Re: [mosquitto-dev] Repeated messages

[Romu Hu <huruomu@xxxxxxxxx>]

Hi Andy, Roger, Oegma2,

I couldn't reproduce the issue whatsoever today, no matter with 
mosquitto_sub or Android PAHO subscriber.  From the mosquitto.log, the 
server receives PUBACK from subscribersshortly after sending the 
messages to the subscribers.  But I believe what Roger suggested is the 
reason of the issue.

Thanks
Romu

On 2014/10/30 21:57, Roger Light wrote:
> Hi Romu,
>
> Do you disconnect quickly after receiving the messages?It is possible
> that the PUBACKs from your client are not sent to the broker before
> you disconnect.
>
> You can test this out by looking at the broker logs with "log_type
> debug" (or by starting with "-v"). Look for "Received PUBACK from
> ...."
>
> Cheers,
>
> Roger
>
>
> On Thu, Oct 30, 2014 at 6:47 AM, Romu Hu <huruomu@xxxxxxxxx> wrote:
> > Hi,
> >
> > I'm facing a weird problem: Sending 5 messages ('1', '2', '3', '4', '5')
> > using android phone (PAHO mqtt library) to a topic (using mosquitto as
> > broker), using qos=1, not retained, the subscriber (another android phone,
> > also using PAHO mqtt library) of the topic receives these messages, then
> > shutdown the network connection of the subscriber phone and turn it on again
> > after about 30 seconds, the subscriber immediately receives '3', '4' and '5'
> > again, then shutdown and restart the network again, the subscriber receives
> > '4' and '5' again, shutdown and restart the network again, the subscriber
> > receives '5'.
> >
> > The receiving of the repeated messages is not 100% reproducible. Sometimes
> > the receiving of the repeated messages happens a couple of minutes after
> > network reconnection.  The publisher and receiver always connects to the
> > broker with clean session as false.
> >
> > Why is this happening?
> >
> >
> > Thanks
> > Romu
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