Scalable, fault-tolerant, and durable messaging for millions of MQTT clients.
TBMQ is an open-source MQTT broker built by the ThingsBoard team for large-scale IoT: scalable, fault-tolerant and durable messaging for millions of MQTT 3.x and 5.0 clients. It runs as a masterless cluster — Apache Kafka carries every message and state change between nodes, Redis (or Valkey) queues messages for persistent devices, and PostgreSQL stores metadata — so capacity grows by adding nodes and no publish is acknowledged before it is persisted. Measured at 100M+ concurrent connections and 3M+ messages per second, and free under the Apache 2.0 license.
Start with the public demo broker below, then continue to the architecture, installation, security and client management sections.
Use the free public MQTT broker — no installation required.
Host: demo.tbmq.io
TCP Port: 1883
TLS Port: 8883
Username: demo
Password: (leave empty)
# Subscribe to a topicmosquitto_sub -d -h demo.tbmq.io -p 1883 -q 1 \ -t sensors/temperature -u demo# Publish a messagemosquitto_pub -d -h demo.tbmq.io -p 1883 -q 1 \ -t sensors/temperature -m 25 -u demoTBMQ architecture — distributed cluster design built for scale and resilience.