dear sir
1. The AP type is 224, Campus AP
2. #show datapath session , The AP have packets to the controller, but controller no traffic reply AP.
3. show log all | include 94b4-0fc9-cc34 no log
4.#show license limits license ok
5.no duplicate IP
6.AP has power,the LED's of PWR, Eth0, Eth1 are light, but 5Ghz and 2.4Ghz are dark.
7.Between the AP and controller no firewall
I think the 224 AP had hardware Problems, how kind method can find it .