I am away from work PC but the commands are from Crestron's help pages if you search CEC commands.  When I press any of the navigation keys it wakes up the NVidia Shield.  Yes the menu works.  I use it to control the Channels DVR APP and menu is working fine.  Look at this public post that has them also: https://groups.io/g/crestron/topic/hdmi_cec_control_codes/35764759