Combining Mqtt-sn publisher subscriber Thread example on different topics

Hello, 

Can anyone please provide me some idea about how to combine the mqtt-sn publisher example publishing on data topic with the mqtt-sn subscriber example subscribed on cmd topic. 

I want to combine this both example, I have looked for refference on devzone and got one post but there also the subscribe and publishing was on same topic. 

Can someone please provide some basic code snippet. Thanks. 

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