gnutls-cli is an alternative to openssl s_client. For binkd I'm using this:

node 99:9/999 -pipe "gnutls-cli --logfile /dev/null --no-ca-verification --strict-tofu --disable-sni *H:24553"

The most important parameter is "--logfile /dev/null". It's the equivalent of openssl's -quiet parameter.

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* Origin: (21:3/102)