Then later, the public keys (pb_key.smart_toilet and
pb_key.other_device) and the Bluetooth addresses
(bt_add.smart_toilet and bt_add.other_device) will be sent
from all devices to the mobile (main device) and
confirmed by asking the mobile to write the equivalent
passwords for all devices. The user will enter passwords
that are already assigned to these Bluetooth devices
(pass.smart_toilet and pass.other_device).