'cat /dev/rfcomm0' yields strange data

# rfcomm watch /dev/rfcomm0 1 muahahahah
Waiting for connection on channel 1
Connection from xxx to /dev/rfcomm0
Press CTRL-C for hangup


on another terminal:


# cat /dev/rfcomm0

^J^J^J
^J^J^J



^J



^J



^J^J



^^J
...
...

and these character output goes on and on for a minute or so until it stops.

Any idea what is it ? is it supposed to be here ?
I was expecting the 'cat' command to show me only data that was sent
from the remote end
(e.g. If I do on the remote peer 'echo bla > /dev/rfcomm0' I do see
the bla here on the local 'cat').

thank you for the help
naziir