I have buttons that when you press send packets to the server. Here is how i handle the packets

 if (packet.channel.equals("DrinksNetwork")) {
            	((EntityPlayer)player).inventory.setInventorySlotContents(1, new ItemStack(Minespresso.Cappuccino));
            }

But since i have multiple buttons, I need to give the guibutton id and I dont know if you can do that. Here is what i tried

 if (packet.channel.equals("DrinksNetwork" && CappuccinoGUI.guibutton == 1)) {
            	((EntityPlayer)player).inventory.setInventorySlotContents(1, new ItemStack(Minespresso.Cappuccino));
            }

But that code doesnt work

Yep, sending button ID as a byte is how I got it working.

Thanks you so much!