If you want to know how’s the signal with your bluetooth device maybe you want to make a ping to it, like common ping used in IP networks.
So, for make it in bluetooth networks we have to use l2ping, for example:
# l2ping 00:11:C0:19:C9:C1
Ping: 00:11:C0:19:C9:C1 from 00:1A:6B:DC:F1:A1 (data size 44) ...
44 bytes from 00:11:C0:19:C9:C1 id 0 time 14.61ms
44 bytes from 00:11:C0:19:C9:C1 id 1 time 48.58ms
