right.. so your ME mgmt is on a different network and AP is in a different network. So the internal AP won't be able to join the ME WLC and eventually won't be able to broadcast any SSID. This is the thumb rule - All access points, including the prim...
I see where the problem is. Your AP is currently running on 17.15.3 image which is IOS - a completely different image type compared to 8.10.196, which is an AireOS image type and due to this you are not getting the 'ap-type mobility express' CLI opti...
some additional info on top of what @Scott Fella said -
From your initial config file, I can see that you have assigned an ip address 192.168.1.1 to the controller -
Management Interface IP Address Configuration [STATIC][dhcp]: staticManagement Int...
Simply you just need to do 'Clear'. Means -
If you just do clear, AP will reload and go back to Flex mode again (from monitor mode), provided you have correct AP Tag config.
as @marce1000 & @Leo Laohoo stated, you should consider upgrade the setup. First of all move to a 9800 deployment. If you can't at this point then upgrade the 2504 to the latest 8.5 version.
On an another note, since you have mentioned AP reset by c...