I'm not sure if this is a issue on mekanism's side or AE2's side.

Mekanism is registering the itemstack with AE2 via IMC for P2P attunement.
But apparently when I rclick with the transmitter items, it places it down instead.. or adds its multipart part to the block.

I have no clue- I've never even messed with attunement before. Your implementation looked correct, though.

Yeah, I opened a similar issue on the AE2 github to see if they might have any ideas. Either I'm not registering it correctly, or its a multipart thing.

EDIT: I guess I'll take another stab at this.

Well damn, FMLInterModComms.sendMessage is returning false, and AE2 doesn't even appear to be receiving the IMC messages. @.@

Figures, the MekanismHooks.hook() method is called from postInit. And by then its too late and AE2 doesn't even receive. So I had to make it register from init instead of from the hooks() method. - then it works like a charm.

Also is

public void addPulverizerRecipe(ItemStack input, ItemStack output, int energy)

even doing anything? IntelliJ is saying its never used.

It was a joke. Sorry.

Huh. I don't get the joke though.. Mind explaining? XD

It had to do with your implementation pr. It didn't work thus my joke came into existence. Typically for me, if you see a ":P" at the end, I'm joking.

Have to make things fun every once in a while... gets too serious otherwise.

Rui, y u breaking stuff? :P

I'm breaking stuff? Uh what?

For the record, I didn't modify where the MekanismHook.hook() method is called from.
I just modified where the IMC messages are sent to AE2 from, If you were misunderstanding what I wrote lol.