raspberry pi bluetooth
$ sudo adduser pi bluetooth
$ newgrp bluetooth
$ sudo adduser t-tsuji bluetooth
$ newgrp bluetooth
$ sudo shutdown -r now
$ rfkill list
$ sudo rfkill unblock bluetooth
$ sudo setcap cap_net_raw+eip $(eval readlink -f `which node`)
$ sudo systemctl status hciuart
$ sudo hciconfig hci0
$ sudo hciconfig hci0 up
$ sudo hciconfig hci0 reset
$ sudo hcitool lescan
$ bluetoothctl
$ scan on
$ node-red
#$ sudo node-red
$ sudo hcitool lescan
$ sudo gatttool -b C9:12:2F:D7:A1:D8 --interactive -t random
$ connect
$ char-write-cmd 0x0016 570100
$ char-write-cmd 0x0016 570101
$ char-write-cmd 0x0016 570102
$ sudo gatttool -b C9:12:2F:D7:A1:D8 -t random --char-write-req -a 0x0016 -n 570100
$ sudo gatttool -b C9:12:2F:D7:A1:D8 -t random --char-write-req -a 0x0016 -n 570101
$ sudo gatttool -b C9:12:2F:D7:A1:D8 -t random --char-write-req -a 0x0016 -n 570102
Reference