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Get the radius value(hops)

JVELL
Prodigy 135 points

Hi All 

I would like to know when i receive a packet in ZStack, where can I get  the radius value (how many hops the packet taked from the destination to source).

Regards 

JVELL

  • 0
    Prodigy 120 points

    hi jvell,

    afaik, a standard ZigBee packet does not carry a hop count as it traverses the network.  On the other hand it probably does not need to because ZigBee network topology is not expected to change and in such a network just find the path from a source to a destination once is enough.

    so an alternative is to actually trace the route a packet goes through by sending ZDO_MGMT_RTG_REQ to the source node, find out in the returned routing table which node is the next hop for the interested destination; then sending ZDO_MGMT_RTG_REQ to this next hop to find out yet the next hop, so on until reaching the interested destination.

    btw, because of how aodv works, a route for a source to a destination may not be the same as the route from the same destination to the same source...

    lj

  • 0 in reply to LJ
    Prodigy 100 points

    Hi,

    The zigbee package carries the radius of the message that is decremented at each hop, but I do not know where the z-stack stores the information of the received message.