I've done a bit of playing and it appears you get a JSON string like this :-
{"device":{"Model Name":"Vigor2927Lac","MAC":"1449bcxxxxxx"},"Status":{"Uptime":"4388","Memory":"80","CPU":"2","WAN1_status":"UP","WAN2_status":"DOWN","WAN3_status":"DOWN","WAN4_status":"DOWN","WAN5_status":"DOWN","WAN6_status":"DOWN"}}