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https://dennismellonfitness.com/2018/02/28/how-to-find-the-ant-id-of-your-heart-rate-chest-strap-using-an-android-device-with-the-ant-to-ble-heart-ant-id-finder-app/
How to find the Ant+ ID of your heart rate chest strap using an Android device with the Ant+ to BLE Heart Ant+ ID Finder app