Is there a way to detect 802.11 devices "pass by" an wifi hotspot.
Like if an mobile user there do not connect to the wifi, But has walking by the wifi hotspot.
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Mobile devices will transmit probe requests, looking for known networks. These can be detected by using a sniffer. But you need to check multiple channels since you don't know which one the user is transmitting on. Some enterprise-grade access points can scan channels looking for transmitting radios.