bluetoothctl

power on

pairable on

agent on

default agent

default-agent scan on pair

trust quit

sudo rfcomm bind rfcomm0

screen /dev/rfcomm0

atz

atl1

ath1

atsp0

010D --> speed 012F --> fuel level

edit /etc/rc.local

rfcomm bind rfcomm99

vim /etc/systemd/system/dbus-org.bluez.service

add