SocketTester-Native TCP, UDP & Serial Port Testing Tool

SocketTester is a lightweight native Windows tool for testing TCP, UDP, and Serial/UART/USB-COM communication. It is made for developers, embedded engineers, network testers, and anyone who needs a simple terminal-style communication tester.

What It Supports

• TCP Client
• TCP Server with multiple clients
• UDP Client
• UDP Listener/Server
• Serial/UART/USB-COM ports
• Text and HEX sending
• RX, TX, and system logs with timestamps
• Send history, repeat send, search, copy, clear, and save log
• Multiple app windows using New Session

How To Use

Select the communication type from the Communication dropdown.

• TCP Client: enter IP and port, then click Connect.
• TCP Server: select Server mode and port, then click Connect. The app binds to 0.0.0.0 automatically.
• UDP Client: enter destination IP and port, then connect and send packets.
• UDP Server: select Server mode and port to receive from any sender.
• Serial: select COM port, baud rate, data bits, stop bits, parity, and flow control, then click Open.

Send Options

• HEX: send hexadecimal bytes.
• CR / LF / CRLF: append line endings.
• Enter: press Enter to send; use Ctrl + Enter for a new line.
• Repeat: send repeatedly using the interval value.
• Clear after send: clear the send box after a successful send.

Terminal Log

[2026-05-29 17:14:13] TX  hello
[2026-05-29 17:14:15] RX  [COM7] response data
[2026-05-29 17:14:20] SYS Connected

• TX means sent data.
• RX means received data.
• SYS means connection or status message.

Other Notes

• Settings and history are saved locally in an INI file, not the registry.
• Right-click the title bar and choose New Session to open another window.