I've been trying to build a better setup for our QLn220 printers and have looked through the CPCL guide and found some of the settings on the printer don't exist in the guide or have no description behind the parameters that are set on the printer, e.g.
! U1 setvar ""wlan.roam.interval"" ""20"" what is 20? Seconds, minutes, milliseconds?

Does anyone have some more detail behind the following commands that are on our printers so I can determine if they are needed or the value can be changed.  I'm interested in the CCX commands as our Cisco guys tell me that having this enabled may assist in the device roaming.

! U1 setvar ""wlan.preamble"" ""short""
! U1 setvar ""wlan.roam.rssi"" ""72""
! U1 setvar ""wlan.roam.signal"" ""50""
! U1 setvar ""wlan.roam.interval"" ""20""
! U1 setvar ""wlan.keep_alive.enable"" ""on""
! U1 setvar ""wlan.power_save"" ""off""
! U1 setvar ""ip.roam_packet"" ""on""
! U1 setvar ""wlan.power_save"" ""off""
! U1 setvar ""wlan.ccx.neighbor_support"" ""off""
! U1 setvar ""wlan.ccx.assisted_roam"" ""off""
! U1 setvar ""wlan.ccx.directed_roam"" ""off""
! U1 setvar ""wlan.ccx.l2_roaming_enhancements"" ""off""
! U1 setvar ""wlan.ccx.management_frame_protection"" ""off""
! U1 setvar ""wlan.ccx.link_test"" ""off""
! U1 setvar ""wlan.ccx.traffic_stream_metrics"" ""off""
! U1 setvar ""wlan.ccx.radio_management"" ""off""
! U1 setvar ""wlan.ccx.path_loss_measurement"" ""off""