Is the TEW-210APB WiFi certified ???
TRENDNet does not appear on WECA's list so it does not appear to be, however there can be some delay in their website being updated after a product is certified so you will need to check with the vendor. Please note that 802.11b compliant does not mean it is WiFi certified
http://www.weca.net/OpenSection/certified_products.asp?TID=2
If it is not certified then interoperation can not be gaurenteed.
By Client mode do you mean it acts as a repeater ?