APPLICATION SUBLAYER

The application support sublayer, which is at the lowest level of the application layer, handles binding and discovery. The former involves matching devices based on how they’re supposed to interact. For example, a light switch doesn’t need to control a TV, but an audio-visual system remote can talk to the TV, a light dimmer, or a smoke alarm. The APS also relays messages from devices that cannot talk directly to each other. This is part of the mechanism that enables mesh networking.