I see getDescriptionPacket no longer exists. How do we synchronize the client with the server now?

I think what that link says is inverted

 

about the pair

getUpdateTag()

and

handleUpdateTarget

it is written:

 

Caveat: whatever tag you return must have the position of the TE in the "x" "y" and "z" tags. Otherwise MC doesn't know which TE to apply the packet to since we don't have anything like entity ID's. Any packets whose tags are missing "x" "y" and "z" are silently discarded.

 

The super class methods (in TileEntity) already deal with reading and writing x, y, z, id, and serialize some stuff.

 

About the pair

getUpdatePacket()

and

onDataPacket()

it is said:

Noncaveat: The position of the TE is in the packet, so this compound need not have the TE position

 

It really is, but we have to construct the packet ourselves, because the super method returns null.

 

After reading that short article, what I'm doing is this:

        @Override
public NBTTagCompound getUpdateTag()
{
	NBTTagCompound tag = super.getUpdateTag();
	tag.setString("Target", target);
	return tag;
}

@Override
public void handleUpdateTag(NBTTagCompound tag)
{
	super.handleUpdateTag(tag);
	target = tag.getString("Target");
}

@Override
public SPacketUpdateTileEntity getUpdatePacket()
{
	return new SPacketUpdateTileEntity(pos, getBlockMetadata(), getUpdateTag());
}

@Override
public void onDataPacket(NetworkManager net, SPacketUpdateTileEntity pkt)
{
	if(net.getDirection() == EnumPacketDirection.CLIENTBOUND)
	{
		readFromNBT(pkt.getNbtCompound());
	}
}

 

Is it correct?