wifi/scan/mcu_host

| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-S2 | ESP32-S3 | ESP32-P4 | ESP32-H2 |
| ----------------- | ----- | -------- | -------- | -------- | --------- | -------- | -------- | -------- | -------- | -------- |

# 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 `eh.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 (`eh.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 `eh.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.

* [ESP-IDF Getting Started Guide on ESP32](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/index.html)
* [ESP-IDF Getting Started Guide on ESP32-S2](https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/get-started/index.html)
* [ESP-IDF Getting Started Guide on ESP32-C3](https://docs.espressif.com/projects/esp-idf/en/latest/esp32c3/get-started/index.html)

## 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
...
```

## Running the example on ESP Chips without Wi-Fi

This example can run on ESP Chips without Wi-Fi using ESP-Hosted. See the [upper level `README.md`](../README.md) for information on the two-chip solution.

## Troubleshooting

For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.