Retrieve messages before this timestamp. Use 0 to fetch messages from the current time.
Specifies the number of messages to retrieve, range: 1-100
For SDK versions < 5.7.4, the range is [1-20]; for SDK versions ≧ 5.7.4, the range is [1-100]. Default value is 20
.
Message sorting order 0: Ascending 1: Descending
Message types
Get historical message configuration by message type