Hello.
After long time trying to make UDP sockets working I made it just by luck today!
At first thing i want to say thanks to 1 guy who solved 1 thing with UDP
Well it’s not maybe something pretty advanced but it’s working.
So far i was testing it on 127.0.0.1 and 192.168.x.x but i think on public IP it should work too[Not sure about ports, just open 1 port UDP, in my is 5000 for example]
There is my CPP file
#include "PluginMaking.h"
#include "ServerListener.h"
#include <string>
#include "Runtime/Core/Public/Misc/Base64.h"
// Sets default values
AServerListener::AServerListener(const FObjectInitializer& ObjectInitializer)
: Super(ObjectInitializer)
{
// Set this actor to call Tick() every frame. You can turn this off to improve performance if you don't need it.
PrimaryActorTick.bCanEverTick = true;
}
void AServerListener::EndPlay(const EEndPlayReason::Type EndPlayReason)
{
Super::EndPlay(EndPlayReason);
//~~~~~~~~~~~~~~~~
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void AServerListener::BeginPlay()
{
Super::BeginPlay();
FIPv4Endpoint Endpoint(FIPv4Address::Any, 5000);
ListenSocket = FUdpSocketBuilder(TEXT("SomeDescription"))
.AsNonBlocking()
.AsReusable()
.BoundToEndpoint(Endpoint)
.WithReceiveBufferSize(2 * 1024 * 1024);
int32 SendSize = 2 * 1024 * 1024;
ListenSocket->SetSendBufferSize(SendSize, SendSize);
ListenSocket->SetReceiveBufferSize(SendSize, SendSize);
}
void AServerListener::Callback(const FArrayReaderPtr& data, const FIPv4Endpoint&) {
const auto encoded = FBase64::Encode(*data);
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, encoded);
UE_LOG(LogTemp, Verbose, TEXT("Received: %s"), *encoded);
}
void AServerListener::Tick(float DeltaTime)
{
Super::Tick(DeltaTime);
TSharedRef<FInternetAddr> targetAddr = ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)->CreateInternetAddr();
//GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, "Dostalem wiadomosc yaay ");
TArray<uint8> ReceivedData;
uint32 Size;
while (ListenSocket->HasPendingData(Size))
{
uint8 *Recv = new uint8[Size];
int32 BytesRead = 0;
ReceivedData.SetNumUninitialized(FMath::Min(Size, 65507u));
ListenSocket->RecvFrom(ReceivedData.GetData(), ReceivedData.Num(), BytesRead, *targetAddr);
//Do something with the received data
char ansiiData[1024]; //A temp buffer for the data
memcpy(ansiiData, ReceivedData.GetData(), BytesRead); //Assumes bytesRead is always smaller than 1024 bytes
ansiiData[BytesRead] = 0; //Add null terminator
FString debugData = ANSI_TO_TCHAR(ansiiData);
//ListenSocket->RecvFrom(Recv, Size, BytesRead, *targetAddr);
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, "Message by UDP: " + debugData);
}
}
Just change anything you need to your settings it’s free to use.
And there is .h file
#pragma once
#include "GameFramework/Actor.h"
#include "Networking.h"
#include "ServerListener.generated.h"
UCLASS()
class PLUGINMAKING_API AServerListener : public AActor
{
GENERATED_UCLASS_BODY()
public:
//====================================================
public:
FSocket* ListenSocket;
FUdpSocketReceiver* mySocketReceiver;
virtual void BeginPlay() override;
virtual void Tick(float DeltaSeconds) override;
//ScreenMsg
FORCEINLINE void ScreenMsg(const FString& Msg)
{
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, *Msg);
}
FORCEINLINE void ScreenMsg(const FString& Msg, const float Value)
{
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("%s %f"), *Msg, Value));
}
FORCEINLINE void ScreenMsg(const FString& Msg, const FString& Msg2)
{
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("%s %s"), *Msg, *Msg2));
}
public:
void Callback(const FArrayReaderPtr& data, const FIPv4Endpoint&);
/** Called whenever this actor is being removed from a level */
virtual void EndPlay(const EEndPlayReason::Type EndPlayReason) override;
};
There are some old codes from Rama Code just remove it if u want.
Thanks for any feedbacks and likes 
Will try to update this thread as much as i can!
#1 Updated message encoding.
#2 Tested at public IP and works.
