Eclipse Mosquitto vs EMQX

Eclipse Mosquitto is a free, open-source message broker for MQTT 5.0, 3.1.1 and 3.1. It uses publish/subscribe messaging, a pattern suited to connected devices such as sensors, phones, embedded computers and microcontrollers. The project describes it as lightweight, with applications from low-power single-board computers to full servers. Mosquitto runs on Linux, macOS, Windows and self-hosted environments. The project also provides a C library for MQTT clients and the mosquitto_pub and mosquitto_sub command-line tools. MQTT and MQTT over WebSockets are supported, and delivery guarantees are configurable. A public test server offers plain MQTT, TLS, client-certificate TLS and WebSocket options. The project lists manufacturing, healthcare, automotive and smart-home systems among broker application areas. Community support is best effort through GitHub, a mailing list, Matrix and Cedalo forums. Cedalo offers hosted or on-premises instances, consulting and custom development.

EMQX is an MQTT messaging platform for connecting, moving, and processing IoT business data in real time. EMQX Enterprise combines publish/subscribe messaging with durable message queuing, while a SQL-based Rule Engine and visual Flow Designer support filtering, transforming, enriching, and routing data. The platform supports MQTT and protocols or gateways including QUIC, CoAP, STOMP, and LwM2M; its listed protocols also include MQTT-SN, OCPP, GB/T 32960, JT/T 808, and NATS. EMQX says a cluster can handle up to 100 million concurrent MQTT connections and lists more than 50 native integrations. Security features include TLS/mTLS, X.509 authentication, access controls, and audit logs. Deployment options include Docker, a Kubernetes Operator, and installation packages, with macOS and Linux packages listed. Plans include free Serverless and Dedicated Flex starting at $234 per month, with a 14-day trial listed for Dedicated Flex. Serverless has limits including 1,000 sessions, 1,000 TPS, and a 1 MB message size.