code: function PlainMessage(options) {
      var opts = options ? options : {};
      this.constructor.s_.call(this, options);
      if (opts.message) {
          this.body = opts.message;
          this.auth_key_id = 0;
          this.msg_id = utility.createMessageId();
          this.bytes = opts.message.length;
      }
  }
docs: To get an instance for `serialization`:  new PlainMessage({message: myMessageBuffer}); Provide the payload as `Buffer`:  To get an instance for `de-serialization`:  new PlainMessage({buffer: myBuffer}); Provide a `buffer` containing the plain message from which extract the payload