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WL1837MOD: How can I confirm DTIM operation?

Part Number: WL1837MOD

Following up on 

I discovered that the wpa_supplicant supports configuring the DTIM period an Beacon Interval:

# Default value for DTIM period (if not overridden in network block)

# Default value for Beacon interval (if not overridden in network block)

If I inspect a nearby network and look at the Traffic Indication Map, I can see the DTIM period is set to 2 (and the Beacon Interval in the network list shows 102.4ms:

I have had success changing the beacon interval using the parameter in the supplicant configuration file, but I can't seem to inspect the Traffic Indication Map to determine whether my attempt to set the DTIM period to 1 was successful:

I assume this is supported, but how can I confirm the setting is having an impact?

I tried using "iw wlan0 link" and "iw p2p-wlan0-0 link" but the response is "Not connected"