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-mkdir build
-cd build
-cmake -DCMAKE_INSTALL_PREFIX=.... ..
-make
-make install
+# GPS Service
-# Start the binder
+## Overview
-```
-afb-daemon --token=x --ldpaths=. --port=5555 --rootdir=. --verbose --verbose --verbose --verbose --verbose
-```
+GPS service reports current WGS84 coordinates from GNSS devices via the gpsd application.
-# Environment variables
+## Verbs
-* AFBGPS_HOST : hostname to connect to
-* AFBGPS_SERVICE : service to connect to (tcp port)
-* AFBGPS_ISNMEA : 0/1 - does the frames are NMEA or not
+| Name | Description | JSON Parameters |
+| ------------------ |:----------------------------------------|:----------------------------------------------------|
+| subscribe | subscribe to gps/gnss events | *Request:* {"value": "location"} |
+| unsubscribe | unsubscribe to gps/gnss events | *Request:* {"value": "location"} |
+| location | get current gps/gnss coordinates | See **location Event JSON Response** section |
+| record | start/stop recording gps data | See **Recording/Replaying Feature** section |
+## Events
+
+| Name | Description |
+| ------------------ |:----------------------------------------|
+| location | event that reports gps/gnss coordinates |
+
+### location Event JSON Response
+
+| Parameter Name | Description |
+|----------------|:-------------------------------------------------------------|
+| altitude | altitude in meters |
+| latitude | latitude in degrees |
+| longitude | longitude in degrees |
+| speed | velocity in meters per second |
+| track | heading in degrees |
+| timestamp | timestamp in ISO8601 format *(example: 2018-01-25T13:15:22)* |
+
+## Recording/Replaying Feature
+
+Entering *record* mode you must send **{"state": "on"}** with the **record** verb which will have a JSON response of
+**{"filename": "gps_YYYYMMDD_hhmm.log"}** pointing to log under *app-data/agl-service-gps*
+
+Now to enter *replaying* mode you must symlink or copy a GPS dump to *app-data/agl-service-gps/recording.log* and restart
+the service. From then on out the previously recorded GPS data will loop infinitely which is useful for testing or
+demonstration purposes.
+
+## Environment variables
+
+| Name | Description |
+|-----------------|:---------------------------------|
+| AFBGPS\_HOST | hostname to connect to |
+| AFBGPS\_SERVICE | service to connect to (tcp port) |