6.4.4 Service Discovery

The router/end device requests Node Descriptor during the initialization procedure before finding and binding to discover the Capability Information and other details of the Coordinator device in the network. For more details, refer to 6.1.3 Zigbee Device Profile (ZDP).

Packet #28 and #36 show the Node Descriptor Request and Node Descriptor Response from the router and coordinator devices, respectively. Packet #40 shows the APS: ACK by end device for Node Descriptor Response from Coordinator.

Figure 6-34. Node Descriptor – End Device
The following figure illustrates the Node Descriptor Response from a Coordinator device. Under ZigBee Device Profile field, the user can see the following:
  • Capability Information of the coordinator node
  • Max Buffer Size
  • Server Flags
  • Descriptor Capability Field
Figure 6-35. Node Descriptor Response – End Device