Re: [mosquitto-dev] Help needed, odd behaviour: What are the reasons the

[Felipe de Andrade Neves Lavratti <felipelav@xxxxxxxxx>]

The client implementation is mine-ish, actually. The client runs on a
baremetal firmware (contiki) where there's no dynamic memory
allocation, that's one reason I need max inflight=1, the other is I
need order granteed.

I changed the keep alive timer by myself, I'll test with 60s.

I am not using client expiry. Non connection has been remade on tests,
I think I didn't get what you meant.


New info:

I've just been debugging the mosquitto broker on the moment of the
detected odd behavior. The client context (struct mosquitto *) that
has stopped receiving PUBLISH, has all pending messages in the
`mosq_ms_queued` state. The point is that they won't leave that state.
Didn't find out why yet.

On Tue, Jul 7, 2015 at 7:06 PM, Karl Palsson <karlp@xxxxxxxxxxxx> wrote:
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> Felipe de Andrade Neves Lavratti <felipelav@xxxxxxxxx> wrote:
>> Again,
>>
>> The problem is easy to replicate:
>>
>> The setup is this:
>> - I have 6 clients connected to the broker
>> - All clients are subscribed to the topic 'test'
>> - All clients reply on topic 'testout' for each message received in topic 'test'
>
> fwiw, you might find it easier to diagnose if you send a sequence
> instead of a fixed string.  I personally found the mid's to be rather
> odd in your earlier trace,
>
>> - All clients send PINGs each 20s
>> - A connection expires in 60s
>
> so, is keepalive 20sec, and you have private modified code then?  and
> you're still based on 1.3.x?  or something else?  note in your traces
> that d==0, so persistent client expiry is completely irrelevant, custom
> code or not.
>
>> - Every message is QOS2
>>
>> The test routine is this:
>> Publishes to the topic 'test' periodically in a frequency faster than
>> the clients can answer (on my slow 802.15.4 network I use 3 seconds)
>
> honestly I think your contiki setup is fundamentally broken, and you
> should chase this up there.  read the pinola paper just for starters,
> you should be looking at _maybe_ 250ms.  3 seconds is _insane_ and even
> if you hack mosquitto to make this particular test case pass, I think
> you will just see new problems down the road.  please consider Roger's
> points about (ab)using (or trying) client expiry to "fix" things that
> maybe need a different solution.
>
> Cheers,
> Karl P
>
>
>> until you realise that the broker will stop sending any publish to a
>> client until the client reconnects.
>>
>> It is feeling like a bug, what extra info you may need on this?
>>
>> Bellow another log of the problem.
>>
>> --------
>>
>>
>> **** Send a PUBLISH to everybody, including fe80::215:8d00:76:813f.
>>
>> 1436302152: Sending PUBLISH to aaaa::215:8d00:76:813a (d0, q2, r0,
>> m46, 'test', ... (9 bytes))
>> 1436302152: Sending PUBLISH to fe80::215:8d00:76:8140 (d0, q2, r0,
>> m46, 'test', ... (9 bytes))
>> 1436302152: Sending PUBLISH to fe80::215:8d00:76:813b (d0, q2, r0,
>> m46, 'test', ... (9 bytes))
>> 1436302152: Sending PUBLISH to fe80::215:8d00:76:8136 (d0, q2, r0,
>> m46, 'test', ... (9 bytes))
>> 1436302152: Sending PUBLISH to fe80::215:8d00:76:8139 (d0, q2, r0,
>> m46, 'test', ... (9 bytes))
>> 1436302152: Sending PUBLISH to fe80::215:8d00:76:813f (d0, q2, r0,
>> m46, 'test', ... (9 bytes))
>>
>
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