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An ESP32 can pass selected Wi-Fi frames to your application in promiscuous mode, making it possible to display observations and count deauthentication frames. That is monitoring, not proof of an attack: a frame alone cannot establish intent or identify who sent it. This part of the build explains the documented capabilities, the processing limits, and how to frame a portal around authorized observation.
What this part of the ESP32 multi-tool can do
Espressif’s ESP-IDF Wi-Fi reference documents station, Soft-AP, concurrent AP/station operation, scanning, and promiscuous monitoring. Together, these APIs provide building blocks for a device that observes selected Wi-Fi frames and presents local status or scan results. They do not, by themselves, create a web server or a captive portal.
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Use the monitor only on networks and in environments where you are authorized to observe traffic. Treat the displayed data as observations, not as a complete record of all wireless activity.
How promiscuous packet monitoring works
In promiscuous mode, the Wi-Fi driver can pass configured categories of 802.11 frames to an application callback. The ESP-IDF Wi-Fi Modes guide lists management, data, control, and CRC-error frames among the available categories. Filters determine what reaches the application; other 802.11 error frames are not delivered. This is not an assurance that every packet or every frame type will be captured.
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Capture scope also depends on the project’s radio and channel configuration. The cited documentation establishes promiscuous monitoring and filtering, but does not specify a channel strategy for this build. Make the active channel and filter choices visible in the interface so readers can interpret what the device is observing.
Keep the Wi-Fi callback short
The promiscuous callback runs in the Wi-Fi driver task. Espressif warns that sniffing can significantly affect station or access-point throughput and recommends posting an event to an application task when frame processing is substantial. Keep callback work limited to the minimum needed to hand off an observation; do parsing, aggregation, and portal updates elsewhere.
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Can an ESP32 detect deauthentication attacks?
It can observe and count deauthentication management frames. Espressif describes authentication/deauthentication and association/disassociation as management frames involved in connecting a station to an access point, and notes that spoofed management frames can be used in denial-of-service and man-in-the-middle attacks. But seeing a deauthentication frame does not prove it was malicious, establish that a client was successfully disconnected, or identify its sender.
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Use PMF as a defense where supported
Protected Management Frames (PMF) add integrity protection for broadcast management frames and protect against specified spoofed management-frame attacks. Espressif documents PMF support in ESP32 station and Soft-AP modes in its ESP-IDF v6.1 Wi-Fi Security guide. PMF is Optional by default in the documented configuration. PMF Required can be selected, but the device will then connect only to a peer that supports PMF.
PMF settings are relevant to the ESP32’s own station or access-point connections; they do not make the multi-tool a protection mechanism for other devices on the network. For broader network security, configure the actual access point and clients appropriately.
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Present observations in a web portal
A portal can show the device’s mode, selected channel and filters, scan results, and frame counters. The ESP-IDF API supports Soft-AP and concurrent AP/station operation. The Arduino-ESP32 Wi-Fi API documents scans that can return SSID, encryption type, RSSI, BSSID, and channel, and links examples for access-point and station modes.
Those Wi-Fi features are ingredients, not an automatic portal implementation. The web server, DNS handling, authentication, and whether phones automatically display a portal are separate project choices; the cited APIs do not establish a particular user experience. Keep the interface limited to status, configuration, and observations from authorized monitoring, and avoid presenting scan or frame data as a complete view of the network.
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- 2.4GHz Dual Mode WiFi + Bluetooth Development Board
- Ultra-Low power consumption, works perfectly with the Arduino IDE
- Support LWIP protocol, Freertos
- SupportThree Modes: AP, STA, and AP+STA
- ESP32 is a safe, reliable, and scalable to a variety of applications
Choose the framework and operating mode deliberately
| Approach | Documented capability | What the project must decide |
|---|---|---|
| ESP-IDF | Station, Soft-AP, AP+STA, scanning, promiscuous monitoring, and frame filtering are documented in the Wi-Fi reference. | Frame filters, radio/channel configuration, callback handoff, and how the portal is implemented. |
| Arduino-ESP32 | Wi-Fi scanning returns network details including SSID, encryption type, RSSI, BSSID, and channel; the API links AP and station examples. | The exact monitoring and portal implementation. The cited Arduino API material does not establish a particular portal design. |
In either framework, promiscuous monitoring can reduce Wi-Fi throughput. If the device also serves a Soft-AP or maintains a station connection, account for that impact and keep packet work out of the driver callback. The sources establish available modes and APIs, not a tested performance figure for this particular build.
Quick Recap
What to verify before assembling the build
- Confirm the exact ESP32 board, framework, and firmware version; the documented capabilities do not identify a specific board or compatibility combination.
- Decide whether the device will operate as a station, a Soft-AP, or both, and document the channel and frame filters used.
- Keep processing lightweight in the driver callback and move substantial work to an application task.
- Make clear that frame counts and alerts are observations, not confirmation of hostile intent or attribution.
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