Add demo device tracker platform

homeassistant/components/device_tracker/demo.py

@@ -0,0 +1,50 @@
+"""
+homeassistant.components.device_tracker.demo
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Demo platform for the device tracker.
+
+device_tracker:
+  platform: demo
+"""
+import random
+
+from homeassistant.components.device_tracker import DOMAIN
+
+
+def setup_scanner(hass, config, see):
+    """ Set up a demo tracker. """
+
+    def offset():
+        """ Return random offset. """
+        return (random.randrange(500, 2000)) / 2e5 * random.choice((-1, 1))
+
+    def random_see(dev_id, name):
+        """ Randomize a sighting. """
+        see(
+            dev_id=dev_id,
+            host_name=name,
+            gps=(hass.config.latitude + offset(),
+                 hass.config.longitude + offset()),
+            gps_accuracy=random.randrange(50, 150),
+            battery=random.randrange(10, 90)
+        )
+
+    def observe(call=None):
+        """ Observe three entities. """
+        random_see('demo_paulus', 'Paulus')
+        random_see('demo_anne_therese', 'Anne Therese')
+
+    observe()
+
+    see(
+        dev_id='demo_home_boy',
+        host_name='Home Boy',
+        gps=[hass.config.latitude - 0.00002, hass.config.longitude + 0.00002],
+        gps_accuracy=20,
+        battery=53
+    )
+
+    hass.services.register(DOMAIN, 'demo', observe)
+
+    return True