# emqx/emqx

The most scalable and reliable MQTT broker for AI, IoT, IIoT and connected vehicles

Repository: https://github.com/emqx/emqx
Canonical: https://ross.abutalabs.com/products/emqx
Homepage: https://www.emqx.com
Language: Erlang
License: NOASSERTION
License Family: other
Topics: mqtt, iot, mqtt-broker, erlang, iot-middleware, broker, m2m, pubsub, messaging, coap, lorawan, mqtt-server, emqx, manufacturing, mqtt-protocol, industry-40, message-queue, aiot, iiot, lwm2m
Last push: 2026-08-26T22:04:17+00:00

## Health v2 (maintenance only)
Score: 99/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 98, longevity 100
- inputs: {"age_days": 5007, "days_push": 7, "days_rel": 12, "gap_med": 15, "n_releases_24m": 34}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 16659, forks 2545 (observed 2026-08-28T04:11:16.940305+00:00)

## What it is
EMQX is a highly scalable MQTT broker and messaging platform written in Erlang, supporting MQTT 5.0/3.1.1/3.1 plus MQTT-SN, CoAP, LwM2M, and MQTT over QUIC. It connects millions of IoT devices with clustering, a SQL-based rule engine, data integrations, and built-in MCP support for AI agents.

## Use cases
- connect millions of IoT devices over MQTT
- build a scalable pub/sub message broker for IoT
- route device telemetry to databases and cloud services
- implement connected vehicle messaging infrastructure
- stream sensor data to AI agents in real time
- bridge CoAP, LwM2M, and MQTT-SN devices to MQTT
- set up a high-availability MQTT cluster for smart city or IIoT

## When to choose
- you need a production-grade MQTT broker at massive scale (100M+ connections)
- you need multi-protocol IoT connectivity (MQTT-SN, CoAP, LwM2M, QUIC)
- you want built-in rule engine and data integration without extra glue code
- you need masterless clustering and high availability

## When to avoid
- you need a fully open-source (OSI-approved) license - EMQX now uses BSL 1.1
- you only need lightweight MQTT for a few devices or embedded clients
- your messaging is not pub/sub oriented (e.g., pure request/response APIs)

## Facets
- artifact type: service
- maturity: stable
- function: message-queue, middleware, streaming, webhook, mcp
- domain: iot, microservices, artificial-intelligence
- platform: self-hosted, cloud, cross-platform
- tags: mqtt-broker, mqtt, pubsub, coap, lwm2m, lorawan, iiot, connected-vehicles, rule-engine, bsl-license, erlang, messaging, real-time, linux, docker, kubernetes

## Member repositories
- emqx/emqx (main) score 99

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:16.940305+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:04:49.125738+00:00, confidence not recorded.
  - readme: https://github.com/emqx/emqx (fetched 2026-08-28T04:11:16.940305+00:00, sha ee12b4cd436e)
  - homepage: https://www.emqx.com (fetched 2026-08-29T08:02:04.864033+00:00, sha d69f4d193a59)
  - site_page: https://www.emqx.com/en/pricing (fetched 2026-08-29T08:02:04.879838+00:00, sha 2b07d8f79861)
- Data as of 2026-08-30T08:39:29.467469+00:00.