After lot of testing i found out that we can use WDS and easymesh mesh togather.

Example.

Internet main router --> connected c6 via WDS for internet --> now add new satalite router under easymesh using c6 as main router --> add c80 and c6u or any easymesh compatible device in satalite mode under easymesh.

All done.

No wire use in whole issue.

Know problem.

In WDS your can't upgrade firmware.

In WDS it will show as no internet (their is internet)