Re: [paho-dev] Detecting disconnects

[Andrew McClure <andrew@xxxxxxxxxxxxxx>]

Hi Roger

The use case is very simple. I am polling loop() every x seconds and checking for a return value of 0.

I kill the broker - control C or whatever - as part of a robstness test.

The code code automatically tries to reconnect so that's how I detect the error 61 - Connection Refused = socket error.

http://southweb.co.nz/telemetrylayer (this is our QGIS plugin but I don't expect you to have to download and understand it)


On 21/01/2015, at 6:31 am, Roger Light <roger@xxxxxxxxxx> wrote:

> Hi Andrew,
> 
> I agree, not very useful. I can see where those return codes would
> happen, but I've not been able to reproduce the behaviour myself. Can
> you give me any more details on what you are doing? You should see a
> printed error message as well when you get a 1 returned. Did you see
> that and if so what was it?
> 
> I think this whole area might need a bit of a rethink for Paho 1.2.
> 
> Cheers,
> 
> Roger
> 
> 
> On Sun, Jan 18, 2015 at 1:13 AM, Andrew McClure <andrew@xxxxxxxxxxxxxx> wrote:
>> Am wondering the best way to manage error handling and reporting of > 0 return values from loop().
>> 
>> e.g. the return value from loop() after the broker has gone away is initially the rc value - typically 1 (MQTT_ERR_NOMEM)
>> 
>>        if self.socket() in socklist[0]:
>>            rc = self.loop_read(max_packets)
>>            if rc or (self._ssl is None and self._sock is None):
>>                return rc
>> 
>> This is a little hard to report meaningfully. It is only on the subsequent reconnect attempt that we get the errno 61 - Connection Refused.
>> 
>> Am thinking that ignoring or printing a debug statement with the returned rc value is the best we can hope for.  Thanks.
>> 
>> 
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