static S sendToLocalBotOpt(S bot, S text, O... args) {
  if (bot == null) return null;
  text = format(text, args);
  temp DialogIO channel = findBot(bot);
  if (channel == null) {
    print(quote(bot) + " not found, skipping send: " + quote(text));
    null;
  }
  try {
    channel.readLine();
    print(shorten(bot + "> " + text, 200));
    channel.sendLine(text);
    S s = channel.readLine();
    print(shorten(bot + "< " + s, 200));
    return s;
  } catch (Throwable e) {
    e.printStackTrace();
    return null;
  }
}