This is a simple command line application for testing communication over network. I created this for testing communication between remote client application and server hidden behind NAT accessible via port forwarding.
JRE 8
Start server with TCP or UDP ports openned and then start client and check connection.
Start server listening on ports 1001,1002,1003,1004,1005 and 1020
java -jar pct.jar listen tcp 1001-1005,1020
Connect client same way
java -jar pct.jar connect 127.0.0.1 tcp 1001-1005,1020
Call java -jar pct.jar help to get help printed