在omnet中将功能作为消息发送

Question

I am using Veins 4a2 in omnet++4.6. I would like to send the information contained in a function as a message to the neighbor nodes. How can achieve this? the function in .cc looks like this:

void TraCITestApp::append2List(short carId, short firstEmptyArrayIndex,     simtime_t messageTime, double theta, std::string vType) {
listedVehicles[firstEmptyArrayIndex].id = carId; // ~~here the Id is changed name to car ID.
listedVehicles[firstEmptyArrayIndex].lastSeenAt = messageTime;
listedVehicles[firstEmptyArrayIndex].vType = vType;
listedVehicles[firstEmptyArrayIndex].theta = theta;
EV << "Appending car with id " << carId <<" type "<< vType << " to the list of known vehicle." << endl;



/* @brief Increase related counting variable
* The total number always increased for each vehicle
*/
currentNumberofTotalDetectedVehicles++;
}

.

void TraCITestApp::showInfo_D(short counter){
EV << "Listed Table for Truthtelling:" << endl;
   for (int i = 0; i < counter; i++)
 { EV << "Serial [" << i << "] " <<"ID="<< listedVehicles[i].id <<  "\tTruthtelling prob.\t" << listedVehicles[i].theta <<endl;

std::ofstream tracefile;
   tracefile.open("traceFiledata.txt", std::ios_base::app);
   tracefile << "============================================";
   tracefile << "MyID=" << getMyID() << ";" <<"Serial [" << i << "] " <<"ID="<< listedVehicles[i].id <<  ";" << "Time=" << simTime() << ";" << "TTP=" << listedVehicles[i].theta << getMetaData() << std::endl;
   tracefile.close();

}

EV << "Total number of detected vehicle\t: " << currentNumberofTotalDetectedVehicles << endl;

}

I can call the method in void TraCITestApp::onData(WaveShortMessage* wsm) as showInfo_D(currentNumberofVehicles);

But how can i send this information to other neighbor vehicles. I want to send and accumulate the information in each vehicles but only the initial information ie i dont send all the accumulated information.

Answer 1

You can extend the WSM to contain the information that you want to exchange. Here is an example of extending WSM and creating a message for your own purpose.

Simply declare variables inside the message definition that will hold your data

cplusplus {{
#include "veins/modules/messages/WaveShortMessage_m.h"
}}

class WaveShortMessage;

message MyAppsPacket extends WaveShortMessage {
    string sourceAddress;           
    string destinationAddress;      
    simtime_t sendingTime;
    string vehicleID;
    whateverType theta;
}

Then when generating MyAppsPacket you can do:

MyAppsPacket->setTheta(theta);
MyAppsPacket->setSendingTime(simeTime());
MyAppsPacket->setVehicleID(listedVehicles[i].id;

Unfortunately I can not give you a read-to-use solution since I don't know the very details of your code, but this should give you a rough idea of what you should do.