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esp-idf/examples/wifi/scan/README.md

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Supported Targets ESP32 ESP32-C2 ESP32-C3 ESP32-C5 ESP32-C6 ESP32-C61 ESP32-S2 ESP32-S3

Wi-Fi Scan Example

(See the README.md file in the upper level 'examples' directory for more information about examples.)

This example shows how to scan for available set of APs.

How to use example

Before project configuration and build, be sure to set the correct chip target using idf.py set-target <chip_name>.

Hardware Required

  • A development board with ESP32/ESP32-S2/ESP32-C3 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.).
  • A USB cable for Power supply and programming.

Configure the project

Open the project configuration menu (idf.py menuconfig).

In the Example Configuration menu:

  • Set the Example configuration.
    • Use Max size of scan list to set the maximum number of access points in the list.
    • Use 'Scan Channel list' to list specific channels you wish to scan. For eg. 1,6,9,11. By Default all channels will be scanned.

Build and Flash

Build the project and flash it to the board, then run the monitor tool to view the serial output:

Run idf.py -p PORT flash monitor to build, flash and monitor the project.

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for all the steps to configure and use the ESP-IDF to build projects.

Example Output

As you run the example, you will see the following log:

I (443) wifi:wifi firmware version: 6bff005
I (443) wifi:wifi certification version: v7.0
I (443) wifi:config NVS flash: enabled
I (443) wifi:config nano formatting: disabled
I (453) wifi:Init data frame dynamic rx buffer num: 32
I (453) wifi:Init management frame dynamic rx buffer num: 32
I (463) wifi:Init management short buffer num: 32
I (463) wifi:Init dynamic tx buffer num: 32
I (473) wifi:Init static tx FG buffer num: 2
I (473) wifi:Init static rx buffer size: 1600
I (473) wifi:Init static rx buffer num: 10
I (483) wifi:Init dynamic rx buffer num: 32
I (483) wifi_init: rx ba win: 6
I (493) wifi_init: tcpip mbox: 32
I (493) wifi_init: udp mbox: 6
I (493) wifi_init: tcp mbox: 6
I (503) wifi_init: tcp tx win: 5744
I (503) wifi_init: tcp rx win: 5744
I (513) wifi_init: tcp mss: 1440
I (513) wifi_init: WiFi IRAM OP enabled
I (513) wifi_init: WiFi RX IRAM OP enabled
I (533) phy_init: phy_version 300,6e46ba7,Jan 25 2021
I (683) wifi:set rx active PTI: 0, rx ack PTI: 0, and default PTI: 0
I (683) wifi:mode : sta (7c:df:a1:40:23:84)
I (683) wifi:enable tsf
I (2783) scan: Total APs scanned = 17
I (2783) scan: SSID 		IoTNetwork
I (2783) scan: RSSI 		-50
I (2783) scan: Authmode 	WIFI_AUTH_WPA2_PSK
I (2783) scan: Pairwise Cipher 	WIFI_CIPHER_TYPE_CCMP
I (2793) scan: Group Cipher 	WIFI_CIPHER_TYPE_CCMP
I (2793) scan: Channel 		5

I (2883) scan: SSID 		TP-Link_6872
I (2883) scan: RSSI 		-70
I (2883) scan: Authmode 	WIFI_AUTH_WPA_WPA2_PSK
I (2893) scan: Pairwise Cipher 	WIFI_CIPHER_TYPE_CCMP
I (2893) scan: Group Cipher 	WIFI_CIPHER_TYPE_CCMP
I (2903) scan: Channel 		11
...

Troubleshooting

For any technical queries, please open an issue on GitHub. We will get back to you soon.