Laird Connectivity is now Ezurio/filters:background_color(white)/2022-05/summit-hero.png)
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Answer
Using the test scripts provided with BlueZ to setup a GATT server:
cd /lib/bluez/test/ ./example-gatt-server & Power on Bluetooth, start advertising and set to pairable:
# bluetoothctl Agent registered [bluetooth]# power on Changing power on succeeded [bluetooth]# advertise on [bluetooth]# pairable on Connect with Nordic's nRF smartphone app and read the fake battery level.