Atmel AVR2070 Manuel D’Utilisation

 

8240B-AVR-06/09 

•  The destination node must be more than two hops away from the 

coordinator.  For one or two hops, there is no ambiguity in the route, so 
no routing packet is required. 

•  The last time a packet was sent through the top-most router in a sub-tree, 

the destination address was different from the address of the packet 
currently being sent. 

5.  To create a routing packet, the coordinator builds a list of short addresses for 

each node in the chain to get to the destination node.  The coordinator then 
sends the routing packet to the first router node in the chain.  This causes 
each router in the chain to remember the route for the following data 
packet(s). The list does not include the destination short address, since the 
last router in the chain will recognize the data packet's final destination 
address as the address of one of its own children, and will send the packet on 
without any explicit routing information. 

For the following examples, see Figure A-5-1. Note that IEEE 802.15.4 headers are 
variable-length, with some fields omitted depending on the value of the various fields 
within the FCF.