Owntracks

Owntracks (previously Mqttitude)

http://owntracks.org/booklet/guide/whathow/#what-owntracks-does

The OwnTracks app runs in the background on your Android or iOS device and waits for the smart phone to tell it that the device has moved, whereupon OwnTracks sends out a message with its current coordinates (and a few other things we'll discuss in a moment).

Used in OpenHab