Besides the WindowsCE handheld and the POS device, can a WinXP laptop
connect to the SSID and receive a DHCP assigned IP address ok (and show
up as Authenticated on Monitor/Currently Connected Clients)? If so, it would
point to the WinCE and POS device, else it could be an authentication issue.
If the problem is seen with just a couple devices connected, you can rule out
a Ruckus proprietary multicast-unicast conversion done on DHCP to increase
delivery. From an SSH session with your ZoneDirector, in Debug mode, you
can issue this command to all your currently connected APs, and see if this
helps your WinCE and POS devices?
remote_ap_cli -A "set qos directedDHCP disable"