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Previously, only a single controlconf message would be processed from a single TCP read even if the TCP read buffer contained multiple messages. Refactor the isccc_ccmsg unit to store the extra buffer in the internal buffer and use the already read data first before reading from the network again. Co-authored-by: Ondřej Surý <ondrej@isc.org> Co-authored-by: Dominik Thalhammer <dominik@thalhammer.it>