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8. End-to-end acknowledgements For non-broadcast messages, there are basically 2 types of message retry: end-to-end acknowledgement (APS ACK) and single-hop acknowledgement (MAC ACK). MAC ACKs are always on by default and are usually sufficient to guarantee a high degree of reliability in the network. To provide additional reliability, as well as to enable the sending device get confirmation that a packet has been delivered to its destination, APS acknowledgements may be used. APS acknowledgement is done at the APS layer and is an acknowledgement system from the destination device to the source device. The sending device will hold the message until the destination device sends an APS ACK message indicating that it received the message. This feature can be enabled/disabled for each message sent with the options field of the call to AF_DataRequest(). The options field is a bit map of options, so OR in AF_ACK_REQUEST to enable APS ACK for the message that you are sending. The number of times that the message is retried (if APS ACK message isn’t received) and the timeout between retries are configuration items in f8wConfig.cfg. APSC_MAX_FRAME_RETRIES is the number of retries the APS layer will send the message if it doesn’t receive an APS ACK before giving up. APSC_ACK_WAIT_DURATION_POLLED is the time between retries.
