Reading WiFi Credentials from an external Library and use them

Projects Programming
1

Hello there.

I'm trying to improve the EPD47 weather station with ESP32.
Because i want it to be portable from WiFi to different WiFi i thought about using the AutoConnect Library. Making a Hotspot and connecting to a WiFI, then use it in my normal Script.
The AutoConnectCredential.h allows access to the stored WiFi Paswords.

So the things i used in my script are:

static uint8_t ssid_test[32], password_test[64];

void creds(){
  AutoConnectCredential  ac(0);
  station_config_t  entry;
  uint8_t  count = ac.entries();          // Get number of entries.
  for (int8_t i = 0; i < count; i++) {    // Loads all entries.
    ac.load(i, &entry);
    Serial.print(String((char *)entry.ssid));
    memcpy(ssid_test, entry.ssid, 32);
    memcpy(password_test, entry.password, 64);
    Serial.print((char *)password_test);

    //ssid_test = (char *)entry.ssid;         //WiFi SSID Names
    //password_test = (char *)entry.password;     //WiFi Passwords
    if (StartWiFi() == WL_CONNECTED) {
    Serial.println("Connected... or such");
    }
    //Connect to each WiFi Here...
  
  }
}

uint8_t StartWiFi() {
  Serial.println("\r\nConnecting to: " + String((char *)ssid_test));
  IPAddress dns(8, 8, 8, 8); // Use Google DNS
  WiFi.disconnect();
  WiFi.mode(WIFI_STA); // switch off AP
  WiFi.setAutoConnect(true);
  WiFi.setAutoReconnect(true);
  //WiFi.begin(ssid_test.c_str(), password_test.c_str());
  WiFi.begin((char *)ssid_test, (char *)password_test);
  if (WiFi.waitForConnectResult() != WL_CONNECTED) {
    Serial.printf("STA: Failed!\n");
    WiFi.disconnect(false);
    delay(500);
    WiFi.begin((char *)ssid_test, (char *)password_test);
  }
  if (WiFi.status() == WL_CONNECTED) {
    wifi_signal = WiFi.RSSI(); // Get Wifi Signal strength now, because the WiFi will be turned off to save power!
    Serial.println("WiFi connected at: " + WiFi.localIP().toString());
  }
  else {
    Serial.println("WiFi connection *** FAILED ***");
    //NoWiFiTurnOff();
  }



  return WiFi.status();
}

The problem is the SerialPrint does show the correct name for WiFI SSID and Password, but it won't connect.
I'm not really a good programer but i assume something went wrong with the conversion?
Anyone has an idea?

OWM_EPD47_epaper_v2.9.ino (56.8 KB)

2

Can you connect to the same WiFi network with your ESP32 if you configure the credentials as literals in the sketch?

3

Thank you for asking, and yes.
Normally it's defined in owm_credentials.h

// Change to your WiFi credentials
const char* ssid     = "none";
const char* password = "empty";

And the AutoConnect Part of the script does successfully connect to a stored network. But that also boots up the AutoConnect Portal.

4

Post the serial output you get and explain what behavior you would have expected.

5

That's the Problem!
The Serial Output is working and showing SSID and Password!
But the WiFi.begin function does NOT work with the input.

6

Here's a fragment of the code I use to connect to WiFi. It prints the WiFi.status while it's connecting and could give you an indication of why it won't connect.

  WiFi.mode(WIFI_STA);
  WiFi.begin(my_ssid, my_password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(WiFi.status()); Serial.print(F(" "));
  }
  Serial.println(F("\nWiFi connected, "));
  Serial.print(F("MAC Address: "));
  Serial.println(WiFi.macAddress());
  Serial.print(F("IP address: "));
  Serial.println(WiFi.localIP());
7

Wouldn't ESP8266WiFiMulti be more appropriate? I have two Wireless Access points in my home in addition to the router. I code the router and access points into my code and on startup the node selects the strongest AP and logs on.

8

definitly the easiest way. But my plan is to gift this device to my boss, so it needs to work in any future WiFI network.
Therefore the Hotspot from AutoConnect library as that has a built in Webpage to connect to any WiFI.

9

Okay...... it works.... i have no clue why... but using you're connection Method it actually works...

C:\Users\Haldi\Documents\Arduino\OWM_EPD47_epaper_v2.9\OWM_EPD47_epaper_v2.9.ino
Starting...
Failed to obtain time
Haldi123412346 6 6 6 3
WiFi connected,
MAC Address: 40:F5:20:55:3B:9C
IP address: 192.168.236.129

The strangest thing is that AFTER your short Test code when the script continues it even connects using the old method which didn't work before...

I don't get it how... but thanks a lot!

10

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.