Unreliable multicast never gets called

Development Programming & Scripting Multiplayer & Networking
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1

I declared a function in C++ as

	UFUNCTION(BlueprintCallable, NetMulticast, Unreliable, Category = "Gameplay")
	void AttachMesh(UStaticMesh* mesh, FName socket);

When I call it on the server it never seems to get replicated down to the clients. It’s not essential, so occasionally failing is ok but I don’t expect it to fail 100% of the time, especially not when I’m just running 2 PIE instances. If I make the function Reliable instead it works as expected so I know my logic is right.

Is there something wrong with my declaration that I’m missing? Or doe unreliable multicasts break in PIE or something for some reason?

2

Turns out you need to call SetIsReplicated(true) on a UActorComponent for it to replicate unreliable events. I would expect reliable ones to fail as well but that’s apparently not the case.

3

I’m in the same situation, let me understand. I have a an Unreliable NetMulticast function like this

if (ExplosionTemplate)
	{
		FTransform const SpawnTransform(HitResult.ImpactNormal.Rotation(), Location);
		AExplosionEffect* const EffectActor = GetWorld()->SpawnActorDeferred<AExplosionEffect>(ExplosionTemplate, SpawnTransform);

		if (EffectActor)
		{
			EffectActor->SurfaceHit = HitResult;
			UGameplayStatics::FinishSpawningActor(EffectActor, SpawnTransform);
		}
	}

Why does it always fail?