Implementation of PMAC program under Contiki (i.)

I use a very simple transceiver program, that is, node 2 to the node 1 Loop hair Packet

First, Cooja simulation, two nodes can not be normal interaction, input function can not be triggered, cc2420 is not triggered; Print node information, suddenly found that node 2 is not a beacon. Tried several times and found that there was a problem with the interval of node 2. Test the rand () function. It is found that the Contiki has a well-encapsulated random.c, which can be used directly.

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Second, Node 2 hair 100 Packet, Node 1 unexpectedly received 322. View print information, Node 2 is sent every time, node 1 receives 2-3 times.

650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M00/77/A6/wKiom1ZqiErBPjdQAAD151f3Nx0201.png "title=" 2.png " alt= "Wkiom1zqierbpjdqaad151f3nx0201.png"/> Printing information again, the upper packet to 48 unexpectedly stopped, the underlying repeated tune Send_data, suspect is the ACK detection problem, resulting in the avoidance of re-sending, Check the program, found that no ACK was detected and forgot to return ....

650) this.width=650; "src=" Http://s1.51cto.com/wyfs02/M01/77/A6/wKioL1ZqkAuD5WpBAAFv9m6K12Y543.png "title=" 3.png " alt= "Wkiol1zqkaud5wpbaafv9m6k12y543.png"/>

Node to receive the package or there is a problem, will each packet number, printing information found each packet received three or so, after the discovery is CSMA retransmission caused, check the program, found that the PMAC back to the upper layer of the state word when the logic error .... After modification, send and receive normal. 650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/77/CB/wKiom1ZudOaB8Mb-AABcW1zbKVU521.png "title=" 4.png " alt= "Wkiom1zudoab8mb-aabcw1zbkvu521.png"/>

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Implementation of PMAC program under Contiki (i.)