Changing veins message

Question

Why this program doesn't work? I just changed the message content.

Instead of sending road block id, I want to send a generic message with "MyMessage" string.

void TraCIDemoRSU11p::sendMessage(std::string blockedRoadId) 
{
    sentMessage = true;
    t_channel channel = dataOnSch ? type_SCH : type_CCH;
    WaveShortMessage* wsm = prepareWSM("data", dataLengthBits, channel, dataPriority, -1,2);
    //wsm->setWsmData(blockedRoadId.c_str());
    wsm->setWsmData("MyMessage");
    sendWSM(wsm);
}

The simulation starts but when the first message will be sent an error appears:

TraCI Server reported error executing command 0xc4:"Referenced edge 'MyMessage' is not known".

What do you mean "doesn't work" - it does not compile, or it generates an exception or run-time error? — Jerzy D., Feb 20 '17 at 07:45

score 2 · Accepted Answer · answered Feb 20 '17 at 08:24

I am guessing you are modifying the tutorial simulation that comes with Veins 4.4.

This simulation works as follows: if a car is stopped for more than a few seconds, it sends its current road to all vehicles in range. If a car receives such a message it will forward it to other cars and it will try to find a route to its destination that avoids the road in this message.

I am guessing you only changed the contents of the message from a road name to some string. Thus, any car receiving the message will still try to avoid the road identified by this string. Because such a road does not exist you are getting an error.

Ok, thanks. So in fact the message ("MyMessage") is being sent, but because the cars don't know what to do with this message the error appears, got it. — pb772, Feb 20 '17 at 08:30

Changing veins message

1 Answers1