Documentation for GPSLogger (#1496)

GPSLogger merged https://github.com/home-assistant/home-assistant/pull/4089

source/_components/device_tracker.gpslogger.markdown

@@ -0,0 +1,48 @@
+
+---
+layout: page
+title: "GPSLogger"
+description: "Instructions how to use GPSLogger to track devices in Home Assistant."
+date: 2016-11-25 15:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Presence Detection
+---
+
+This platform allows you to detect presence using [GPSLogger](http://code.mendhak.com/gpslogger/). GPSLogger is an open source app for [Android](https://play.google.com/store/apps/details?id=com.mendhak.gpslogger) that allows users to set up a `GET` request to update GPS coordinates. This can be configured with Home Assistant to update your location.
+
+To integrate GPSLogger in Home Assistant, add the following section to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+device_tracker:
+  - platform: gpslogger
+```
+
+Install on your smartphone:
+
+- [Android](https://play.google.com/store/apps/details?id=com.mendhak.gpslogger)
+
+To configure GPSLogger, you must set up the app to send a `GET` request to your Home Assistant server at `http://<ha_server>/api/gpslogger?latitude=%LAT&longitude=%LON&battery=%BATT&device=%SER&accuracy=%ACC`. Make sure to include the API password if you have configured a password in Home Assistant (add `?api_password=<password>` to the end of the URL). Configure that options under "General Options":
+
+- Start on boot: yes
+- Start on app launch: yes
+
+Set the URL under "General Options -> Logging details":
+
+- Log to GPX: no
+- Log to KML: no
+- Log to custom URL: yes and set `http://<ha_server>/api/gpslogger?latitude=%LAT&longitude=%LON&battery=%BATT&device=%SER&accuracy=%ACC` (be sure you include API password (`api_password=<password>`) if needed, or you can also use HTTP Basic authentication `http://<username>:<password>@<ha_server>/api/gpslogger...`)
+- Log to OpenGTS Server: no
+- Log to Plain Text: no
+- Log to NMEA: no
+
+You should also tune GPSLogger performance to save your battery under "General Options -> Logging details -> Performance -> Location providers":
+
+- GPS: no
+- Network: no
+- Passive: yes
+
+A request can be forced from the app to test if everything is working fine. A succesfull request will update `known_devices.yaml` with device serial number.