I have been searching for this for long long time now, but failed drastically to find any tips. Your help is very much appreciated.
I am using
ArduinoBLE Library on Arduino Nano 33 IoT.
There is no method to
setTxPower() in it. I need to lower the transmission power to limit the BLE advertising range within 2 to 3 meters.
Some people suggested using
setManufacturerData() method in the same library. However, I have no clue what data to write in it, or even if the transmission power can be changed like that way in the first place.
Looking forward to hearing from you,