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Set values dynamically in a command set

 
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My aim is to send a few sets of commands to an embedded device via bluetooth. Ideally, those commands look like:



I want to dynamically set the values of NUM and DEV. One way is creating this from scratch (by attaching to StringBuffer) each time it executes. Is there any proper way of implementing?

Can we use placeholders like we do in reporting APIs?

Thanks in advance!
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