Displays or modifies the destination callsign, and digipeater
path for "unproto" broadcasts from applications on this port.
If "path" is not specified, the current path (i.e. destination
and digipeater callsigns) is displayed.
If "path" is specified, the UNPROTO parameter for the specified
port is changed to the new value.
The "path" argument should be supplied in the form
<destcall>[,digicall,digicall,...]
where <destcall> is the destination (i.e. "to") callsign, and
[digicall] are optional digipeater callsigns.
The minimum abbreviation of this command is UN.