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Wifi async scan example and fix (#8981)
* Create WiFiScanAsync.ino * Create .skip.esp32h2 * Create README.md * Update README.md - adds C6 * Update wifi.rst with new example * avoid timeout with Async Mode --------- Co-authored-by: Me No Dev <[email protected]>
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Diff for: ‎docs/source/api/wifi.rst

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@@ -643,7 +643,7 @@ Loads all infos from a scanned wifi in to the ptr parameters.
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bool getNetworkInfo(uint8_t networkItem, String &ssid, uint8_t &encryptionType, int32_t &RSSI, uint8_t* &BSSID, int32_t &channel);
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To see how to use the ``WiFiScan``, take a look at the ``WiFiScan.ino`` example available.
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To see how to use the ``WiFiScan``, take a look at the ``WiFiScan.ino`` or ``WiFiScanAsync.ino`` example available.
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Examples
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--------

Diff for: ‎libraries/WiFi/examples/WiFiScan/README.md

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Currently this example supports the following targets.
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| Supported Targets | ESP32 | ESP32-S2 | ESP32-C3 | ESP32-S3 |
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| ----------------- | ----- | -------- | -------- | -------- |
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| Supported Targets | ESP32 | ESP32-S2 | ESP32-C3 | ESP32-S3 | ESP32-C6 |
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| ----------------- | ----- | -------- | -------- | -------- | -------- |
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## How to Use Example
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* ESP32 Datasheet: [Link to datasheet](https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf)
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* ESP32-S2 Datasheet: [Link to datasheet](https://www.espressif.com/sites/default/files/documentation/esp32-s2_datasheet_en.pdf)
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* ESP32-C3 Datasheet: [Link to datasheet](https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf)
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* ESP32-C6 Datasheet: [Link to datasheet](https://www.espressif.com/sites/default/files/documentation/esp32-c6_datasheet_en.pdf)
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* Official ESP-IDF documentation: [ESP-IDF](https://idf.espressif.com)

Diff for: ‎libraries/WiFi/examples/WiFiScanAsync/.skip.esp32h2

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Diff for: ‎libraries/WiFi/examples/WiFiScanAsync/README.md

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# WiFiScanAsync Example
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This example demonstrates how to use the WiFi library to scan available WiFi networks in asynchronous mode and print the results.
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## Supported Targets
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Currently this example supports the following targets.
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| Supported Targets | ESP32 | ESP32-S2 | ESP32-C3 | ESP32-S3 | ESP32-C6 |
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| ----------------- | ----- | -------- | -------- | -------- | -------- |
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## How to Use Example
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* How to install the Arduino IDE: [Install Arduino IDE](https://github.com/espressif/arduino-esp32/tree/master/docs/arduino-ide).
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#### Using Arduino IDE
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* Before Compile/Verify, select the correct board: `Tools -> Board`.
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* Select the COM port: `Tools -> Port: xxx` where the `xxx` is the detected COM port.
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#### Using Platform IO
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* Select the COM port: `Devices` or setting the `upload_port` option on the `platformio.ini` file.
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## Example/Log Output
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```
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Setup done
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Scan start
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Loop running...
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Loop running...
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Loop running...
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Loop running...
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Loop running...
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Loop running...
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Loop running...
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Loop running...
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Loop running...
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Scan done
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17 networks found
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Nr | SSID | RSSI | CH | Encryption
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1 | IoTNetwork | -62 | 1 | WPA2
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2 | WiFiSSID | -62 | 1 | WPA2-EAP
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3 | B3A7992 | -63 | 6 | WPA+WPA2
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4 | WiFi | -63 | 6 | WPA3
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5 | IoTNetwork2 | -64 | 11 | WPA2+WPA3
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...
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```
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## Troubleshooting
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***Important: Be sure you're using a good quality USB cable and you have enought power source for your project.***
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* **Programming Fail:** If the programming/flash procedure fails, try to reduce the serial connection speed.
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* **COM port not detected:** Check the USB cable connection and the USB to Serial driver installation.
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If the error persist, you can ask help at the official [ESP32 forum](https://esp32.com) or see [Contribute](#contribute).
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## Contribute
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To know how to contribute to this project, see [How to contribute.](https://github.com/espressif/arduino-esp32/blob/master/CONTRIBUTING.rst)
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If you have any **feedback** or **issue** to report on this example/library, please open an issue or fix it by creating a new PR. Contributions are more than welcome!
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Before creating a new issue, be sure to try the Troubleshooting and to check if the same issue was already created by someone else.
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## Resources
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* Arduino-ESP32 Official Repository: [espressif/arduino-esp32](https://github.com/espressif/arduino-esp32)
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* ESP32 Datasheet: [Link to datasheet](https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf)
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* ESP32-S2 Datasheet: [Link to datasheet](https://www.espressif.com/sites/default/files/documentation/esp32-s2_datasheet_en.pdf)
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* ESP32-C3 Datasheet: [Link to datasheet](https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf)
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* ESP32-C6 Datasheet: [Link to datasheet](https://www.espressif.com/sites/default/files/documentation/esp32-c6_datasheet_en.pdf)
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* Official ESP-IDF documentation: [ESP-IDF](https://idf.espressif.com)

Diff for: ‎libraries/WiFi/examples/WiFiScanAsync/WiFiScanAsync.ino

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/*
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This sketch demonstrates how to scan WiFi networks in Async Mode.
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The API is based on the Arduino WiFi Shield library, but has significant changes as newer WiFi functions are supported.
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E.g. the return value of `encryptionType()` different because more modern encryption is supported.
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*/
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#include "WiFi.h"
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void startWiFiScan() {
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Serial.println("Scan start");
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// WiFi.scanNetworks will return immediately in Async Mode.
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WiFi.scanNetworks(true); // 'true' turns Async Mode ON
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}
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void printScannedNetworks(uint16_t networksFound) {
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if (networksFound == 0) {
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Serial.println("no networks found");
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} else {
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Serial.println("\nScan done");
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Serial.print(networksFound);
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Serial.println(" networks found");
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Serial.println("Nr | SSID | RSSI | CH | Encryption");
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for (int i = 0; i < networksFound; ++i) {
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// Print SSID and RSSI for each network found
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Serial.printf("%2d", i + 1);
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Serial.print(" | ");
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Serial.printf("%-32.32s", WiFi.SSID(i).c_str());
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Serial.print(" | ");
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Serial.printf("%4ld", WiFi.RSSI(i));
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Serial.print(" | ");
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Serial.printf("%2ld", WiFi.channel(i));
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Serial.print(" | ");
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switch (WiFi.encryptionType(i))
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{
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case WIFI_AUTH_OPEN:
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Serial.print("open");
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break;
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case WIFI_AUTH_WEP:
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Serial.print("WEP");
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break;
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case WIFI_AUTH_WPA_PSK:
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Serial.print("WPA");
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break;
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case WIFI_AUTH_WPA2_PSK:
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Serial.print("WPA2");
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break;
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case WIFI_AUTH_WPA_WPA2_PSK:
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Serial.print("WPA+WPA2");
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break;
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case WIFI_AUTH_WPA2_ENTERPRISE:
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Serial.print("WPA2-EAP");
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break;
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case WIFI_AUTH_WPA3_PSK:
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Serial.print("WPA3");
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break;
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case WIFI_AUTH_WPA2_WPA3_PSK:
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Serial.print("WPA2+WPA3");
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break;
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case WIFI_AUTH_WAPI_PSK:
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Serial.print("WAPI");
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break;
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default:
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Serial.print("unknown");
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}
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Serial.println();
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delay(10);
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}
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Serial.println("");
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// Delete the scan result to free memory for code below.
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WiFi.scanDelete();
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}
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}
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void setup() {
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Serial.begin(115200);
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// Set WiFi to station mode and disconnect from an AP if it was previously connected.
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WiFi.mode(WIFI_STA);
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WiFi.disconnect();
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delay(100);
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Serial.println("Setup done");
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startWiFiScan();
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}
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void loop() {
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// check WiFi Scan Async process
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int16_t WiFiScanStatus = WiFi.scanComplete();
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if (WiFiScanStatus < 0) { // it is busy scanning or got an error
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if (WiFiScanStatus == WIFI_SCAN_FAILED) {
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Serial.println("WiFi Scan has failed. Starting again.");
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startWiFiScan();
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}
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// other option is status WIFI_SCAN_RUNNING - just wait.
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} else { // Found Zero or more Wireless Networks
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printScannedNetworks(WiFiScanStatus);
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startWiFiScan(); // start over...
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}
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// Loop can do something else...
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delay(250);
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Serial.println("Loop running...");
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}

Diff for: ‎libraries/WiFi/src/WiFiScan.cpp

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*/
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int16_t WiFiScanClass::scanComplete()
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{
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if (WiFiScanClass::_scanStarted && (millis()-WiFiScanClass::_scanStarted) > WiFiScanClass::_scanTimeout) { //Check is scan was started and if the delay expired, return WIFI_SCAN_FAILED in this case
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WiFiGenericClass::clearStatusBits(WIFI_SCANNING_BIT);
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return WIFI_SCAN_FAILED;
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}
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if(WiFiGenericClass::getStatusBits() & WIFI_SCAN_DONE_BIT) {
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return WiFiScanClass::_scanCount;
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}
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if(WiFiGenericClass::getStatusBits() & WIFI_SCANNING_BIT) {
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return WIFI_SCAN_RUNNING;
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}
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// last one to avoid time affecting Async mode
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if (WiFiScanClass::_scanStarted && (millis()-WiFiScanClass::_scanStarted) > WiFiScanClass::_scanTimeout) { //Check is scan was started and if the delay expired, return WIFI_SCAN_FAILED in this case
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WiFiGenericClass::clearStatusBits(WIFI_SCANNING_BIT);
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return WIFI_SCAN_FAILED;
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}
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return WIFI_SCAN_FAILED;
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}

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