For Christmas lights, the final frontier is two wires LEDs. We could reverse engineer the protocol to use them but not the protocol to program them.

https://www.youtube.com/watch?v=AeA2jnb4K3g

Because there is no data in - data out in the LED, it has just two wires; you need to assign it an address and that part is not explained by the Chinese producer. Could anybody crack that one?