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This article is about monitoring some IoT devices (e.g. a CO2 sensor) with a combination of Mosquitto (a MQTT broker), Telegraf (a metric collector), InfluxDB (a time-series database) and Grafana (for displaying everything nicely). All mentioned services should run on a server that can be reached from the monitoring device(s) and your PC where you want to check the data. We will use MASH (see below) to deploy the services.