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How to send messages to telematics hub from my custom solution via MQTT?

Using MQTT to put the data into your flespi channel.

MQTT usage assumes that you have a good technical background. This may be written on first demand. However, we have everything explained here:

See also
What details to provide to get comprehensive and useful answers fast.
The sequence of actions to follow when you want your device to be supported by the flespi platform.