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zigbee协议栈发送成功有应答吗

zigbee协议栈,如果一个终端给路由器或者协调器发送数据,发送成功的话,协调器或者路由器会有一个应答机制回复终端发送成功吗?如果有,那么又是怎么发生这个过程,丢包又怎么会出现;如果没有,是否自己需要设置一个应答来返回给终端。