LinkJig: Serial, BLE & TCP

A serial tool built for repeatable device testing, not just a terminal. No ads in the tool, no account, no cloud, no analytics.

LinkJig talks to your device over USB serial, Bluetooth Low Energy or TCP — then turns the conversation into a repeatable pass/fail test.

Built for embedded developers, hardware testers and makers who are tired of juggling a serial terminal, a BLE app and a socket tool, and of typing the same commands every day.

REPEATABLE DEVICE TESTS

• Scenarios: send a command, wait for the expected reply, get PASS or FAIL for every step

• Timeouts, retries, on-fail actions and loop counts

• Failed steps show exactly where the reply differed from what you expected

• Save results as TXT or CSV

READY-MADE MODULES

• ESP8266 module included free: create a Wi-Fi network, join one or open a TCP server by filling in a form

• 100 commands with explanations, plus troubleshooting; every command stays visible in the terminal

• Tested on real hardware: ESP-12E, AT 2.2.0.0

SEE EVERY BYTE BEFORE IT LEAVES

• Live byte preview of what goes on the wire, with checksum/CRC bytes highlighted

• Send as ASCII with escapes, HEX, decimal or binary; custom line endings

• CRC-8/16/32, Modbus, XOR and sum checksums, appended automatically or calculated by hand

ONE APP, SEVERAL LINKS

• USB serial over OTG: CDC-ACM, CP210x, CH34x, FTDI and PL2303 adapters

• Bluetooth LE: Nordic UART, HM-10 and Microchip profiles detected automatically, GATT explorer for everything else

• TCP client for Wi-Fi modules and network devices

• Built-in demo device to try everything without hardware

A TERMINAL THAT KEEPS UP

• ASCII, HEX, decimal, binary and dump views, timestamps, search, pause

• Smooth at 921600 baud; packets split by line ending or time gap

• Macros, triggers that auto-reply to simulate a device, highlight rules

• Logs you can save and share

BUILD ON THE DESKTOP, RUN IN THE FIELD

Prepare scenarios, macros and profiles in the free Windows app, share them as one project pack file, and open it on your phone.

PRIVATE BY DESIGN

No account, no analytics. Your terminal data stays on your device.

NO ADS IN THE TOOL, PRO IS FREE

No ads in the tool. Ads appear only in the optional Start Bit mini game. Pro is free: reach level 15 in the game or watch a few short ads.

USB serial needs a phone with USB host (OTG) support. No root required.

Built by an embedded engineer.