Foe imperial problem child, what if someone found "Anakin skywalkers" comm from clone wars and accidentally play it in front of rebels and empire... Recordings to Anakin Skywalker when he was too busy. "Please never improvise again" from zillo beast along with other things like from padme, obi wan and the council... Silly and serious things. Ahsoka and 501st prank calling him but end up with voice mail. Or drunk calling him.
Well it does bring up the question of whether he would’ve kept the old comm line (my suspicion is that he’d probably have destroyed it in his “that man is deeeeaaaadd*” phase of Darth Vaderness)
(*Which is actually the title of a track from one of the Count of Monte Cristo musicals and I find that amusingly appropriate)
But if he were to dig out the old communicator frequencies (nobody’s monitored these things in twenty years, why should they bring up any suspicion now?), that’d be a pretty good way for him to stay in contact with Luke and the other members of the conspiracy without alerting either Rebel or Imperial forces to their alliance. Actually, I like that. I like the idea that the members of this rebellion-in-a-rebellion are using “outdated” Clone Wars era tech and communication lines to send secret messages. Like that scene in Independence Day when they’re all using Morse Code so the aliens won’t know what they’re up to.
Of course, Luke would have his personal frequency and only Luke. But Luke, sweet kid that he is, went to show Ahsoka so he could gush about how cool Clone Wars tech was and man you guys made do with some improvised tech out on the fields and not much has changed has it? And what are these things made of? They’re like indestructible?!
And Ahsoka is just enjoying this babbling spiel, letting Luke be Luke, when she suddenly notices the frequency he’s tuning to is a very familiar one.
Wait a minute.
Did he seriously-? Oh yes, yes he did.
And now that Ahsoka knows Vader has dusted off his old comm frequency, she’s going to use this to her advantage.
Hope you like random update calls in the middle of your flight, Vader. You’re just lucky the old comm frequencies don’t support holo files or you’d be getting selfies too.