RTK信息增加一个rtcm数据长度字段

endian11

2021-02-03 94764c8945a50e0758ab448d5601a22caa6a73fe

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{"road_total_distance":3000,"road_max_speed":60,"stop_car_open_door_allow_time":15,"stop_car_limit_distance":150,"stop_car_edge_red_distance":0.5,"stop_car_edge_yellow_distance":0.3}