ESP8266MQTTMesh
A self-assembling mesh network library for ESP8266 devices using MQTT for communication and supporting over-the-air updates.
What is ESP8266MQTTMesh?
ESP8266MQTTMesh is an Arduino library that creates a self-assembling mesh network for ESP8266 microcontrollers, using MQTT as the communication protocol. It allows multiple devices to connect and relay messages through a central MQTT broker, even if only one node has direct WiFi access. The library also supports over-the-air firmware updates, enabling remote management of distributed IoT nodes.
IoT developers and hobbyists building distributed sensor networks or home automation systems with ESP8266 devices, particularly those using platforms like Sonoff relays.
Developers choose ESP8266MQTTMesh for its automatic mesh formation, seamless MQTT integration, and built-in OTA update capabilities, which simplify deploying and maintaining networks of ESP8266-based devices without manual configuration.
Overview
Self-assembling Mesh network built around the MQTT protocol supporting OTA
Use Cases
Best For
- Building distributed home automation systems with ESP8266 devices
- Creating self-healing sensor networks in environments with limited WiFi coverage
- Deploying over-the-air updates to remote IoT nodes via MQTT
- Developing IoT projects with Sonoff relays or similar ESP8266 boards
- Setting up mesh networks for data aggregation in industrial monitoring
- Prototyping scalable IoT infrastructures with centralized MQTT communication
Not Ideal For
- Projects requiring ongoing maintenance and active community support, as the library is no longer actively developed since 2020.
- IoT devices with less than 1MB of flash memory, especially when SSL encryption is enabled, due to firmware size constraints that can break OTA updates.
- Developers needing cross-platform support for ESP32 or other microcontrollers, as it's strictly designed for ESP8266 with specific core dependencies.
- Applications prioritizing low-latency, direct peer-to-peer communication, since all messages are routed through a central MQTT broker, adding overhead.
Pros & Cons
Pros
Nodes self-assemble via hidden access points without manual configuration, enabling quick deployment in distributed networks as highlighted in the self-assembling mesh feature.
All communication routes through an MQTT broker, simplifying message handling and logging from a single point, which is core to the library's design for home automation.
OTA updates are broadcast via MQTT but only applied to nodes with matching firmware IDs, allowing flexible firmware deployment across heterogeneous devices, as detailed in the OTA section.
Built on asynchronous communication libraries like AsyncMqttClient, improving reliability by preventing network blocking, as recommended in the prerequisites for better performance.
Cons
The author stated in 2020 that they no longer have resources to work on it, with several unresolved issues, making it risky for production use without community contributions.
Enabling SSL adds approximately 70kB to firmware size, which can exceed flash limits on ESP8266 boards and potentially prevent OTA updates, as explicitly warned in the README.
Setting up SSL requires manual certificate generation with provided scripts and careful configuration, increasing implementation complexity and error-prone steps.
Requires Arduino ESP8266 Core version 2.4 and other asynchronous libraries, which can lead to compatibility issues with newer toolchains or other projects.
Frequently Asked Questions
Related Projects
pubsubclientA client library for the Arduino Ethernet Shield that provides support for MQTT.
ESP_mqttMQTT client library for ESP8266
ESP32-BLE2MQTTA BLE to MQTT bridge running on an ESP32
Found a gem we're missing?
Open-Awesome is built by the community, for the community. Submit a project, suggest an awesome list, or help improve the catalog on GitHub.