added on_broadcast() for client-side

Drone/client.py

@@ -175,10 +175,14 @@ class Client(object):
                                               ConfigOption("SERVER", "port", self.server_port),
                                               ConfigOption("SERVER", "host", self.server_host))
                             logger.info("Binding to new IP: {}:{}".format(self.server_host, self.server_port))
+                            self.on_broadcast_bind()
                             break
         finally:
             broadcast_client.close()
 
+    def on_broadcast_bind(self):
+        pass
+
     def _process_connections(self):
         while True:
             events = self.selector.select(timeout=1)

Drone/copter_client.py

@@ -41,6 +41,10 @@ class CopterClient(client.Client):
         self.USE_LEDS = self.config.getboolean('PRIVATE', 'use_leds')
         self.LED_PIN = self.config.getint('PRIVATE', 'led_pin')
 
+    def on_broadcast_bind(self):
+        #TODO change chony config
+        _command_service_restart(name="chrony")
+
     def start(self, task_manager_instance):
         client.logger.info("Init ROS node")
         rospy.init_node('Swarm_client', anonymous=True)