Hub v1 or v2 as zigbee repeater / range extender

thank you for quick reply. Iris 3210 is still not the most cost effective solution.
I do read that xbee can be used as zigbee repeater here. However the post is not clear and I am not sure how to use xbee as zigbee repeater. Is there a concise post about how to use xbee as zigbee repeater?

Thanks