Re: [paho-dev] Paho Client for Embedded C

[Ian Craggs <icraggs@xxxxxxxxxxxxxxxxxxxxxxx>]

Hi Praveen,

I might be missing it but I don't see a link in your mail.  Is this the client library you mean?

http://git.eclipse.org/c/paho/org.eclipse.paho.mqtt.embedded-c.git/tree/MQTTClient-C

If so, I am looking at that code right now.  I think that it is probably missing the function to redeliver messages on reconnection, and I'll be looking to add that in.  I do have some questions which would help me understand what is needed:

1) do you absolutely need C rather than C++? (mbed, for instance uses C++)

2) what OS/network interface are you using?  That's not essential to know but is interesting/useful.

3) what QoS are you using (1 or 2?).  QoS 0 messages are not redelivered.

4) none of the embedded client libraries currently store undelivered messages into a persistent store as yet.  I was waiting for someone to ask before contemplating doing do, in the interests of not adding function that no-one uses.  I am interested in adding that in.

I'm happy to have a phone call to discuss.  I'll send an email directly.

Ian

On 03/26/2015 10:23 PM, Yalavarty, Praveen (P.Y.) wrote:

Hello:

 

Can someone confirm that the Paho embedded C client available for download at the below link can handle the resending of MQTT packets when a TCP connection is reestablished, so that the application does not need to? Does this client handle MQTT message queueing in the event of

1.       connection loss

2.       power loss on the device (is there a way for the client to let the underlying hardware to store the undelivered messages into an Non-Volatile Memory.

 

Any help to answer these questions is much appreciated. Ideally, I’d like to have a phone call to talk through some of these questions if that is a possibility.

 

Thanks,

 

Praveen K Yalavarty

Chief Architect  - Systems Engineering | Connected Vehicle and Services | Ford Motor Company | Email: pyalavar@xxxxxxxx | Contact: 313-323-7787

 

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-- 
Ian Craggs                          
icraggs@xxxxxxxxxx                 IBM United Kingdom
Paho Project Lead; Committer on Mosquitto