重构发送初始数据 ，改在蓝牙连接状态之后发送初始数据和考试状态

endian11

2020-12-04 8ee5db35d4b70cd13ca31d3783f427208aa8c0a4

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{"cross_school_max_speed":30,"crossing_break_valid_distance":30,"crossing_stop_valid_distance":3.5}