How to Build an Industrial IoT Project with NetRelay and MQTT

Why use MQTT?

MQTT is widely used in IoT projects because its publish-subscribe structure operates efficiently with low bandwidth. NetRelay can publish temperature, humidity, digital input and relay status data to defined topics.

Sample application

In a cold storage facility, NetRelay devices installed in separate rooms send temperature data to a central MQTT broker. Management software collects the information on a single dashboard. When a threshold is exceeded, a fan or alarm can be activated through the relevant relay.

Important configuration points

The broker address, port, client ID, credentials and topic structure should be planned carefully. State retention, reconnect behaviour and secure network access must also be considered at the beginning of the project.

With MQTT, HTTP and WebSocket support, NetRelay can be integrated into existing software through multiple communication methods.