关键词：OSDK，指南针状态，CompassStatus
订阅方式仅可以通过：TOPIC_COMPASS 拿到Mag struct，只有广播方式可以获取CompassStatus
/*!
* @brief struct for data broadcast, return magnetometer reading
*
* @note returned value is calibrated mag data,
* 1000 < |mag| < 2000 for normal operation
*/
typedef struct Mag
{
int16_t x;
int16_t y;
int16_t z;
} Mag; // pack(1)
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