Module beacon 

IEEE 802.15.4 Beacon frame parsing and building.

A beacon frame payload follows the base 802.15.4 header and contains:

• Superframe Specification (2 bytes, LE)
• GTS Specification (1 byte)
• GTS Directions (0 or 1 byte, present if GTS descriptor count > 0)
• GTS Descriptor List (variable, 3 bytes per descriptor)
• Pending Address Specification (1 byte)
• Pending Address List (variable)

Structs

BeaconPayload

Parsed beacon frame payload.

GtsDescriptor

GTS descriptor: short address + starting slot/length.