You're reading the documentation for an older, but still supported version (GL013300).
For information on the latest version, please have a look at GL013301.

5.2 Robot Initialization

As the robot controller receives and processes various information needed for robot operation through the initialization of the T/P application, the user application composed by using this API must start robot control after checking whether initialization has been completed in the information on robot operation state.

The completion of initialization can be checked through TOnMonitoringStateCB, which is a callback function, or get_robot_state, which is a user call function, when connecting normally by using robot connection-related functions.