有许多可以为其注册回调例程的操作，这个参数值指出了每个以EM _开头的操作(完整列表可以从api参考指导中获得)。
There are a number of operations that you can register callback routines for and the value to indicate each operation begins with EM_ (the complete list is available in the API reference guide).
从列表中删除所有元素(可选操作)。
Removes all of the elements from this list (optional operation).
当与超过8台设备进行配对操作时，最早的配对设备将被从配对设备列表中清除。
When an attempt to pair to more than eight devices is made, the oldest paired device is removed from the list.
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