1. Observed that robot.cfg is modifying with normal robot name and showing the normal robot as hub in IM.
2. Stopped the nimsoft watcher service.
3. Modified hub.cfg with correct hub name (as it is pointed to different robot name).
4. Modified robotname parameter in robot.cfg to correct robot name
5. Moved hub.sds and robot.sds files from hub folder to backup folder
6. Started the nimsoft watcher service on both hub and other robot server.
Now you can see that the hub is reporting properly in IM.