to handle routing replies $($RREP$),$ errors $($RERR$),$ topology control $($TC$),$ MPT$,$ and neighbor discovery according to your hybrid routing protocol specifications. Writ eme code of it$.//...($Previous code$)$

$//$ Function to send a specified number of hybrid RREQ packets

void SendHybridRREQ$($Ptr source, Ipv$4$Address destAddress, uint$32\_$t numPackets$)\{$

for $($uint$32\_$t i $=0$; i $<$ numPackets; $++$i$)\{$

CustomAODVRouteRequest$($source$,$ destAddress$)$;

$\}$

$\}$

$//$ Function to measure PDR$,$ E$2$ED$,$ throughput, and routing overhead

void MeasurePerformance$($uint$32\_$t numNodes, uint$32\_$t numPackets$)\{$

$//...($Your measurement logic goes here$)$

$//$ Perform simulations with different numbers of nodes and packets

$\}$

int main$()\{$

$//...($Previous code$)$

$//$ Send $100,1000,5000$ hybrid RREQ packets for $20,30,50,100$ nodes

for $($uint$32\_$t numNodes : $\{20,30,50,100\})\{$

NodeContainer nodes;

nodes.Create$($numNodes$)$;

$//...($Rest of the setup logic$)$

$//$ Send hybrid RREQ packets

Ipv$4$Address destAddress$("192\mathrm{.}168\mathrm{.}1\mathrm{.}2")$;

SendHybridRREQ$($nodes$.$Get$(0),$ destAddress, $100)$;

SendHybridRREQ$($nodes$.$Get$(0),$ destAddress, $1000)$;

SendHybridRREQ$($nodes$.$Get$(0),$ destAddress, $5000)$;

$//...($Run simulation, measure performance, etc.$)$

$\}$

$//$ Perform additional simulations and measurements as requested

MeasurePerformance$(10,1000)$;

MeasurePerformance$(20,1000)$;

MeasurePerformance$(30,1000)$;

MeasurePerformance$(50,1000)$;

MeasurePerformance$(100,1000)$;

MeasurePerformance$(1000,1000)$;

$//...($Rest of the main function$)$

$\}$b#include

$"$

ns

$3$

$/$

core

$-$

module.h

$"$

#include

$"$

ns

$3$

$/$

network

$-$

module.h

$"$

#include

$"$

ns

$3$

$/$

mobility

$-$

module.h

$"$

#include

$"$

ns

$3$

$/$

internet

$-$

module.h

$"$

#include

$"$

ns

$3$

$/$

applications

$-$

module.h

$"$

#include

$"$

ns

$3$

$/$

aodv

$-$

module.h

$"$

#include

$"$

ns

$3$

$/$

olsr

$-$

module.h

$"$

using namespace ns

$3$

;

enum RoutingProtocol

$\{$

$$AODV$,$ OLSR, HYBRID

$\}$

;

struct RouteEntry

$\{$

$$ Ipv

$4$

Address dest;

$$ Ipv

$4$

Address nextHop;

$$ RoutingProtocol protocol;

$$ RouteEntry

$($

Ipv

$4$

Address dest, Ipv

$4$

Address nextHop, RoutingProtocol protocol

$)$

$$ : dest

$($

dest

$)$

$,$

$$nextHop

$($

nextHop

$)$

$,$

$$protocol

$($

protocol

$)$

$\{$

$\}$

$\}$

;

std::vector routingTable;

bool IsAODVZone

$($

Ptr node

$)$

$\{$

$$

$/$

$/$

$$Placeholder logic for AODV zone determination

$$ return false;

$\}$

void CustomAODVRouteRequest

$($

Ptr source, Ipv

$4$

Address destAddress

$)$

$\{$

$$ Ptr packet

$=$

$$Create

$($

$)$

;

$$ Ipv

$4$

Header ipvHeader;

$$ ipvHeader.SetSource

$($

source

$-$

$>$

GetObject

$($

$)$

$-$

$>$

GetAddress

$($

$1$

$,$

$0$

$)$

$.$

GetLocal

$($

$)$

$)$

;

$$ ipvHeader.SetDestination

$($

destAddress

$)$

;

$$ packet

$-$

$>$

AddHeader

$($

ipvHeader

$)$

;

$$ packet

$-$

$>$

AddHeader

$($

AodvHeader

$($

$)$

$)$

;

$$ source

$-$

$>$

Send

$($

packet

$)$

;

$\}$

void CustomAODVRouteReply

$($

Ptr node, RouteEntry route

$)$

$\{$

$$ Ptr reply

$=$

$$Create

$($

$)$

;

$$ reply

$-$

$>$

AddHeader

$($

route

$)$

;

$$ node

$-$

$>$

Send

$($

reply

$)$

;

$\}$

void HybridRoutingLogic

$($

Ptr node, Ipv

$4$

Address destAddress

$)$

$\{$

$$ if

$($

IsAODVZone

$($

node

$)$

$)$

$\{$

$$ CustomAODVRouteRequest

$($

node

$,$

$$destAddress

$)$

;

$$

$\}$

$$else

$\{$

$$

$/$

$/$

$$Placeholder for OLSR logic

$$

$/$

$/$

$$You can implement your OLSR routing logic here

$$

$/$

$/$

$$For simplicity, this example does not include detailed OLSR logic

$$

$/$

$/$

$$For now, let's assume OLSR does nothing

$$

$\}$

$\}$

class PacketMonitor

$\{$

public:

$$ PacketMonitor

$($

$)$

$$: lostPackets

$($

$0$

$)$

$\{$

$\}$

$$ void CheckForLostPackets

$($

Ptr packet

$)$

$\{$

$$ if

$($

$!$

packet

$-$

$>$

Received

$($

$)$

$)$

$\{$

$$ lostPackets

$+$

$+$

;

$$

$\}$

$$

$\}$

$$ int GetLostPackets

$($

$)$

$\{$

$$ return lostPackets;

$$

$\}$

private:

$$ int lostPackets;

$\}$

;

int main

$($

$)$

$\{$

$$ NodeContainer nodes;

$$ nodes.Create

$($

$10$

$)$

;

$$ MobilityHelper mobility;

$$ mobility.SetMobilityModel

$($

$"$

ns

$3$

::RandomWalk

$2$

dMobilityModel",

$$ "MinSpeed", StringValue

$($

$"$

$1\mathrm{.}0$

$"$

$)$

$,$

$$ "MaxSpeed", StringValue

$($

$"$

$10\mathrm{.}0$

$"$

$)$

$)$

;

$$ mobility.Install

$($

nodes

$)$

;

$$ InternetStackHelper internet;

$$ internet.Install

$($

nodes

$)$

;

$$ AodvHelper aodv;

$$ OlsrHelper olsr;

$$ Ipv

$4$

StaticRoutingHelper staticRouting;

$$ Ipv

$4$

AddressHelper address;

$$ RoutingProtocol currentProtocol

$=$

$$AODV;

$$ PacketMonitor monitor;

$$ Ipv

$4$

Address destAddress

$($

$"$

$192\mathrm{.}168$

$.$

$1\mathrm{.}2$

$"$

$)$

;

$$

$/$

$/$

$$Assign IP addresses

$$ address.SetBase

$($

$"$

$192\mathrm{.}168$

$.$

$1\mathrm{.}0$

$"$

$,$

$"$

$255\mathrm{.}255$

$.$

$255\mathrm{.}0$

$"$

$)$

;

$$ Ipv

$4$

InterfaceContainer interfaces