After several days of research, my best conclusion is that I should use log4j 2 instead.
Indeed, for the two functions I was looking for (TCP and RFC 5424), the patch was already ... ago! But he was never integrated into the master. (Also, I tried to collect more information about the developers mailing list , but never received a response.)
On the other hand, log4j 2 already has those functions ; and, as far as I can see, their community seems very reactive.
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