I'm developing a simple TinyOS program with multihop.
Using Intercept.forward I inject some data into each packet, so that at the
root I can see the path the packet has taken.
I would also like to make some statistics based on the packets a node
receives which it has to drop (because it is not root, and it is not on the
current selected path). For that I thought I could use Snoop.receive
I've installed the program onto 3 modes (a root and two producers). I then
plug into the root to my laptop, and the producers node are located right
next to the root. The root receives the packets correctly, and I can verify
that Intercept.forward is called (by toggling a led). However, Snoop.receive
is never called.
The hardware is TelosB
Below is the relevant code:
components CollectionC as Collector, // Collection layer
ActiveMessageC, // AM layer
new CollectionSenderC(AM_MVIZ_MSG), // Sends multihop RF
SerialActiveMessageC, // Serial messaging
new SerialAMSenderC(AM_MVIZ_MSG); // Sends to the serial port
components CtpP as Ctp;
components CC2420ActiveMessageC;
MVizC -> CC2420ActiveMessageC.CC2420Packet;
MVizC.RadioControl -> ActiveMessageC;
MVizC.SerialControl -> SerialActiveMessageC;
MVizC.RoutingControl -> Collector;
MVizC.Send -> CollectionSenderC;
MVizC.SerialSend -> SerialAMSenderC.AMSend;
MVizC.Snoop -> Collector.Snoop[AM_MVIZ_MSG];
MVizC.Receive -> Collector.Receive[AM_MVIZ_MSG];
MVizC.Intercept -> Collector.Intercept[AM_MVIZ_MSG];
MVizC.RootControl -> Collector;
MVizC.CtpInfo -> Ctp;
MVizC.LinkEstimator -> Ctp;
event message_t*
Snoop.receive(message_t* msg, void* payload, uint8_t len) {
snoop++;
total++;
call Leds.ledOn();
return msg;
}
event bool Intercept.forward(message_t* msg, void* payload, uint8_t
len){
int i;
mviz_msg_t* omsg = (mviz_msg_t*) payload;
for(i = 0; i < MOTES; i++){
if(omsg->path[i] == MOTES+1){
omsg->path[i] = (uint8_t)TOS_NODE_ID;
omsg->rssi[i] = call CC2420Packet.getRssi(msg);
break;
}
}
call Leds.led2On();
total++;
return TRUE;
}
The counters snoop and total are never incremented, and the Led0 is never
turned on.
Med Venlig Hilsen/Best Regards
Jan Christensen
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