Eclipse Mosquitto

Eclipse Mosquitto is an open source (EPL/EDL licensed) project of the Eclipse Foundation that provides a lightweight MQTT message broker supporting MQTT 5.0, 3.1.1 and 3.1. The project also supplies a C client library (libmosquitto), the mosquitto_pub, mosquitto_sub and mosquitto_rr command line clients, and a public test broker at test.mosquitto.org. Development is driven and sponsored by Cedalo AG, which offers commercial support, hosting, consulting and the Pro Edition for Mosquitto.