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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
Set up HTTP callback to flespi channel to use Sigfox devices in telematics projects.
Configure a stream to forward device messages from IoT or telematics hardware into the AWS IoT.