emqx/emqx

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

16659 stars · 2545 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

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

service · maturity stable

message-queue middleware streaming webhook mcp iot microservices artificial-intelligence self-hosted cloud cross-platform mqtt-broker mqtt pubsub coap lwm2m lorawan iiot connected-vehicles rule-engine bsl-license erlang messaging real-time linux docker kubernetes

Member repositories

For agents

markdown · JSON · MCP: product_card(name="emqx/emqx")