The queue set being queried. It is not possible to block on
a read as this function is designed to be used from an
xQueueSelectFromSetFromISR() will return the handle of a queue (cast to
a QueueSetMemberHandle_t type) contained in the queue set that contains data,
or the handle of a semaphore (cast to a QueueSetMemberHandle_t type) contained
in the queue set that is available, or NULL if no such queue or semaphore
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