diff --git a/main.py b/main.py
index 4b7042b..c65b9c4 100644
--- a/main.py
+++ b/main.py
@@ -123,7 +123,12 @@ class Sensor():
             'tags': {'id': self.id_, 'name': self.name},
             'fields': data,
         }
-        sensors_client.write_points([point])
+
+        try:
+            sensors_client.write_points([point])
+        except requests.exceptions.ConnectionError:
+            logging.exception('Error connecting to InfluxDB!')
+            return
 
         logging.info('Wrote %s data to InfluxDB: %s', self, data)
 
@@ -174,6 +179,11 @@ class ERTSCMSensor(Sensor):
     ]
     update_period = 60*60
 
+    def transform(self, data):
+        # new gas meter
+        if 'Consumption' in data:
+            data['consumption_data'] = data['Consumption']
+
 class OwnTracksSensor(Sensor):
     type_ = 'owntracks'
     bad_keys = [
@@ -280,7 +290,11 @@ async def process_data(data):
         sensor.update(data)
 
 async def process_mqtt(message):
-    text = message.payload.decode()
+    try:
+        text = message.payload.decode()
+    except UnicodeDecodeError:
+        return
+
     topic = message.topic
     logging.debug('MQTT topic: %s, message: %s', topic, text)
 
@@ -321,9 +335,15 @@ async def owntracks(request):
     return web.Response()
 
 async def history(request):
+    api_key = request.rel_url.query.get('api_key', '')
+    authed = api_key == settings.SENSORS_API_KEY
+
     measurement = request.match_info.get('measurement')
     name = request.match_info.get('name')
 
+    if not authed and measurement in ['owntracks', 'sleep']:
+        return web.json_response([])
+
     if name not in [x.name for x in sensors.sensors]:
         raise
 
@@ -356,7 +376,7 @@ async def history(request):
         raise
 
     window = request.rel_url.query.get('window', window)
-    if window not in ['10m', '1h', '1d', '7d', '30d']:
+    if window not in ['1m', '3m', '10m', '1h', '2h', '1d', '7d', '30d']:
         raise
 
     if name == 'Water':
@@ -393,6 +413,9 @@ async def history(request):
     elif measurement == 'solar':
         client = solar_client
         q = 'select max("actual_total") as actual_total, last("lifetime_energy")-first("lifetime_energy") as lifetime_energy from ecu where time >= {}s and time < {}s group by time({}) fill(linear)'.format(start, end, window)
+    elif measurement == 'owntracks':
+        client = sensors_client
+        q = 'select first("lat") as lat, first("lon") as lon from owntracks where "acc" < 100 and "name" = \'{}\' and time >= {}s and time < {}s group by time({}) fill(previous)'.format(name, start, end, window)
     else:
         raise
 
@@ -411,7 +434,7 @@ async def latest(request):
         if sensor.type_ in ['solar']:
             continue
 
-        if not authed and sensor.type_ in ['owntracks']:
+        if not authed and sensor.type_ in ['owntracks', 'sleep']:
             continue
 
         q = 'select * from {} where "name" = \'{}\' order by desc limit 1'.format(sensor.type_, sensor.name)
@@ -426,7 +449,7 @@ async def latest(request):
     return web.json_response(result)
 
 async def index(request):
-    return web.Response(text='hello world', content_type='text/html')
+    return web.Response(text='sensors api', content_type='text/html')
 
 async def run_webserver():
     #web.run_app(app, port=PORT, loop=loop)
@@ -456,7 +479,7 @@ if __name__ == '__main__':
 
     sensors.add(ThermostatSensor('thermostat2', '192.168.69.152', 'Venstar'))
     sensors.add(ERTSCMSensor('31005493', 'Water'))
-    sensors.add(ERTSCMSensor('41249312', 'Gas'))
+    sensors.add(ERTSCMSensor('78628180', 'Gas'))
     sensors.add(OwnTracksSensor('owntracks1', 'OwnTracks'))
     sensors.add(AirSensor('air1', 'Living Room'))
     sensors.add(Acurite606TX('59', 'Outside'))