old_contents: control_host = "127.0.0.1"
  
  drone1 = {
  				'host' : 						"192.168.1.1",	# NB - this is the IP which should be set on the drone
  				'at_port' : 						5556,
  				'nav_port' : 						5554,
  				'vid_port' : 						5555,
  				'config_port' :						5559,
  				'control_port' : 					5560,
  				'control_data_port' :				5561,
  				'video_data_port' : 				5562,
  				'control_data_listening_port' :		3456,
  				'video_data_listening_port' :		3457,
  				};
  				
  drone2 = {
  				'host' :						"192.168.2.1",	# NB - this is the IP which should be set on the drone
  				'at_port' :							5656,
  				'nav_port' :						5654,
  				'vid_port' : 						5655,
  				'config_port' :						5659,
  				'control_port' :					5660,
  				'control_data_port' :				5661,
  				'video_data_port' :					5662,
  				'control_data_listening_port' :		3556,
  				'video_data_listening_port' :		3557,
  				};
  
  
new_contents: drone1 = {
  				'host' : 						"192.168.1.1",	# NB - this is the IP which should be set on the drone
  				'control_host' :				 "127.0.0.1",
  				'at_port' : 						5556,
  				'nav_port' : 						5554,
  				'vid_port' : 						5555,
  				'config_port' :						5559,
  				'control_port' : 					5560,
  				'control_data_port' :				5561,
  				'video_data_port' : 				5562,
  				'control_data_listening_port' :		3456,
  				'video_data_listening_port' :		3457,
  				'bind_host':						'192.168.1.2',
  				};
  				
  drone2 = {
  				'host' :						"192.168.2.1",	# NB - this is the IP which should be set on the drone
  				'control_host' :				 "127.0.0.1",
  				'at_port' :							5556,
  				'nav_port' :						5554,
  				'vid_port' : 						5555,
  				'config_port' :						5659,
  				'control_port' :					5660,
  				'control_data_port' :				5661,
  				'video_data_port' :					5662,
  				'control_data_listening_port' :		3556,
  				'video_data_listening_port' :		3557,
  				'bind_host':						'192.168.2.2',
  				};
  
  
subject: add bind host for drone 1 and drone 2