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MQSeries.net Forum IndexIBM MQ Telemetry / Low Latency Messaging / Everyplacemqtt android client - republish message on disconnect

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boristep
PostPosted: Wed Apr 06, 2016 3:41 am Post subject: mqtt android client - republish message on disconnect Reply with quote

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Joined: 02 Jan 2013
Posts: 9

We have to publish messages from MQTT clients (Android) with unstable connection. What is a right way to resend a message from a client that lost its connection to the server and can't connect at the moment?
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mqjeff
PostPosted: Wed Apr 06, 2016 5:04 am Post subject: Reply with quote

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Joined: 25 Jun 2008
Posts: 16764

MQTT clients should be buffering messages on the client side. They should resend when the connection is active.

http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718103
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boristep
PostPosted: Thu Apr 07, 2016 12:00 am Post subject: Reply with quote

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Joined: 02 Jan 2013
Posts: 9

I use Paho Java Client. Does this client have this functionality or I have to implement it in the application?
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mqjeff
PostPosted: Thu Apr 07, 2016 4:22 am Post subject: Reply with quote

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Joined: 25 Jun 2008
Posts: 16764

boristep wrote:
I use Paho Java Client. Does this client have this functionality or I have to implement it in the application?


The link I posted is for the official specification of the MQTT protocol, not for information about a specific client.

The paho client will work the same way as any other client that implements the full and correct spec.
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boristep
PostPosted: Thu Apr 07, 2016 4:28 am Post subject: Reply with quote

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Joined: 02 Jan 2013
Posts: 9

Thank you mqjeff
Actually the question is how I implement this functionality using Paho Java Client?
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mqjeff
PostPosted: Thu Apr 07, 2016 4:30 am Post subject: Reply with quote

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Joined: 25 Jun 2008
Posts: 16764

boristep wrote:
Thank you mqjeff
Actually the question is how I implement this functionality using Paho Java Client?


Don't use cleanSession.

That's it.

I mean set cleanSession to false, unless your paho client knows that it needs to discard any messages that haven't been delivered in either direction (after some kind of device reset for example).
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