def send(message = nil)
      @alert = message if message.is_a?(String)
      @data = message if message.is_a?(Hash)
      client.push( payload.as_json )
    end
def send(message = nil)
      @alert = message if message.is_a?(String)
      @data = message if message.is_a?(Hash)
      client.push( payload.as_json )
    end
helper method to send a message
 @param message [String] the message to send