Instead of printing messages in parallel to the UDP package sending,
move the printing to after the UDP server block. This make it both
possible to disable message printing by changing the server port to a
different value from the client port, and to print messages collected
by several clients by pointing all clients to the same server.
Change adressing #140 enhancement request.
It is possible to select rtl-sdr dongle:
-with device index through commanline parameter: `--args="rtl=1"` (where 1 is the device index). Caution: device index is not unique identifier and it changes on each connection of the dongle.
-with devices serial number, the commandline option in this case has following form: `--args="rtl=00000001"` (where 00000001 is the serial number).
NOTE: You can set the serial number with use of:
```sh
rtl_eeprom -s <serial_number>
```
Piotr Krysik