rxecho.conf - control rxecho AX.25 packet routing.
Rxecho.conf controls the copying of packets between AX.25 ports
performed by the program rxecho. The format of the configuration file
portin portout * | callsign...
Each entry in the file represents a one-way packet flow between ports.
Any packet received on portin is copied to portout, if its destination
callsign or the next callsign to digipeat the frame is in the list of
callsigns. If the callsign list is replaced by a “*” then all packets
are copied. The configuration file may contain comments that begin
with a #.