I need to be able to handle mouse input from the player and was wondering what the best way for that is - using the MouseEvent works well, but I need for the code to run every tick so long as the left click / right click is down. I also tried using the ClientTickEvent to check Mouse.isButtonDown() and event.phase, but that seemed too buggy and didn't send my packet every time. I would appreciate any input on this.

I'm guessing this would be correct:

 

@SubscribeEvent
public void onEvent(ClientTickEvent event)
{
	if(event.phase.equals(Phase.START))	
	{
		if(Mouse.isButtonDown(0))
		{
			UtilityMessage.sendMessageToServer(new MessageFire());
		}
	}
}

Don't send packets per tick. Do it once on Press (true) and unpress (false). Store bool in IEEP.