Visualizing Smog Sensor Data with the help of Vert.x, Prometheus, and Grafana – RHD Blog

https://developers.redhat.com/blog/2017/07/06/visualizing-smog-sensor-data-with-the-help-of-vert-x-prometheus-and-grafana/?sc_cid=7016000000127ECAAY

The article shows an end-to-end example of an IoT device sending data in a certain format. A gateway is implemented with the help of the Vert.x framework, which does all the magic of connection handling etc.
Finally, the data is stored in a Prometheus time series database and graphed via Grafana.