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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
Building multi-layer flespi applications with the help of hierarchical subaccounts structure.
Helping you quickly go through the real-life issues.