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Add FTM support and examples (espressif#5272)
Rework of espressif#5266 by @pedrominatel
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‎libraries/WiFi/examples/FTM/FTM_Initiator/FTM_Initiator.ino

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/* Wi-Fi FTM Initiator Arduino Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include "WiFi.h"
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/*
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THIS FEATURE IS SUPPORTED ONLY BY ESP32-S2 AND ESP32-C3
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*/
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// Change the SSID and PASSWORD here if needed
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const char * WIFI_FTM_SSID = "WiFi_FTM_Responder"; // SSID of AP that has FTM Enabled
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const char * WIFI_FTM_PASS = "ftm_responder"; // STA Password
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// FTM settings
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// Number of FTM frames requested in terms of 4 or 8 bursts (allowed values - 0 (No pref), 16, 24, 32, 64)
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const uint8_t FTM_FRAME_COUNT = 16;
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// Requested time period between consecutive FTM bursts in 100’s of milliseconds (allowed values - 0 (No pref) or 2-255)
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const uint16_t FTM_BURST_PERIOD = 2;
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// Semaphore to signal when FTM Report has been received
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xSemaphoreHandle ftmSemaphore;
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// Status of the received FTM Report
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bool ftmSuccess = true;
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// FTM report handler with the calculated data from the round trip
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void onFtmReport(arduino_event_t *event) {
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const char * status_str[5] = {"SUCCESS", "UNSUPPORTED", "CONF_REJECTED", "NO_RESPONSE", "FAIL"};
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wifi_event_ftm_report_t * report = &event->event_info.wifi_ftm_report;
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// Set the global report status
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ftmSuccess = report->status == FTM_STATUS_SUCCESS;
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if (ftmSuccess) {
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// The estimated distance in meters may vary depending on some factors (see README file)
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Serial.printf("FTM Estimate: Distance: %.2f m, Return Time: %u ns\n", (float)report->dist_est / 100.0, report->rtt_est);
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// Pointer to FTM Report with multiple entries, should be freed after use
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free(report->ftm_report_data);
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} else {
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Serial.print("FTM Error: ");
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Serial.println(status_str[report->status]);
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}
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// Signal that report is received
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xSemaphoreGive(ftmSemaphore);
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}
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// Initiate FTM Session and wait for FTM Report
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bool getFtmReport(){
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if(!WiFi.initiateFTM(FTM_FRAME_COUNT, FTM_BURST_PERIOD)){
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Serial.println("FTM Error: Initiate Session Failed");
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return false;
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}
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// Wait for signal that report is received and return true if status was success
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return xSemaphoreTake(ftmSemaphore, portMAX_DELAY) == pdPASS && ftmSuccess;
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}
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void setup() {
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Serial.begin(115200);
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// Create binary semaphore (initialized taken and can be taken/given from any thread/ISR)
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ftmSemaphore = xSemaphoreCreateBinary();
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// Listen for FTM Report events
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WiFi.onEvent(onFtmReport, ARDUINO_EVENT_WIFI_FTM_REPORT);
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// Connect to AP that has FTM Enabled
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Serial.println("Connecting to FTM Responder");
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WiFi.begin(WIFI_FTM_SSID, WIFI_FTM_PASS);
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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Serial.print(".");
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}
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Serial.println("");
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Serial.println("WiFi Connected");
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Serial.print("Initiating FTM session with Frame Count ");
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Serial.print(FTM_FRAME_COUNT);
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Serial.print(" and Burst Period ");
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Serial.print(FTM_BURST_PERIOD * 100);
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Serial.println(" ms");
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// Request FTM reports until one fails
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while(getFtmReport());
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}
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void loop() {
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delay(1000);
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}

‎libraries/WiFi/examples/FTM/FTM_Initiator/README.md

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# Wi-Fi FTM Initiator Arduino Example
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This example demonstrates how to use the Fine Timing Measurement (FTM) to calculate the distace from the Access Point and the device. This is calculated by the Wi-Fi Round Trip Time (Wi-Fi RTT) introduced on the [IEEE Std 802.11-2016](https://en.wikipedia.org/wiki/IEEE_802.11mc) standard.
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This example was based on the [ESP-IDF FTM](https://github.com/espressif/esp-idf/tree/master/examples/wifi/ftm). See the README file for more details about on how to use this feature.
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Some usages for this feature includes:
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* Indoor positioning systems.
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* Navigation.
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* Device Location.
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* Smart Devices.
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* Alarms.
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# Supported Targets
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Currently, this example supports the following targets:
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| Supported Targets | ESP32-S2 | ESP32-C3 |
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| ----------------- | -------- | -------- |
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## How to Use Example
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In order to use the FTM, you will need a Responder or Wi-Fi router with FTM capabilities. If you don't own one, you can use a second ESP32-S2 or ESP32-C3 to simulate one.
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See the **Responder** example to prepare the environment.
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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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### Configure the Project
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To configure this project, you can change the following configuration related to FTM feature:
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```c
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// Change the SSID and PASSWORD here if needed
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const char * WIFI_FTM_SSID = "WiFi_FTM_Responder"; // SSID of AP that has FTM Enabled
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const char * WIFI_FTM_PASS = "ftm_responder"; // STA Password
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// FTM settings
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// Number of FTM frames requested in terms of 4 or 8 bursts (allowed values - 0 (No pref), 16, 24, 32, 64)
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const uint8_t FTM_FRAME_COUNT = 16;
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// Requested time period between consecutive FTM bursts in 100’s of milliseconds (allowed values - 0 (No pref) or 2-255)
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const uint16_t FTM_BURST_PERIOD = 2;
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```
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* Change the Wi-Fi `SSID` and `PASSWORD` as the same as the Responder/Router.
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* Change `FTM_FRAME_COUNT` with the number of frames requested to the Responder.
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* Change `FTM_BURST_PERIOD` with the time between each FTM burst.
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To see more details about FTM, please see the [ESP-IDF docs](https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/api-reference/network/esp_wifi.html).
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#### Using Arduino IDE
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To get more information about the Espressif boards see [Espressif Development Kits](https://www.espressif.com/en/products/devkits).
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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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## Log Output
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Expected log output:
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```
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ESP-ROM:esp32s2-rc4-20191025
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Build:Oct 25 2019
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rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT)
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SPIWP:0xee
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mode:DIO, clock div:1
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load:0x3ffe6100,len:0x4b0
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load:0x4004c000,len:0xa6c
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load:0x40050000,len:0x25c4
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entry 0x4004c198
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Connecting to FTM Responder
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.....
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WiFi Connected
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Initiating FTM session with Frame Count 16 and Burst Period 200 ms
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FTM Estimate: Distance: 0.13 m, Return Time: 0 ns
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FTM Estimate: Distance: 0.13 m, Return Time: 0 ns
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FTM Estimate: Distance: 0.13 m, Return Time: 0 ns
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FTM Estimate: Distance: 0.00 m, Return Time: 0 ns
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...
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```
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## Troubleshooting
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***Important: Make sure you are using a good quality USB cable and that you have a reliable power source.***
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* **Programming Fail:** If the programming/flash procedure fails, try reducing the serial connection speed.
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* **COM port not detected:** Check the USB cable and the USB to Serial driver installation.
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If the error persist, you can ask for 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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* Official ESP32 Forum: [Link](https://esp32.com)
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* Arduino-ESP32 Official Repository: [espressif/arduino-esp32](https://github.com/espressif/arduino-esp32)
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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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* Official ESP-IDF documentation: [ESP-IDF](https://idf.espressif.com)

‎libraries/WiFi/examples/FTM/FTM_Responder/FTM_Responder.ino

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/* Wi-Fi FTM Responder Arduino Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
8+
*/
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#include "WiFi.h"
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// Change the SSID and PASSWORD here if needed
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const char * WIFI_FTM_SSID = "WiFi_FTM_Responder";
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const char * WIFI_FTM_PASS = "ftm_responder";
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void setup() {
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Serial.begin(115200);
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Serial.println("Starting SoftAP with FTM Responder support");
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// Enable AP with FTM support (last argument is 'true')
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WiFi.softAP(WIFI_FTM_SSID, WIFI_FTM_PASS, 1, 0, 4, true);
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}
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void loop() {
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delay(1000);
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}

‎libraries/WiFi/examples/FTM/FTM_Responder/README.md

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# Wi-Fi FTM Responder Arduino Example
2+
3+
This example demonstrates how to use the Fine Timing Measurement (FTM) to calculate the distace from the Access Point and the device. This is calculated by the Wi-Fi Round Trip Time (Wi-Fi RTT) introduced on the [IEEE Std 802.11-2016](https://en.wikipedia.org/wiki/IEEE_802.11mc) standard.
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5+
This example will simulate the Router with FTM capability.
6+
7+
This example was based on the [ESP-IDF FTM](https://github.com/espressif/esp-idf/tree/master/examples/wifi/ftm). See the README file for more details about on how to use this feature.
8+
9+
Some usages for this feature includes:
10+
11+
* Indoor positioning systems.
12+
* Navigation.
13+
* Device Location.
14+
* Smart Devices.
15+
* Alarms.
16+
17+
# Supported Targets
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Currently, this example supports the following targets:
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| Supported Targets | ESP32-S2 | ESP32-C3 |
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| ----------------- | -------- | -------- |
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## How to Use Example
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See the **Initiator** example to prepare the environment.
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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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### Configure the Project
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To configure this project, you can change the following configuration related to STA:
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```c
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// Change the SSID and PASSWORD here if needed
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const char * WIFI_FTM_SSID = "WiFi_FTM_Responder";
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const char * WIFI_FTM_PASS = "ftm_responder";
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```
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* Change the Wi-Fi `SSID` and `PASSWORD` as the same as the Initiator.
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To see more details about FTM, please see the [ESP-IDF docs](https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/api-reference/network/esp_wifi.html).
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#### Using Arduino IDE
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To get more information about the Espressif boards see [Espressif Development Kits](https://www.espressif.com/en/products/devkits).
47+
48+
* Before Compile/Verify, select the correct board: `Tools -> Board`.
49+
* Select the COM port: `Tools -> Port: xxx` where the `xxx` is the detected COM port.
50+
51+
#### Using Platform IO
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53+
* Select the COM port: `Devices` or setting the `upload_port` option on the `platformio.ini` file.
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55+
## Log Output
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Expected log output:
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```
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Build:Oct 25 2019
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rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT)
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SPIWP:0xee
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mode:DIO, clock div:1
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load:0x3ffe6100,len:0x4b0
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load:0x4004c000,len:0xa6c
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load:0x40050000,len:0x25c4
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entry 0x4004c198
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Starting SoftAP with FTM Responder support
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```
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## Troubleshooting
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***Important: Make sure you are using a good quality USB cable and that you have a reliable power source.***
74+
75+
* **Programming Fail:** If the programming/flash procedure fails, try reducing the serial connection speed.
76+
* **COM port not detected:** Check the USB cable and the USB to Serial driver installation.
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If the error persist, you can ask for 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)
83+
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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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* Official ESP32 Forum: [Link](https://esp32.com)
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* Arduino-ESP32 Official Repository: [espressif/arduino-esp32](https://github.com/espressif/arduino-esp32)
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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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* Official ESP-IDF documentation: [ESP-IDF](https://idf.espressif.com)

‎libraries/WiFi/src/WiFiAP.cpp

+8-4
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@@ -81,18 +81,22 @@ static bool softap_config_equal(const wifi_config_t& lhs, const wifi_config_t& r
8181
if(lhs.ap.pairwise_cipher != rhs.ap.pairwise_cipher) {
8282
return false;
8383
}
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if(lhs.ap.ftm_responder != rhs.ap.ftm_responder) {
85+
return false;
86+
}
8487
return true;
8588
}
8689

87-
void wifi_softap_config(wifi_config_t *wifi_config, const char * ssid=NULL, const char * password=NULL, uint8_t channel=6, wifi_auth_mode_t authmode=WIFI_AUTH_WPA2_PSK, uint8_t ssid_hidden=0, uint8_t max_connections=4, uint16_t beacon_interval=100){
88-
wifi_config->ap.channel = channel;
90+
void wifi_softap_config(wifi_config_t *wifi_config, const char * ssid=NULL, const char * password=NULL, uint8_t channel=6, wifi_auth_mode_t authmode=WIFI_AUTH_WPA2_PSK, uint8_t ssid_hidden=0, uint8_t max_connections=4, bool ftm_responder=false, uint16_t beacon_interval=100){
91+
wifi_config->ap.channel = channel;
8992
wifi_config->ap.max_connection = max_connections;
9093
wifi_config->ap.beacon_interval = beacon_interval;
9194
wifi_config->ap.ssid_hidden = ssid_hidden;
9295
wifi_config->ap.authmode = WIFI_AUTH_OPEN;
9396
wifi_config->ap.ssid_len = 0;
9497
wifi_config->ap.ssid[0] = 0;
9598
wifi_config->ap.password[0] = 0;
99+
wifi_config->ap.ftm_responder = ftm_responder;
96100
if(ssid != NULL && ssid[0] != 0){
97101
snprintf((char*)wifi_config->ap.ssid, 32, ssid);
98102
wifi_config->ap.ssid_len = strlen(ssid);
@@ -117,7 +121,7 @@ void wifi_softap_config(wifi_config_t *wifi_config, const char * ssid=NULL, cons
117121
* @param ssid_hidden Network cloaking (0 = broadcast SSID, 1 = hide SSID)
118122
* @param max_connection Max simultaneous connected clients, 1 - 4.
119123
*/
120-
bool WiFiAPClass::softAP(const char* ssid, const char* passphrase, int channel, int ssid_hidden, int max_connection)
124+
bool WiFiAPClass::softAP(const char* ssid, const char* passphrase, int channel, int ssid_hidden, int max_connection, bool ftm_responder)
121125
{
122126

123127
if(!WiFi.enableAP(true)) {
@@ -140,7 +144,7 @@ bool WiFiAPClass::softAP(const char* ssid, const char* passphrase, int channel,
140144

141145
wifi_config_t conf;
142146
wifi_config_t conf_current;
143-
wifi_softap_config(&conf, ssid, passphrase, channel, WIFI_AUTH_WPA2_PSK, ssid_hidden, max_connection);
147+
wifi_softap_config(&conf, ssid, passphrase, channel, WIFI_AUTH_WPA2_PSK, ssid_hidden, max_connection, ftm_responder);
144148
esp_err_t err = esp_wifi_get_config((wifi_interface_t)WIFI_IF_AP, &conf_current);
145149
if(err){
146150
log_e("get AP config failed");

‎libraries/WiFi/src/WiFiAP.h

+1-1
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@@ -37,7 +37,7 @@ class WiFiAPClass
3737

3838
public:
3939

40-
bool softAP(const char* ssid, const char* passphrase = NULL, int channel = 1, int ssid_hidden = 0, int max_connection = 4);
40+
bool softAP(const char* ssid, const char* passphrase = NULL, int channel = 1, int ssid_hidden = 0, int max_connection = 4, bool ftm_responder = false);
4141
bool softAPConfig(IPAddress local_ip, IPAddress gateway, IPAddress subnet);
4242
bool softAPdisconnect(bool wifioff = false);
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