I was wondering if there is a way to find which frames use A-MPDU, and A-MSDU, from traffic sniffed over-the-air from a devices running in monitoring mode.

I can "guess" by looking at some data: in the following screenshot, Rssi is only given for the first frame, and then nothing for the following frames, so I guess this is A-MPDU happening, but this is only a guess.

Some sniffed frames

And what about A-MSDU? I tried looking at wlan.qos.amsdupresent but it's never set, and I'm pretty sure that in this traffic A-MSDU is used (according to the emitter driver information). Am I making a mistake?

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