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After setting up the client side, a server-side component to receive the OwnTracks app's requests is still missing. OwnTracks ships with its Recorder, which is a small and simple web application written in C. However, I did not like it a lot, as it does not look particularly beautiful and is very limited regarding its functionality. I rather wanted to visualize my data in Grafana. But to get it there, it first needs to be persisted to a database.
The first step to tracking your location is to record it anywhere you go. As most people almost always carry their smartphones with them and as most smartphones have GNSS sensors, the choice is quite obvious. The only thing missing is an appropriate app. This is where OwnTracks comes to play. It is an open-source mobile app that does exactly what we need - record your location and send it to a custom configured MQTT broker or HTTP endpoint. It is available for both Android (written in Kotlin) and iOS (written in Objective-C) and comes with super detailed, developer-focused documentation.