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Any invocation of AF_DataRequest() that returns ZSuccess will result in a “callback” by way of the AF_DATA_CONFIRM_CMD system event message. The sent Transaction Id (sentTransID) is one way to identify the message. Although the sample application will only use a single Transaction Id counter, it might be useful to keep a separate Transaction Id counter for each different endpoint or even for each cluster ID within an endpoint for the sake of message confirmation, retry, disassembling and reassembling, etc. Note that any transaction ID state variable (counter) that is passed to AF_DataRequest()gets incremented by this function upon success (thus it is a parameter passed by reference, not by value.) The return value of AF_DataRequest() of ZSuccess signifies that the message has been accepted by the Network Layer which will attempt to send it to the MAC layer which will attempt to send it over-the-air. The sent Status (sentStatus) is the over-the-air result of the message. ZSuccess signifies that the message has been delivered to the next-hop ZigBee device in the network. If AF_DataRequest() was invoked with the AF_ACK_REQUEST flag, then ZSuccess signifies that the message was delivered to the destination address. Unless the addressing mode of the message was indirect (i.e. the message was sent to the network reflector to do a binding table lookup and resend the message to the matching device(s)), in which case ZSuccess signifies that the message was delivered to the network reflector. There are several possible sent status values to indicate failure.
