Re: [iot-wg] Questions regarding MQTT/Paho

[Jens Reimann <jens.reimann@xxxxxxxxxxxxxxx>]

Hello Ian,

thanks for the answer.

I totally understand the reason for passing through the protocol
specific to a simple API. And it is important to have this control.

However, now I fully understand when you bang your head on the table
;-), "I just want to push some data to MQTT".

No I would guess that there are some "common ways to do it" and which
get repeatedly implemented by users. So instead of everybody
re-implementing these common cases, it would simply be nice to have
these coming from the MQTT library.

Actually In Eclipse SCADA we have the some issue. Connections simply
inform you about the state, but the "AutoReconnectController" keeps the
session open as long as requested.

Anyway, thanks for the help. So I now know that I have to do it myself ;)

Jens

On 07/29/2014 03:15 PM, Ian Craggs wrote:
> Hi Jens,
>
> what Benjamin says is correct.  It is a manual step to reconnect in
> the callback.  This is for a number of reasons.
>
> 1.  MQTT is defined as a protocol rather than an API, so the APIs have
> been written to be close to the behaviour of MQTT.  This makes it easy
> to understand the APIs in the context of MQTT, and provides maximum
> flexibility.
>
> 2. Depending on the connect options used, will message or clean
> session for instance, disconnection and reconnection can have effects
> which you need to know about and/or control.  You may want to change
> connect options when you reconnect, or delay reconnection.  To allow
> all these combinations on automatic reconnection would require a
> complicated API.
>
> Ian
>
> On 07/25/2014 02:08 PM, Benjamin Cabé wrote:
>> Hi Jens,
>>
>> I think you may want to post this question on the paho-dev mailing
>> list (I
>> cross-posted there)!
>> My understanding though is that when the MqttCallback#connectionLost()
>> method is called, it's up to you to decide whether you want to reconnect
>> or not.
>>
>> Benjamin.
>>
>>
>> Le 25/07/2014 14:47, « Jens Reimann » <jens.reimann@xxxxxxxxxxxxxxx> a
>> écrit :
>>
>>> Hi,
>>>
>>> maybe somebody can give me a short hint about the MqttAsyncClient from
>>> Paho.
>>>
>>> I found the javadoc, and know how to connect and disconnect. What I
>>> don't know is, what will happen when the connection breaks. Does it
>>> automatically re-connect, or is this a "manual" step?
>>>
>>> Thanks for helping
>>>
>>> Jens
>>>
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