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From historical precedents these are figuratively called numbers stations. They are generally considered to be organized crime or three letter agency related and being used to facilitate one way communications. The messages being relatively minor and about what you would expect in that regard. They are not nuclear launch codes or things that will cause bicycle bombs to suddenly start blowing up. More like, "place police station A under observation for the next three hours and report unusual activity," or, "forward next package delivery to address B."
Anyway, for the rest of us, they're just garden variety spam.