4.7. ZigBee Application Support Sublayer (APS)
Okay. Don't ask me why the Application Support Sublayer uses the three-letter acronym APS. It's obvious, but don't ask me.
The Application Support Sublayer, or APS, sits above the NWK layer, and is the layer in ZigBee which understands applications. The APS frame over-the-air includes endpoints, clusters, profile IDs, and even groups.
APS is responsible for the following activities:
• Filtering out packets for non-registered endpoints, or profiles that don't match
• Generating end-to-end acknowledgment with retries
• Maintaining the local binding table
• Maintaining the local groups table
• Maintaining the local address map
APS has the job of filtering out packets for endpoints that don't exist in the node. ...
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