MQTT data not showing up in datasource

Grafana Live
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1

I’m using Grafana v2.9.3 with the MQTT datasource plugin. The broker is hosted on the same server and is accessible on standard port 1883 without credentials (allow anonymous login = True).
The MQTT datasource confirms a succesful connection and when opening the Explore page it does appear to try and stream data (given the blue scrolling line above the table).

However: No data will ever show up, no matter what I post in the selected topic. Does the data require a specific format? If so what would that be?

2

My mosquitto broker is not the problem: I can succesfully stream and plot data from my broker with a grafana.com instance.

Somehow my own grafana server can connect to the mqtt server, but not receive data. What is it that could block the data from arriving?