WiFi Sensor User Guide for use with MQTT Introduction MQTT allows the complete line of NCD WiFi sensors to communicate via the internet to any MQTT Broker service using a WiFi connection. It only requires network connection credentials, connection information about the MQTT Host Broker, and authentication information for the MQTT connection if applicable. The WiFi Sensor for MQTT supports connection to MQTT Brokers via open connection, basic authentication, as well as TLS. Topics and message payload formats are fully customizable for compatibility with each MQTT Broker service. WiFi communication is also fully encrypted for the security of each device.