serial2mqtt
A Linux gateway that bridges serial communication (USB, serial, Bluetooth) to MQTT, enabling MQTT for microcontrollers without Ethernet or WiFi.
What is serial2mqtt?
serial2mqtt is a Linux gateway that enables MQTT communication for microcontrollers lacking Ethernet or WiFi connectivity. It reads JSON-formatted commands from serial ports (USB, UART, Bluetooth) and translates them into MQTT publish/subscribe operations, bridging low-cost embedded devices to MQTT brokers. It solves the problem of integrating simple, serial-only microcontrollers into modern IoT ecosystems without requiring network hardware on the device itself.
Embedded developers and IoT hobbyists working with low-cost microcontrollers (e.g., STM32, ESP32 in serial mode) who need to integrate these devices into MQTT-based smart home or industrial automation systems without adding network hardware.
Developers choose serial2mqtt because it provides a lightweight, self-hosted gateway that eliminates the need for Ethernet/WiFi modules on microcontrollers, significantly reducing device cost and complexity. Its event-driven design, support for dynamic serial port management, and optional over-the-air firmware flashing offer a flexible and robust solution for serial-based IoT projects.
Overview
Implement a Linux gateway that reads serial port ( USB, serial , bluetooth) commands and transfers to MQTT host. MQTT without ethernet or Wifi on a low cost micocontroller. Don't develop a serial command interface , just use MQTT UI's and features.
Use Cases
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