Add schema

content/post/monitoring-iot-devices-with-MASH.md

@@ -39,6 +39,8 @@ The documentation IMHO is very good, so if people are willing to use ansible thi
 
 In the end we will have a IoT device that sends data to a MQTT topic on the MQTT broker Mosquitto. Telegraf will listen to this topic and write this into InfluxDB. When you want to have a look at the data, you can access Grafan which will query InfluxDB.
 
+![A schema showing a setup where an IoT sensor sends data via MQTT to an MQTT broker. Telegraf subscribes to this broker and writes the data into InfluxDB. Grafana reads from InfluxDB when you want to view the data](/uploads/monitoring-iot-devices-with-MASH/mash-monitoring-mqtt.png)
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 # Prerequisits
 
 To have everything it needs to use MASH you should ensure the following things are done and working