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So after lots of reading I found I can only connect 2 + 7210 via Bridge Ap and AP mode, NOT Bridge Ap and Bridge AP.
My fault, so I can now share my network between 2 SSIDs.
Now I can also add a 3rd 7210 by using a Bridge with AP to connect to AP1 and again the 2 SSIDs can see each others connected wireless clients, BUT if 2 bridges are conencted to the one AP, clients connected to the Bridge SSID can not see a client connected at the other Bridge SSID.
Does that make sense?
Is there a configuration where I can share the network among 3 7210, so that any client connected to either one of the 7210s can "see" any other?
THANKS!!