Node-RED block in Snap4City Microservice library node-red-contrib-snap4city-tunnel is "edge-tunnel-to-cloud">
If you are using our nodes on your linux PC (e.g. Raspberry PI) and not on our platform, inserting this node into your flow and deploying the flow creates a tunnel between the platform and your device. Then you can connect to the Node-RED of your device directly from the Snap4city platform.