Bridge

Technological

Components

• Network-compatible microcontroller

  • ESP8266

• Radio module (must be the same as on the sensor board node)

  • RFM69 radio module

Functionality

The bridge is receiving the sensor boards’ data from the radio module. For that matter the boards’ UUID and the sensors’ current measured data are transferred as a JSON-LD. Afterwards the bridge is building a connection to the gateway and is requesting the linked RDF-data of the associated UUID. According to these RDF-data the MQTT-URI is generated. After that the bridge is publishing the measured data via the particular topic to the MQTT-broker.

Example of the circuit boards’ layout

This picture is showing a possible layout of the bridge. The RFM69 was used as radio module and the ESP8266 as microcontroller.