PortListener

Listen the TCP/UDP ports and Sockets and do something with received data.

The PortListener contains:

• desktop application
• win-service / linux daemon

PortListener Desktop version (PLDesk)

The PortListener boasts the following features:

• any number of TCP/UDP/Socket listeners
• display payloads as text or binary data
• make reply (no reply, echo, predefined string)

PortListener Service version (PLService)

Command line arguments:

• -i (-install) Install the service.
• -u (-uninstall) Uninstall the service.
• -e (-exec) Execute the service as a standalone application (useful for debug purposes). This is a blocking call, the service will be executed like a normal application. In this mode you will not be able to communicate with the service from the contoller.
• -t (-terminate) Stop the service.
• -p (-pause) Pause the service.
• -r (-resume) Resume a paused service.
• -c cmd (-command cmd) Send the user defined command code cmd to the service application.
• -v (-version) Display version and status information.

Without arguments start the service

How to send packet to port

To send an UDP packet to port:

echo <packetContent> | socat -t 5 - udp:<dstIp>:<dstPort>

This sends the packet and prints any packets coming back from there; if none arrive, it quits after 5 seconds (-t 5).

To send an TCP packet to port:

echo <packetContent> | socat -t 5 - tcp:<dstIp>:<dstPort>

To send any packet to socket:

echo <packetContent> | socat -t 5 - UNIX-CONNECT:/path/to/any.sock

UDP packet csv-to-db example:

echo 'counters:"KBB20CQ001_D11";"1.0";"266466.2";"133233.1";"266466.0";"2023-07-18-10:47:54:222"' | socat -t 5 - udp:localhost:2424

To send modbus packet use any ModbusMasterClient. Values to test:

• [41f2 6666] -> 30.300
• [4221 999a] -> 40.400
• [4121 999a] -> 10.100