ESP32 and WPS

Projects Networking, Protocols, and Devices
1

Happy New Year to all. I was playing with a Lolin32 Pro (which obviously has an ESP-32) and I was trying one of the examples for using the WPS button.

/* Example Code To Get ESP32 To Connect To A Router Using WPS =========================================================== This example code provides both Push Button method and Pin based WPS entry to get your ESP connected to your WiFi router. Hardware Requirements ======================== ESP32 and a Router having atleast one WPS functionality This code is under Public Domain License. Author: Pranav Cherukupalli <cherukupallip@gmail.com> */ #include "WiFi.h" #include "esp_wps.h" /* Change the definition of the WPS mode from WPS_TYPE_PBC to WPS_TYPE_PIN in the case that you are using pin type WPS */ #define ESP_WPS_MODE      WPS_TYPE_PBC #define ESP_MANUFACTURER  "ESPRESSIF" #define ESP_MODEL_NUMBER  "ESP32" #define ESP_MODEL_NAME    "ESPRESSIF IOT" #define ESP_DEVICE_NAME  "ESP STATION" static esp_wps_config_t config; void wpsInitConfig(){   config.crypto_funcs = &g_wifi_default_wps_crypto_funcs;   config.wps_type = ESP_WPS_MODE;   strcpy(config.factory_info.manufacturer, ESP_MANUFACTURER);   strcpy(config.factory_info.model_number, ESP_MODEL_NUMBER);   strcpy(config.factory_info.model_name, ESP_MODEL_NAME);   strcpy(config.factory_info.device_name, ESP_DEVICE_NAME); } String wpspin2string(uint8_t a[]){   char wps_pin[9];   for(int i=0;i<8;i++){     wps_pin[i] = a[i];   }   wps_pin[8] = '\0';   return (String)wps_pin; } void WiFiEvent(WiFiEvent_t event, system_event_info_t info){   switch(event){     case SYSTEM_EVENT_STA_START:       Serial.println("Station Mode Started");       break;     case SYSTEM_EVENT_STA_GOT_IP:       Serial.println("Connected to :" + String(WiFi.SSID()));       Serial.print("Got IP: ");       Serial.println(WiFi.localIP());       break;     case SYSTEM_EVENT_STA_DISCONNECTED:       Serial.println("Disconnected from station, attempting reconnection");       WiFi.reconnect();       break;     case SYSTEM_EVENT_STA_WPS_ER_SUCCESS:       Serial.println("WPS Successfull, stopping WPS and connecting to: " + String(WiFi.SSID()));       esp_wifi_wps_disable();       delay(10);       WiFi.begin();       break;     case SYSTEM_EVENT_STA_WPS_ER_FAILED:       Serial.println("WPS Failed, retrying");       esp_wifi_wps_disable();       esp_wifi_wps_enable(&config);       esp_wifi_wps_start(0);       break;     case SYSTEM_EVENT_STA_WPS_ER_TIMEOUT:       Serial.println("WPS Timedout, retrying");       esp_wifi_wps_disable();       esp_wifi_wps_enable(&config);       esp_wifi_wps_start(0);       break;     case SYSTEM_EVENT_STA_WPS_ER_PIN:       Serial.println("WPS_PIN = " + wpspin2string(info.sta_er_pin.pin_code));       break;     default:       break;   } } void setup(){   Serial.begin(115200);   delay(10);   Serial.println();   WiFi.onEvent(WiFiEvent);   WiFi.mode(WIFI_MODE_STA);   Serial.println("Starting WPS");   wpsInitConfig();   esp_wifi_wps_enable(&config);   esp_wifi_wps_start(0); } void loop(){   //nothing to do here }

I would like to know if it is possible to take the SSID and PASSWORD received via WPS and save it in the SD.
I ask this because if the connection is done with the WPS when the board is reset the credentials remain stored but, if the electricity obviously everything is lost and I do not like it very much.
I would like to do something like this: I read the credentials from SD, I try to connect, if I match OK otherwise I force a connection with the WPS.

Suggestions?

2

This is my solution

/*   Example Code To Get ESP32 To Connect To A Router Using WPS   ===========================================================   This example code provides both Push Button method and Pin   based WPS entry to get your ESP connected to your WiFi router.   Hardware Requirements   ========================   ESP32 and a Router having atleast one WPS functionality   This code is under Public Domain License.   Author:   Pranav Cherukupalli <cherukupallip@gmail.com> */ //---------------------------------- VARIABILI PER IL CONTROLLO DELLA CONNESSIONE ATTIVA --------------------------------- unsigned long previousMillisWiFi = 0; // Memorizza l'ultimo volta che l'evento è stato aggiornato long intervalWiFi = 6000; // Variabile per l'intervallo di tempo tra un tentativo di connessione e l'altro. #include "WiFi.h" #include "esp_wps.h" /*   Change the definition of the WPS mode   from WPS_TYPE_PBC to WPS_TYPE_PIN in   the case that you are using pin type   WPS */ #define ESP_WPS_MODE      WPS_TYPE_PBC #define ESP_MANUFACTURER  "ESPRESSIF" #define ESP_MODEL_NUMBER  "ESP32" #define ESP_MODEL_NAME    "ESPRESSIF IOT" #define ESP_DEVICE_NAME  "ESP STATION" static esp_wps_config_t config; void wpsInitConfig() {   config.crypto_funcs = &g_wifi_default_wps_crypto_funcs;   config.wps_type = ESP_WPS_MODE;   strcpy(config.factory_info.manufacturer, ESP_MANUFACTURER);   strcpy(config.factory_info.model_number, ESP_MODEL_NUMBER);   strcpy(config.factory_info.model_name, ESP_MODEL_NAME);   strcpy(config.factory_info.device_name, ESP_DEVICE_NAME); } String wpspin2string(uint8_t a[]) {   char wps_pin[9];   for (int i = 0; i < 8; i++) {     wps_pin[i] = a[i];   }   wps_pin[8] = '\0';   return (String)wps_pin; } void WiFiEvent(WiFiEvent_t event, system_event_info_t info) {   switch (event) {     case SYSTEM_EVENT_STA_START:       Serial.println("Station Mode Started");       break;     case SYSTEM_EVENT_STA_GOT_IP:       Serial.println("Connected to :" + String(WiFi.SSID()));       Serial.print("Got IP: ");       Serial.println(WiFi.localIP());       break;     case SYSTEM_EVENT_STA_DISCONNECTED:       Serial.println("Disconnected from station, attempting reconnection");       WiFi.reconnect();       break;     case SYSTEM_EVENT_STA_WPS_ER_SUCCESS:       Serial.println("WPS Successfull, stopping WPS and connecting to: " + String(WiFi.SSID()));       esp_wifi_wps_disable();       delay(10);       WiFi.begin();       break;     case SYSTEM_EVENT_STA_WPS_ER_FAILED:       Serial.println("WPS Failed, retrying");       esp_wifi_wps_disable();       esp_wifi_wps_enable(&config);       esp_wifi_wps_start(0);       break;     case SYSTEM_EVENT_STA_WPS_ER_TIMEOUT:       Serial.println("WPS Timedout, retrying");       esp_wifi_wps_disable();       esp_wifi_wps_enable(&config);       esp_wifi_wps_start(0);       break;     case SYSTEM_EVENT_STA_WPS_ER_PIN:       Serial.println("WPS_PIN = " + wpspin2string(info.sta_er_pin.pin_code));       break;     default:       break;   } } void setup() {   Serial.begin(115200);   delay(10);   Serial.println();   Serial.println("Avvio la WiFi");   WiFi.begin();   Serial.print("Connessione all'ultimo AP");   while (WiFi.status() != WL_CONNECTED) {     if (previousMillisWiFi < intervalWiFi)     {       previousMillisWiFi = millis();       Serial.print(".");       delay(500);     }     else break;   }   if (WiFi.status() != WL_CONNECTED) {     WiFi.onEvent(WiFiEvent);     WiFi.mode(WIFI_MODE_STA);     Serial.println("Starting WPS");     wpsInitConfig();     esp_wifi_wps_enable(&config);     esp_wifi_wps_start(0);   }   else {     Serial.println();     Serial.print("Connesso a: ");     Serial.println(WiFi.SSID());     Serial.print("IP Address: ");     Serial.println(WiFi.localIP());   } } void loop() {   //nothing to do here }