Hi Havan_IronOak
Most of the radio messages are just to add feeling to the game.
However, some had been added and are actual real time game events (the re-supply ship)
In general:-
gray background message = not game event (with OHII following historical dates - some will have meaning in your game)
red = actual and aimed at the player (OHII)
blue = requires you to respond
Also - wolfpack messages (after you have sent contact report) are real game events.
Hope this helps