OMNeT New projects for learning

Preface

I learned that before OMNeT Install and run the official example code , This article records ,OMNeT How to create a new project .
I am a beginner , If there are mistakes, please criticize and correct them ！

This article is original. , It's not easy to create , Reprint please indicate ！

New project

open OMNeT Installation root path of , open mingwenv.cmd, Input omnetpp, open omnet ide.

top left corner File – New – OMNeT++ Project..., Then enter a project name , then Next, And then choose – Empty project with 'src' and 'simulations' folder – Finish.

The file directory is as follows ,

newly build cc file

Let's start by creating a new cc file ,src – New – Source File

Then input... In the pop-up interface test.cc Create a new one cc File to realize the functions of simple modules

Then we enter the following code ：

/*
 * test.cc
 *
 *  Created on: 2022 year 4 month 21 Japan 
 *      Author: Ronglin
 */

#include <string.h>		// String function 
// These two lines of code are fixed 
#include <omnetpp.h>	// Import necessary header files 
using namespace omnetpp;	// Use command space omnetpp

/**
 * Create a test class , Such inheritance cSimpleModule
 * In the network , Our new building tic and toc Modules are all Test1 object   from omnet++ Created at the beginning of the simulation 
 * And we're going to rewrite the virtual function initialize() and handleMessage(cMessage *msg) Method 
 * To implement our custom functions 
 */
class Test1 : public cSimpleModule
{
    protected:
        virtual void initialize() override;
        virtual void handleMessage(cMessage *msg) override;
};

// To put Test1 Class is registered in the project 
Define_Module(Test1);

/**
 * Rewrite the initialization function 
 * The initialization function is mainly to realize the logical functions to be completed when a module is just created 
 * In this function , The logical functions realized are 
 * If the name of this module is "tic" Then create a Message And pass out Send by mouth 
 */
void Test1::initialize()
{
    if (strcmp("tic", getName()) == 0) {
        cMessage *msg = new cMessage("tictocMsg");
        send(msg, "out");
    }
}
/**
 * This method is mainly used when receiving a message 
 * The logical functions that this module should perform 
 * In this function , The logical functions realized are 
 * After receiving the message , Pass the message through out Send it out through the mouth 
 */
void Test1::handleMessage(cMessage *msg)
{
	send(msg, "out"); 
}

Give a brief explanation , You can also check against the notes by , First define a class , Then this class should inherit from cSimpleModule Class and then override the function initialize() and handleMessage(cMessage *msg), At the same time, pay attention to register the class to omnet in .
After you've written build Again , menu bar – Projec – Build Project You can complete without reporting an error .

There is no note here for the convenience of copying

#include <omnetpp.h>
using namespace omnetpp;

class Test1 : public cSimpleModule
{
    protected:
        virtual void initialize() override;
        virtual void handleMessage(cMessage *msg) override;
};

Define_Module(Test1);

void Test1::initialize()
{

}

void Test1::handleMessage(cMessage *msg)
{

}

The configuration file

Then there is the modification of the configuration file , It's mainly two files , One is omnetpp.ini, The other one is ned file , All in simulations Under the folder .

omnetpp.ini

There are few changes in this file , Just enter the network (Network) Name is enough , My name is test_network

package.ned

It opens at simulations Under folder package.ned file , Next , Let's create a network .

GUI

First of all, provide GUI Create network in mode
It opens at package.ned, On the right side Type Choose the third Network, Click on it. , Then move the mouse to the left , Click again , You can create a network .

Right click the newly created network , first Properties..., Here you can set the name of this network , Icon , Location, etc , We just need to change the name , The effect is as shown in the picture , This name should correspond to omnetpp.ini Network name in .

Then you have to create a model , Click on the following Source, Then enter the code , The door structure used to define the model

simple Test1
{
    gates:
        input in;
        output out;
}

Then click back Design , Mouse click Test1 , Drag to the gray box in the network , Because you need two , We drag twice .

then , Check the inside of the gray box Test1, Right click , first Properties..., Just change Name, I have one here called tic, One is called toc.
Then establish a connection , On the right side palette – Connection, And then click tic Click again toc, And then choose tic.out-->toc.in, Established a path from tic To toc The connection route , After the connection is established , Because you also need to set the delay , Select line , Right click ,Properties...– Type choice DelayChannel – OK Pictured .

Then set the delay time , Select line , Right click – Parameters... , And then click Value, Input 100ms then ok.

the reason being that tic and toc Two way communication , We need to connect twice , Empathy , from toc Click again tic Establish a two-way connection , Then set the delay , Complete the following figure ：

thus , A simple project is created .

Then click... On the toolbar Run Then a new interface pops up , Click again Run You can see the delivery of the message

Source

sometimes GUI Although intuitive, modifying properties is cumbersome , Using code directly is simple , Attached directly here is tictoc1 Of ned Code

//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public License
// along with this program.  If not, see http://www.gnu.org/licenses/.
//
simple Txc1
{
    gates:
        input in;
        output out;
}

//
// Two instances (tic and toc) of Txc1 connected both ways.
// Tic and toc will pass messages to one another.
//
network Tictoc1
{
    @display("bgb=641,262");
    submodules:
        tic: Txc1 {
            @display("p=98,146");
        }
        toc: Txc1 {
            @display("p=381,61");
        }
    connections:
        tic.out --> {  delay = 100ms; } --> toc.in;
        tic.in <-- {  delay = 100ms; } <-- toc.out;
}

simple Test1
{
   parameters:		// Define the parameters of the module 
   gates:			//  Define the input and output ports of the module 
}

summary

OMNeT Very powerful , But the disadvantage is that there is too little information available on the Internet , I can only grope for myself step by step .