Connect custom device to home assistant

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Hi everyone.

I am a newbie using the home assistant.

This is what I looking for:

I have developed a control panel inside a NodeMCU plus a touch screen.

I want to integrate the panel to the home assistant but I don’t know how what could be the best way to do it.

I searched through the integrations without luck.

The idea is to communicate the panel with home-assistant through MQTT. Basically the panel has a state in the form of a JSON ARRAY, each entry will be a home assistant entity.