New scalable, fault-tolerant, and efficient open-source MQTT broker

• tbmq

  2 547 9.6 Java

  Open-source, scalable, and fault-tolerant MQTT broker able to handle 4M+ concurrent client connections, supporting at least 3M messages per second throughput per single cluster node with low latency delivery. The cluster mode supports more than 100M concurrently connected clients.

  

• rumqtt

  34 1,473 8.9 Rust

  The MQTT ecosystem in rust

  

https://github.com/bytebeamio/rumqtt

Disclaimer: have not tried it myself. I was, however, considering using it to replace Mosquitto as a broker.

• InfluxDB

  www.influxdata.com sponsored

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• EmbeddedMqttBroker

  1 61 4.1 C++

  This is a Mqtt broker for embedded devices, developed in C++, FreeRTOS to use advanced multitasking capabilities, and arduino core. Tested in an Esp32 and esp8266.

• TinyMqtt

  3 176 5.9 C++

  ESP 8266 / 32 / WROOM Small footprint Mqtt Broker and Client

Several different implementations exist, MQTT is a very lightweight protocol so this is very possible.

https://github.com/hsaturn/TinyMqtt

• Mongoose

  32 10,589 9.6 C

  Embedded Web Server (by cesanta)

  

• NATS

  106 14,720 9.8 Go

  High-Performance server for NATS.io, the cloud and edge native messaging system.

  

Why wasn't NATS[1] used ?

Written in Go, single-binary deployment... there's a lot to love about NATS !

[1]https://nats.io/

• Netty

  53 32,765 9.6 Java

  Netty project - an event-driven asynchronous network application framework

  

We use Netty (https://netty.io/) as the source of the MQTT communication, and we build the MQTT features the MQTT broker should support ourselves on top of that.

• WorkOS

  workos.com sponsored

  The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

  

• vernemq

  5 3,146 8.6 Erlang

  A distributed MQTT message broker based on Erlang/OTP. Built for high quality & Industrial use cases. The VerneMQ mission is active & the project maintained. Thank you for your support!

  

Shameless plug since i'm a contributor but VerneMQ [1] is a pretty programmable one. You have options from using webhooks to writting your plugins in Lua or Erlang/Elixir.

* https://github.com/vernemq/vernemq

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