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keyfob有限广播模式，例程上说是30.72s后停止广播，但实测发现广播时间为3分钟，后来又找到了
#define TGAP_LIM_ADV_TIMEOUT 1 //!< Maximum time to remain advertising, when in Limited Discoverable mode. In seconds (default 180 seconds)
说默认180s，那么问题：
如何修改广播时间为60s
1、首先保证你的广播模式是Limited Discoverable mode即：
#define DEFAULT_DISCOVERABLE_MODE GAP_ADTYPE_FLAGS_LIMITED
2、设置广播超时参数（TGAP_LIM_ADV_TIMEOUT），即：
//Maximum time to remain advertising, when in Limited Discoverable mode. unit is seconds#define USER_DEF_ADV_TIMEOUT 30
GAP_SetParamValue( TGAP_LIM_ADV_TIMEOUT, USER_DEF_ADV_TIMEOUT );
3、祝你好运！
