This topic describes the parameters of topic messages. A message can be retained for a maximum of one day in a topic. After the specified period ends, the message is collected by garbage collector no matter whether the message is pushed to the endpoints.


  • The ID of the message.
  • The message ID is unique in the topic.
The body of the message.
The MD5 hash of the message body.
  • The tag of the message.
  • If you specify a tag when you publish the message, MNS pushes the message to the endpoints based on the tag.
The time when the message was published. The value is a timestamp that follows the UNIX time format. It is the number of milliseconds that have elapsed since 00:00:00 Thursday, January 1, 1970.