RTK信息增加一个rtcm数据长度字段

endian11

2021-02-03 94764c8945a50e0758ab448d5601a22caa6a73fe

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{"gear_n_allow_time":5,"same_gear_min_time":5,"gear_speed_error_cumulative_time":15,"gear_speed_table":[[0,20],[5,30],[15,40],[25,10000],[35,10000]]}