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We will start over with our code, for simplicity. We will write a simulation with two blue nodes. Both nodes will change to RED at time 10 and then change the color every now and then randomly. We already know how to do this. Additionally, each node will send...

OMNeT++ allows you to easily setup a delay for any connection in Network.NED like this : node1.my_gate <--> {delay=2s;} <--> node2.my_gate; If you re-run your code now, you will observe a different between when the node has sent out a message and when it was...

Setting up parameters for a module in OMNeT++ always consists of three steps: Define the parameter in the module NED file. For example, in Node.ned: simple Node { parameters: int triggerYellow; @display("b=60,10,rect,blue,black,2...

Parameters and the way you set them up and use them is one of the most useful features in OMNeT++. You can setup full simulation campaigns with parameter exploration studies that run fully automatically. Here are some further tips and tricks how to use them. ...

Sending messages from one node to another is simple. You need to define gates in the nodes, connect them and then use send() to send messages around. In our last example, we had quite a lot of messages, bouncing here and there. The biggest difficulty in maste...

The event queue is very important in discrete event simulations, as we already discussed shortly in Discrete Event Simulation. Now we are ready to look into it more closely. When you start a simulation, the event queue is showing you the currently scheduled e...

The simulation kernel is the heart of OMNeT++ and any other discrete event simulator. It is the one that takes all of your messages, organizes them into the event queue (see last page) and calls them one by one when their time has come. It is very important t...

Usually, the simulation will end automatically once there are no more events in the queue. Remember, this is also the reason why we always need at least one message to be scheduled during initialize for at least one node, otherwise the simulator will not start...

This is the end of our tutorial. We hope you understood the basics of discrete event simulations and are able now to create your own nodes and to send messages around. We only scratched on the surface of what OMNeT++ can offer you. We highly recommend to turn...

Let us discuss one pressing problem: how to organise greener conferences. The main points we will discuss are the catering and the travel / hotel stays of the participants. Green catering for scientific events This is not an easy task. You need to cover all ...

Let's talk about something that’s been on my mind for a long time now: the sustainability of our academic travels. It’s a tricky topic because it mixes economic, social, and environmental factors. I will try to break down these elements and suggest ways we can...

For presentations with the ComNets department, you are required to follow some formal steps that include the use of the right template, preserving a proper form, and adhering to slide and time limits. In the following, you will find the requirements for your t...

1. First round of presentation: First slide with your name and matriculation number, title, and authors of the research paper. The template does not matter. Use whatever you prefer. At most 4 slides, including the first one. One presentation is allocated 5 m...

For your presentations we provide you with a template that you are supposed to use. You can open it in PowerPoint, Google Slides, Open Office or the like. Find the template here How to use it You need to edit the master slides and include your name, the date,...