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Cannot programmatically access Inreach via bluetooth

Hi, I read your excellent tutorial “Bluetooth Tutorial for iOS: Heart Rate Monitor” and other found on the web but I could find an answer.
I would like to communicate directly with the device inReach-Mini from Garmin without using the Earthmate app.
The device is paired to my iPad and Earthmate works fine with it but when I try to programmatically communicate with the inreach, it is not seen at all. Do you know what could be the reason, is this device using other protocols? I already asked Garmin but didn’t get any answer until now.
Thank you in advance and best regards