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m1cr0lab/esp32-wifi-finder.cpp Secret

Last active April 22, 2021 19:13
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  1. m1cr0lab revised this gist Feb 14, 2021. 1 changed file with 20 additions and 3 deletions.
    23 changes: 20 additions & 3 deletions esp32-wifi-finder.cpp
    View file
    Original file line number Diff line number Diff line change
    @@ -1,8 +1,25 @@
    /**
    * This piece of code follows a question about the article posted by Sara & Rui:
    *
    * ESP32 Useful Wi-Fi Library Functions (Arduino IDE)
    * @see https://randomnerdtutorials.com/esp32-useful-wi-fi-functions-arduino/
    *
    * Here is Jim's question:
    *
    * Is there a way to quickly do a WiFi Scan for a SPECIFIC SSID and,
    * when it detects the WiFi SSID is available (or not),
    * does something with this information in the sketch?
    *
    * @see https://randomnerdtutorials.com/esp32-useful-wi-fi-functions-arduino/#comment-555652
    *
    * Here is a simple solution...
    */

    #include <Arduino.h>
    #include <WiFi.h>

    const char * SPECIFIC_SSID = "MyNetwork";
    const char * ENC_TYPE[] = {
    const char * SPECIFIC_SSID = "MyNetwork";
    const char * ENCRYPTION_TYPE[] = {
    "Open",
    "WEP",
    "WPA-PSK",
    @@ -42,7 +59,7 @@ void setup() {
    SPECIFIC_SSID,
    wifi_info.channel,
    wifi_info.rssi,
    ENC_TYPE[wifi_info.auth_mode]);
    ENCRYPTION_TYPE[wifi_info.auth_mode]);
    }

    void loop() {}
  2. m1cr0lab revised this gist Feb 13, 2021. 1 changed file with 4 additions and 4 deletions.
    8 changes: 4 additions & 4 deletions esp32-wifi-finder.cpp
    View file
    Original file line number Diff line number Diff line change
    @@ -1,14 +1,14 @@
    #include <Arduino.h>
    #include <WiFi.h>

    const char* SPECIFIC_SSID = "MyNetwork";
    const char* ENC_TYPE[] = {
    const char * SPECIFIC_SSID = "MyNetwork";
    const char * ENC_TYPE[] = {
    "Open",
    "WEP",
    "WPA-PSK",
    "WPA2-PSK",
    "WPA-WPA2-PSK",
    "WPA2-ENTERPRISE",
    "WPA2-Enterprise",
    "Unknown"
    };

    @@ -19,7 +19,7 @@ struct WiFiInfo {
    wifi_auth_mode_t auth_mode;
    } wifi_info;

    void findWiFi(const char* const ssid, WiFiInfo* const info) {
    void findWiFi(const char * const ssid, WiFiInfo * const info) {
    info->found = false;
    int16_t n = WiFi.scanNetworks();
    for (uint8_t i=0; i<n; ++i) {
  3. m1cr0lab revised this gist Feb 13, 2021. 1 changed file with 5 additions and 5 deletions.
    10 changes: 5 additions & 5 deletions esp32-wifi-finder.cpp
    View file
    Original file line number Diff line number Diff line change
    @@ -5,11 +5,11 @@ const char* SPECIFIC_SSID = "MyNetwork";
    const char* ENC_TYPE[] = {
    "Open",
    "WEP",
    "WPA_PSK",
    "WPA2_PSK",
    "WPA_WPA2_PSK",
    "WPA2_ENTERPRISE",
    "MAX"
    "WPA-PSK",
    "WPA2-PSK",
    "WPA-WPA2-PSK",
    "WPA2-ENTERPRISE",
    "Unknown"
    };

    struct WiFiInfo {
  4. m1cr0lab revised this gist Feb 13, 2021. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion esp32-wifi-finder.cpp
    View file
    Original file line number Diff line number Diff line change
    @@ -19,7 +19,7 @@ struct WiFiInfo {
    wifi_auth_mode_t auth_mode;
    } wifi_info;

    void findWiFi(const char* ssid, WiFiInfo* const info)
    void findWiFi(const char* const ssid, WiFiInfo* const info) {
    info->found = false;
    int16_t n = WiFi.scanNetworks();
    for (uint8_t i=0; i<n; ++i) {
  5. m1cr0lab revised this gist Feb 13, 2021. 1 changed file with 2 additions and 2 deletions.
    4 changes: 2 additions & 2 deletions esp32-wifi-finder.cpp
    View file
    Original file line number Diff line number Diff line change
    @@ -1,7 +1,7 @@
    #include <Arduino.h>
    #include <WiFi.h>

    const char* SPECIFIC_SSID = "YourNetwork";
    const char* SPECIFIC_SSID = "MyNetwork";
    const char* ENC_TYPE[] = {
    "Open",
    "WEP",
    @@ -19,7 +19,7 @@ struct WiFiInfo {
    wifi_auth_mode_t auth_mode;
    } wifi_info;

    void findWiFi(const char *ssid, WiFiInfo *info) {
    void findWiFi(const char* ssid, WiFiInfo* const info)
    info->found = false;
    int16_t n = WiFi.scanNetworks();
    for (uint8_t i=0; i<n; ++i) {
  6. m1cr0lab created this gist Feb 13, 2021.
    48 changes: 48 additions & 0 deletions esp32-wifi-finder.cpp
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,48 @@
    #include <Arduino.h>
    #include <WiFi.h>

    const char* SPECIFIC_SSID = "YourNetwork";
    const char* ENC_TYPE[] = {
    "Open",
    "WEP",
    "WPA_PSK",
    "WPA2_PSK",
    "WPA_WPA2_PSK",
    "WPA2_ENTERPRISE",
    "MAX"
    };

    struct WiFiInfo {
    bool found;
    int32_t channel;
    int32_t rssi;
    wifi_auth_mode_t auth_mode;
    } wifi_info;

    void findWiFi(const char *ssid, WiFiInfo *info) {
    info->found = false;
    int16_t n = WiFi.scanNetworks();
    for (uint8_t i=0; i<n; ++i) {
    if (strcmp(WiFi.SSID(i).c_str(), ssid) == 0) {
    info->found = true;
    info->channel = WiFi.channel(i);
    info->rssi = WiFi.RSSI(i);
    info->auth_mode = WiFi.encryptionType(i);
    return;
    }
    }
    }

    void setup() {
    Serial.begin(115200);
    findWiFi(SPECIFIC_SSID, &wifi_info);
    Serial.printf(wifi_info.found
    ? "SSID: %s, channel: %i, RSSI: %i dBm, encryption: %s\n"
    : "SSID: %s ... could not be found\n",
    SPECIFIC_SSID,
    wifi_info.channel,
    wifi_info.rssi,
    ENC_TYPE[wifi_info.auth_mode]);
    }

    void loop() {}