Zigbee is a wireless protocol used in many devices, including light bulbs, motion sensors, and other home automation devices. It follows the IEEE 801.15.4-based specification and Maximum Transfer Unit (MTU) is 127 bytes only.
Figure 1: Zigbee protocol stack. The strip pattern indicates encrypted information. APS and ZCL belong to the Application layer. MAC and Network layers contain the cleartext information of MAC and network addresses, PAN ID, and EPID.
