val fromSink = from.sink().buffer()
        hello(fromSource, fromSink)
        acceptCommand(from.inetAddress, fromSource, fromSink)
        openSockets.add(from)
      } catch (e: IOException) {
        logger.log(Level.WARNING, "$name failed", e)
        from.closeQuietly()
      }
    }
  }

  private fun hello(
    fromSource: BufferedSource,
    fromSink: BufferedSink,
  ) {