create_messages_layer

svc=render/create_messages_layer&params={"layerName":"<text>",
					 					 "itemId":<long>,
					 					 "timeFrom":<uint>,
					 					 "timeTo":<uint>,
					 					 "tripDetector":<bool>,
					 					 "trackColor":"<text>",
					 					 "trackWidth":<int>,
					 					 "arrows":<bool>,
					 					 "points":<bool>,
					 					 "pointColor":"<text>",
					 					 "annotations":<bool>,
					 					 "flags":<uint>}

{
	"name":"<text>",	/* layer name */
	"bounds":[		/* layer bounds */
		<double>,	/* minimum latitude */
		<double>,	/* minimum longitude */
		<double>,	/* maximum latitude */
		<double>	/* maximum longitude */
	],
	"units":[		/* array of units */
		{
			"id":<long>,			/* unit ID */
			"msgs":{				/* information about messages */
				"count":<uint>,		/* messages count */
				"first":{			/* first message */
					"time":<uint>,	/* time */
					"lat":<double>,	/* latitude */
					"lon":<double>	/* longitude */
				},
				"last":{			/* last message */
					"time":<uint>,	/* time */
					"lat":<double>,	/* latitude */
					"lon":<double>	/* longitude */
				}
			},
			"mileage":<double>,		/* mileage for interval (metres) */
			"max_speed":<unit>		/* maximum speed for interval */
		}
	],
	"trips":[	/* only if tripDetector is 1 */
		{
			"first":{ /* first message */ 
				"time":<uint>, /* time */ 
				"lat":<double>, /* latitude */ 
				"lon":<double> /* longitude */ 
			}, 
			"last":{ /* last message */ 
				"time":<uint>, /* time */ 
				"lat":<double>, /* latitude */ 
				"lon":<double> /* longitude */ 
			},
			"mileage":<double>, /* mileage for interval (metres) */ 
			"max_speed":<unit> /* maximum speed for interval */
			"color":"<text>" /* interval colour in '#RRGGBB' format */ 
		}
	]
}