If you run List Resources on your DAP-2310 device, does it give you the Wireless option? If it does, please tick it so that it will be added to the Wireless tab.
Thanks for the quick reply jenene16! Unfortunately, I did not see the wireless option, this is what the AP gives me:
Status & response time
topology: layer 3(selected)
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Oh okay... If that's the case, then most probably your device is not responding to the OIDs NPM is using to poll wireless info:
You may want to submit a Feature Request for this: