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Is it possible to interface ESP32 with Garmin watch (Fenix 5) via BLE?

Hi..I've been trying to create a speedsensor for my treadmill with ESP32. It works with Zwift just fine.

But for some reason Garmin can't see the sensor? I wonder why not? 

It must be the Garning needs that something special  characteristic adverticed before it can connect.

Interesting discussion here.

Any help or sample code that works appreciated.