Configuring a dumb, insecure Bluetooth connection

Just connect the thing, no more passphrase stuff requiring action on the target system.

$bluetoothctl
[bluetooth]# power on
Changing power on succeeded
[bluetooth]# discoverable on
Changing discoverable on succeeded
[bluetooth]# pairable on
Changing pairable on succeeded
[bluetooth]# agent NoInputNoOutput
Agent registered
[bluetooth]# default-agent 
Default agent request successful

https://stackoverflow.com/questions/34709583/bluetoothctl-set-passkey