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LP-CC1352P7: Wi-SUN Router node point to point communication

kathy huang
Prodigy 105 points
Part Number: LP-CC1352P7
Other Parts Discussed in Thread: WI-SUN

Hi Ti,

May I know is one Router Node can communication with another Router Node directly or not? If can, is the communication still need to go through Border Router? and how to implement it? Thank you very much.

  • 0
    TI__Guru* 83191 points

    Someone have been assigned to this post and will come back to you with an answer shortly

  • 0
    TI__Guru* 78071 points

    Hi Kathy,

    For devices that have a direct connection (1-hop connection), packets can be sent directly to the neighbor. For devices with more than one hop between them, the communication needs to go through the BR.

    Did you look into the multi cast feature? Here, you can make a group of several devices and send a broadcast packet to all of them.

    Cheers,

    Marie H

  • 0 in reply to Marie H
    Prodigy 105 points

    Hi Marie,

    Thanks for your reply, Can I make it more clear. If I am not wrong Wi-SUN mesh network actually is a tree topology as below, am I right? 

    Border Router(BR)                     BR

    Router Node(RN)                     /       \

                                            RN1             \

                                             /                   RN4

                                      RN2                  /    |    \

                                      /                    RN5  |       \ 

                                    /                               |       RN6 

                               RN3                           RN7          \

                                                                                     \

                                                                                    RN8

    "For devices that have a direct connection (1-hop connection),packets can be sent directly to the neighbor."  

    Is this meaning RN8 only can direct send packets to RN6, and RN8 can not directly send packets to RN7 or other RNs? If RN8 want to send packets to RN7 it must go through BR, am I right?

    "Did you look into the multi cast feature? Here, you can make a group of several devices and send a broadcast packet to all of them."

    yes,  I tried to use command ping ff05::2 to ping all the nodes through pySpinel cli from Border Router, but I haven't tried send packets from Router Node to Border Router or other Nodes. The example projects of Wi-SUN provided by TI are all base on coap communication between Border Router and Router Node. As I know every communication must active by Border Router(coap client) when using coap, so I don't know whether Router Node can actively send packets to Border Router or not. Is there any other example project implemented the communication between Border Router and Router Node do not use coap? Actually I want to know how to implement send packets from RN8  to RN7. Is there any reference application can use? Thank you very much. 

  • +1 in reply to kathy huang
    TI__Guru* 78071 points

    Hi Kathy,

    Yes you are correct. This mesh network is formed as a tree with the border router as the root.

    The border router is the only device that knows the location and address of all devices in the network, aka the routing table.

    Other devices in the network keep a neighbor table, and they know which device(s) are closer to the root (i.e. parent device) and which are further from the root (child device). However they do not store the path to evey other device in the network. Thus, they will need to send their message to the root which in turn will send it to the root.

    Cheers,

    Marie H

  • 0 in reply to Marie H
    Prodigy 105 points

    Hi Marie,

    I see, Thanks for your reply.

    BR

    kathy