def send_timer_message(topic, tag, body, timer, key = '')
      @producer.send_timer_message(topic, tag, body, timer.to_i * 1000, key)
    end
def send_timer_message(topic, tag, body, timer, key = '')
      @producer.send_timer_message(topic, tag, body, timer.to_i * 1000, key)
    end
Send a timer message.

 @example send 'Hello, World!' message at 30 seconds later
   producer.send_timer_message('TopicTestMQ', 'tagA', 'Hello, World!', Time.now + 30)

 @see #send_message

 @param topic [String] the message topic
 @param tag [String] the message tag
 @param body [String] the message body
 @param timer [#to_i] when deliver the message
 @param key [String] the message key
 @return [String] the message id