When Was The First Time Vader Spoke to Kylo? (Show me again the power…) – Star Wars Theory

In Star Wars The Force Awakens we saw Kylo Ren speaking to Darth Vader’s mask, asking to show him AGAIN the power of the darkness… When was the first time? How did they connect/speak? Did Anakin Skywalker speak to his grandson? Did Vader? He didn’t in the last jedi… Will he in episode 9?