Update README.md

Author: janvda

README.md

@@ -2,12 +2,13 @@
 
 This repository describes a composite docker application that monitors the system resources of the device where it is deployed on.  This application can be deployed through [BalenaCloud](https://www.balena.io/) on any arm device (e.g. a raspberry pi) running the [balena OS](https://www.balena.io/os/).
 
-It consists of the following four docker containers (= TIG stack + nginx)
+It consists of the following 5 docker containers (= TIG stack + Node-RED + nginx )
 
 1. [Telegraf](https://www.influxdata.com/time-series-platform/telegraf/) - agent for collecting and reporting metrics and events
 2. [Influxdb](https://www.influxdata.com/) - Time Series Database
 3. [Grafana](https://grafana.com/) - create, explore and share dashboards
-4. [nginx](http://nginx.org/en/docs/) - configured as reverse-proxyserver so that the http/https request becomes routed to grafana (port 30000).
+4. [Node-RED](https://nodered.org/) - flow based programming for the Internet of Things (accessible through path `/nodered` )
+4. [nginx](http://nginx.org/en/docs/) - configured as reverse-proxyserver so that the http/https request becomes routed to grafana (port 30000) and the http/https request for path `/nodered` become routed to node-red (port 1880).
 
 The Grafana user interface can directly be accessed (login and password is `admin`) at port 80 of the host OS thanks to reverse-proxyserver ningx.  This also means that you can access it through the `public device URL` that you can find in your [BalenaCloud](https://www.balena.io/) dashboard.  In other words you can access your Grafana dashboards wherever you have internet access !