mqtt synchronous client - thread usage

[titov]

Hi all , 

I am working on a resource constraint device which limits me on the number of threads I can use.I would like to know how many threads does the java paho client mqtt sychronous client will use on these scenarios.

This is the client class in question  --- org.eclipse.paho.client.mqttv3.MqttClient

What would be the thread usage on the following scenarios , ( I am making synchronous calls only )

1. While connecting to broker ( initial connection )

2. while subscribing to broker for a single topic and will it increase based on the number of subscriptions.

3. While I reconnect to the broker , assuming the mqtt client instance is already created.

I am not much of thread expert. I cannot run a profiler or thread monitor , but I am trying to setup a thread monitor with java concurrent executor service  on my limited hardware.

Any information on thread usage will be helpful.

[Dave Locke]

Once connected the Paho client uses three threads.  One for send, one receive and one for call backs.   In future there is an intent to use non blocking io and reduce the number of threads.  That will require a change the minimum level of Java that is supported, moving up from todays minimum of Java 1.4.2 (and JME CLDC)


All the best
Dave

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