Hi,
I was playing around with your gem and got this error when trying to do the following things:
- connect to a ble device
- get rssi, tx_power, services or characteristics.
I tried running ruby on a raspberry pi 3 and a dragonboard but got the same error. I updated bluez to the latest version and also used a bluetooth dongle to be sure that the problem was not coming from the internal bluetooth of the boards. I also played around with hciconfig but no success. I wonder if someone already encountered the same problem or not.
Thanks for your help in advance.