In the Star Wars movie Rogue One, we see the Rebels communicating over the radio whilst at Light-speed. I don't recall seeing this in other Star Wars movies. (They pop out of Hyperdrive - and the situation is a big surprise).
Generally the idea of Hyperspace (note that we're making a distinction between Hyperdrive in Star Wars, and Warp Drive in Star Trek) is that you're in other dimension and can't communicate. Speaking generally - we do see a Star Trek movie make a big deal of being able to beam someone onto a ship travelling at Warp.
To me it seems that communicating over the radio at Hyperspace affects the plot (ie a Plot Hole) of some of the other Star Wars movies.
My question is: Are there any Star Wars Canon usage of 'Hyperdrive Radio' prior to Rogue One?