Inet framework: Send message from one host to another

Question

I am new to Omnet++ and I am trying to simulate a Wifi network. I have successfully created a network consisting of an AP and some nodes and all the nodes are able to connect to the AP.

What I want to do is that once all the nodes are connected to the AP, a node (based on its IP address) should send a message to another node in the network. I have created the .msg file with all the required fields and it is successfully compiled by the message compiler to the corresponding _m.h and _m.cc files. I want this message to be sent to the other node. How to proceed with this? Iknow it has to do something with the handleMessage() function but I can't find the file containing that function.

Thanks in advance for any kind of help.

user4786271 user4786271 · Accepted Answer · 2015-08-23T13:45:21

To send the initial message you will have to use the send() when you initialize you node.

From the tictoc tutorial:

void Txc1::initialize()
{
    // Initialize is called at the beginning of the simulation.
    // To bootstrap the tic-toc-tic-toc process, one of the modules needs
    // to send the first message. Let this be `tic'.

    // Am I Tic or Toc?
    if (strcmp("tic", getName()) == 0)
    {
        // create and send first message on gate "out". "tictocMsg" is an
        // arbitrary string which will be the name of the message object.
        cMessage *msg = new cMessage("tictocMsg");
        send(msg, "out");
    }
}

Then you want the nodes to be able to react. Their reaction can be silent -- just accept the message and delete it, or send another message in return.

For that you will need to implement the handleMessage() function inside the nodes .cc file.

void Txc1::handleMessage(cMessage *msg)
{
    // The handleMessage() method is called whenever a message arrives
    // at the module. Here, we just send it to the other module, through
    // gate `out'. Because both `tic' and `toc' does the same, the message
    // will bounce between the two.
    send(msg, "out");
}

Inet framework: Send message from one host to another

2 Answers