code: private void setHandshakeSuccess() {
          handshakePromise.trySuccess(ctx.channel());
  
          if (logger.isDebugEnabled()) {
              logger.debug("{} HANDSHAKEN: {}", ctx.channel(), engine.getSession().getCipherSuite());
          }
          ctx.fireUserEventTriggered(SslHandshakeCompletionEvent.SUCCESS);
  
          if (readDuringHandshake && !ctx.channel().config().isAutoRead()) {
              readDuringHandshake = false;
              ctx.read();
          }
      }
docs: Notify all the handshake futures about the successfully handshake