I have a capability that I'm attaching to all items. There are a couple of values that I would like to sync to the client, however since I am attaching this capability to all items I can't override onUpdate or getNBTShareTag to do the syncing. How can I do this, or is it even possible?

Bump

I explained how to sync item capabilities here:

 

When using the nbt share tag, I am sometimes nervous about whether it is synced right away because I think the share nbt is mostly updated on an inventory change -- like if you pick something up, switch item in your hands and such. So for good measure, assuming the item in question is the one being held I usually have the server send the held item update packet:

 

Quote

       if (player instanceof EntityPlayerMP)
        {
            ((EntityPlayerMP) player).connection.sendPacket(new SPacketHeldItemChange(player.inventory.currentItem));
        }