Zigbee | 四种基本的frame类型

The four basic frame types defined in 802.15.4: Data, ACK, MAC command, and beacon

The data frame provides a payload of up to 104 bytes. The frame is numbered to ensure that all packets are tracked. A frame-check sequence ensures that packets are received without error. This frame structure improves reliability in difficult conditions.

Another important structure for 802.15.4 is the acknowledgment (ACK) frame. It provides feedback from the receiver to the sender confirming that the packet was received without error. The device takes advantage of specified "quiet time" between frames to send a short packet immediately after the data-packet transmission.

A MAC command frameprovides the mechanism for remote control and configuration of client nodes. A centralized network manager uses MAC to configure individual clients' command frames no matter how large the network.

Finally, thebeacon frame wakes up client devices, which listen for their address and go back to sleep if they don't receive it. Beacons are important for mesh and cluster-tree networks to keep all the nodes synchronized without requiring those nodes to consume precious battery energy by listening for long periods of time.

参考链接：http://www.embedded.com/design/connectivity/4006430/Home-networking-with-Zigbee

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