BLE gatttool cannot connect even though device is discoverable with hcitool lescan
问题 I'm running RPi with a USB Bluetooth dongle. When I use hcitool, I can discover the SmartTag device. But when I use gatttool, I cannot connect. It says "Host is down (112)". Here are my commands: $ sudo hcitool lescan LE Scan ... BC:6A:29:AB:DE:2B (unknown) BC:6A:29:AB:DE:2B SensorTag Checking for bluetooth adapters on my RPi I get: $ hcitool dev Devices: hci0 5C:F3:70:60:E6:1B Then, when I use the gatttool like this, I get: $ sudo gatttool -i hci0 -b BC:6A:29:AB:DE:2B -I [ ][BC:6A:29:AB:DE