See applications that show how two Web-IO devices can communicate with each other over the Ethernet.

Applications for Box to Box

Box-2-Box via MQTT with Web-IO 4.0

This step-by-step manual explains the setup of Box-2-Box operation of the Web-IO 4.0 Digital via the Internet of Things. 
In Box-2-Box mode you connect two Web-IOs together so that switching signals present on the inputs of the one device are transmitted via MQTT to the outputs on the other device. The broker is CloudMQTT, a commercial, free provider for smaller applications.
To familiarize yourself with MQTT we recommend the page "Communication in the Internet of Things."

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