Javascript 让Hubot在HipChat中发送直接消息

如何告诉Hubot使用HipChat适配器发送直接消息？我尝试了许多不同的选择，但都没有成功

module.exports = function (robot) {
  robot.respond(/hi/i, function (msg) {
    msg.send(msg.message.user.room, 'hi'); // outputs to current room
    msg.send(msg.message.user.id, 'hi'); // outputs to current room
    msg.send(msg.message.user, 'hi'); // outputs to current room
    msg.reply('hi'); // @mentions the user in the current room
    msg.reply_to('hi') // no reply_to method though I thought I saw this somewhere
  });
};

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我花了一段时间才找到它，但结果证明它是有效的：

module.exports = function (robot) {
  robot.respond(/hi/i, function (msg) {
    robot.send({
      user: msg.message.user.jid
    }, 'hi');
  });
};