Next we need to paste the below code to the Constant-position-mobility-model_eg.cc file and save the file in the ns3/scratch folder.

Code:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/mobility-module.h”

#include “ns3/internet-module.h”

#include “ns3/constant-position-mobility-model.h”

using namespace ns3;

int main(int argc, char *argv[])

{    LogComponentEnableAll(LOG_PREFIX_TIME);

    LogComponentEnableAll(LOG_PREFIX_FUNC);

    CommandLine cmd;

    cmd.Parse(argc, argv);

    // Create nodes

    NodeContainer nodes;

    nodes.Create(10);

    // Configure the constant position mobility model for the nodes

    MobilityHelper mobility;

    Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator> ();

    double L = 50.0; // Side length of the triangle

    double height = L * sqrt(3) / 2; // Height of the equilateral triangle

    // Add positions for a triangular layout

    positionAlloc->Add(Vector(0.0, 0.0, 0.0)); // Node 0 at (0,0)

    positionAlloc->Add(Vector(L, 0.0, 0.0)); // Node 1 at (L,0)

    positionAlloc->Add(Vector(L/2, height, 0.0)); // Node 2 at (L/2, height)

    // For remaining nodes, position them along the edges of the triangle

    positionAlloc->Add(Vector(L/4, height/2, 0.0)); // Node 3

    positionAlloc->Add(Vector(3*L/4, height/2, 0.0)); // Node 4

    positionAlloc->Add(Vector(L/2, height/4, 0.0)); // Node 5

    positionAlloc->Add(Vector(L/8, height/4, 0.0)); // Node 6

    positionAlloc->Add(Vector(7*L/8, height/4, 0.0)); // Node 7

    positionAlloc->Add(Vector(3*L/8, 3*height/4, 0.0)); // Node 8

    positionAlloc->Add(Vector(5*L/8, 3*height/4, 0.0)); // Node 9

    mobility.SetPositionAllocator(positionAlloc);

    mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

    mobility.Install(nodes);

    // Print the positions of the nodes

    for (NodeContainer::Iterator i = nodes.Begin (); i != nodes.End (); ++i)

    {

        Ptr<Node> node = *i;

        Ptr<MobilityModel> mob = node->GetObject<MobilityModel> ();

        NS_LOG_UNCOND (“Node ” << node->GetId () << ” Position: ” << mob->GetPosition ());

    }

    Simulator::Run();

    Simulator::Destroy();

    return 0;

}