@brief Returns the message timestamp for a consumed message.
The timestamp is the number of milliseconds since the epoch (UTC).
\p tstype (if not NULL) is updated to indicate the type of timestamp.
@returns message timestamp, or -1 if not available.
@remark Message timestamps require broker version 0.10.0 or later.
See Implementation
@brief Returns the message timestamp for a consumed message.
The timestamp is the number of milliseconds since the epoch (UTC).
\p tstype (if not NULL) is updated to indicate the type of timestamp.
@returns message timestamp, or -1 if not available.
@remark Message timestamps require broker version 0.10.0 or later.