rctest is used to test RFCOMM communications on the BlueZ stack
-r listen and receive
-w listen and send
-d listen and dump incoming data
-s connect and send
-u connect and receive
-n connect and be silent
-c connect, disconnect, connect, ...
-m multiple connects
-b bytes send/receive bytes bytes
-i device select the specified device
-P channel select the specified channel
-U uuid select the specified uuid
-L seconds enable SO_LINGER options for seconds
-W seconds enable deferred setup for seconds
-B filename use data packets from filename
-N num send num frames
-C num send num frames before delay (default: 1)
-D milliseconds delay milliseconds after sending num frames (default: 0)
-A request authentication
-E request encryption
-S secure connection
-M become master
-T enable timestamps
