Custom firmware to change data format


I need to change the data format from MessagePack to JSON, is the firmware opensource to do that ?
If yes, what is the procedure to flash the Gateway ?

Thanks in advance!

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I found the JSON format type in the latest version of the config tool but I need to change the format of the JSON, how can I do that ? Is the firmware open source ?

I am able to get JSON format from gateway, I have similar question on how to change JSON format as my MQTT broker expects JSON in a particular format only.

The firmware is not open source. You can change the request format to JSON format with latest config tool directly.

Could you please make an example for the particular format?