Libelium Waspmote, Техническое руководство

Страница: 75 / 171

-75- v6.3
802.15.4/ZigBee
The classic topology for this type of network is a star topology, as the nodes can establish point to point connections with
brother nodes through the use of parameters such as the MAC address or that of the network.
Figure: Star topology
API libraries:
WaspXBeeCore.h, WaspXBeeCore.cpp, WaspXBee900.h, WaspXBee900.cpp
All information about their programming and operation can be found in the document:
900MHz Networking Guide.
All the documentation is located in the Development section in the Libelium website.
8.5. XBee-DigiMesh
The XBee-802.15.4 and XBee-900 modules can use an optional firmware ( DigiMesh ) so that they can create mesh networks
instead of the usual point to point topology. This firmware has been developed by Digi aimed for allowing modules to sleep,
synchronize themselves and work on equal terms, avoiding the use of node routers or coordinators that have to be permanently
powered on. Characteristics of the implemented protocol:
• Self Healing: any node can join or leave the network at any moment.
•
All nodes are equal:
there are no father-son relationships.
• Silent protocol: reduced routing heading due to using a reactive protocol similar to AODV (Ad hoc On-Demand Vector
Routing).
• Route discovery: instead of keeping a route map, routes are discovered when they are needed.
•
Selective ACKs:
only the recipient responds to route messages.
• Reliability: the use of ACKs ensures data transmission reliability.
•
Sleep Modes:
low energy consumption modes with synchronization to wake at the same time.