Why the getSenderSpeed() is returning zero (always) in onBSM from veins-SUMO-omnet++?

Question

I am using veins version 5.2, omnetpp5.7, Eclipse SUMO Version 1.4.0. I am trying to implement a simple platooning of 3 vehicles following this tutorial: http://cse.iitkgp.ac.in/~soumya/micro/t2-4.pdf I followed exactly the same steps and the communication between the vehicles are established, but in onBSM function, the getSenderSpeed always return (0,0,0) resulting in getSenderSpeed.Length() = 0. I tried to debug it and tried to check the data from the debug variables menu, when I open the object that is sent to onBSM, there are two values which are getSenderPos and getSenderSpeed, when I open getSenderSpeed its zero, when I open getSenderPos, the simulation gets terminated. Any solutions? my Initialization Function:

    void VehicleControlApp::initialize(int stage)
{
    DemoBaseApplLayer::initialize(stage);
    if (stage == 0) {
        // Initializing members and pointers of your application goes here
        EV << "Initializing " << par("appName").stringValue() << std::endl;
        //new
        currentOfferedServiceId = 7;
        //       currentSubscribedServiceId = -1;
        wsaInterval = 5; // Period Interval of the service message
        beaconInterval = 0.1;
    }
    else if (stage == 1) {
        // Initializing members that require initialized other modules goes here

        //Initializing members that require initialized other modules goes here
        int id_2=getId();
        int id=myId;
        if (getId() == 15){
            // this is the head vehicle%WSA
            startService(Channel::sch2, currentOfferedServiceId, "Platoon Lead Vehicle Service");
            scheduleAt(computeAsynchronousSendingTime(beaconInterval, ChannelType::control),sendBeaconEvt);
        }}}

My onBSM function code:

void VehicleControlApp::onBSM(DemoSafetyMessage* bsm)
{
        double leadVehicleSpeed = bsm->getSenderSpeed().length();
        traciVehicle->setSpeedMode(0x1f);
        traciVehicle->setSpeed(leadVehicleSpeed);
}

Answer 1

The solution to my problem was just to make setHostSpeed = true in the ini file.