Add lidar tracking

persontracking/lidar_servicer.py

@@ -0,0 +1,25 @@
+import lidar_tracker_pb2
+import lidar_tracker_pb2_grpc
+from .lidar_cache import LidarCache
+class LidarServicer(lidar_tracker_pb2_grpc.PersonTrackingServicer):
+
+    def __init__(self):
+        self.cache = LidarCache(measurements=100)
+        self.cache.do_scanning()
+
+    def set_tracking_group(self, request, context):
+        pass
+
+    def stop_tracking(self, request, context):
+        self.cache.stop_scanning()
+
+    def get_scan_data(self, request, context):
+        pass
+
+    def start_tracking(self, request, context):
+        '''
+        Starts the lidar cache. 
+        '''
+        pass
+
+