Wow, this is getting very interesting. Unlike stars, I had no idea planets could excert any other measurable effect beside the gravitational pull, I'm one century late on this

So, it was actually true, at least to some extent. What I felt during the experience, and this one was not a voice while in trance, but a teacher in a dream school, is that the Earth itself speaks by lightnings, it's the actual communication, she said that the other planets 'read' the lightnings like letters, much like the example you gave of the morse code.
At that time that information seemed to me too allegorical to be taken seriously, like something you could tell 5-year-olds when they asked about storms.
It didn't cross my mind that this could be a technology used by beings for interchange of information, but yes, it seems possible as an alternative, or complement for satellite communications, imagine, instead of stream, they pack all the data in a single lightning and zap, it's all in front of you!