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协调器和终端设备单点通信,在终端设备每隔20ms发送一次数据的情况下,协调器向终端发数据没反应?

刚刚接触ZigBee,在学习单点通信时候,遇到几个问题。终端和协调器互发数据,定时器是500ms为间隔发送,终端发,协调器收到返回给终端。这时候双方是能收到数据的,但是定时器调成20ms时候,我发现协调器收到数据,无法返回给终端,大神们有没有遇到这种状况。