This required option specifies the address of the remote RFCOMM server. The address can be specified as BD_ADDR or name. If name was specified then the rfcomm_sppd utility will attempt to resolve the name via bt_gethostbyname(3).
Detach from the controlling terminal, i.e., run in background.
This option specifies RFCOMM channel to connect to. The channel must provide Serial Port service. If channel was not specified then rfcomm_sppd utility will try to obtain RFCOMM channel via Service Discovery Protocol from the server.
Display usage message and exit.
Slave pseudo tty name. If not set stdin/stdout will be used. This option is required if -b option was specified.