Zephyr version: 2.6.0

Just grepped for send_attempts and it does not seem to be used anywhere. Just incremented. client.retries is checked, but not send_attempts. I am not sure if this 100% means retransmits are borked, but that does feel like a possibility :)

[tautologyclub]

I can verify that it certainly seems that the stack has trouble resending. It just keeps trying until it runs out of allocated messages, then errors out.

[rlubos]

@tautologyclub You're referencing outdated code - send_attempts field was removed a few months ago, as being unused, the retransmission logic is based on retry field from struct coap_pending (https://github.com/zephyrproject-rtos/zephyr/blob/main/subsys/net/lib/lwm2m/lwm2m_engine.c#L4133). Works with no issue with recent master.

[rlubos]

Retransmission logic on 2.6.0 works fine as well on my side.

[carlescufi]

@tautologyclub as per @rlubos's analysis, this does not seem to be an actual, current issue. If you still think this is a real bug, please reopen this issue.