2 open source projects by flespi-software

Arduino IDE project: send data from DS18B20 temperature sensor to mqtt.flespi.io via MQTT over SSL.

Diagnostic-oriented MQTT client tool. Supports MQTT 5.0 and 3.1.X protocols, connections to multiple brokers, MQTT operations logs and multiple subscribe widgets with unique/history topic filtering mode. Saves configuration in browser's local cache.