ESP32: How to change WiFi SSID using access point with Arduino IOT cloud running

Question

I have been trying to use WiFi.h, WebServer.h and EEPROM.h together with ArduinoIoTCloud.h and Arduino_ConnectionHandler.h to be able to change the WiFi credentials if required without changing the sketch and reuploading it. The problem is when moving;

WiFiConnectionHandler ArduinoIoTPreferredConnection(SSID, PASS)

inside void setup() wouldn't work whether with constant char of the credentials or after modifying it to read from the EEPROM, like

WiFiConnectionHandler ArduinoIoTPreferredConnection(esid.c_str(), epass.c_str());

Please, is there any way to change the WiFi credentials from a web browser?

The Code

#include <ArduinoIoTCloud.h>
#include <Arduino_ConnectionHandler.h>

const char DEVICE_LOGIN_NAME[]  = "********************";

const char SSID[]               = "SECRET_SSID";    // Network SSID (name)
const char PASS[]               = "SECRET_OPTIONAL_PASS";    // Network password (use for WPA, or use as key for WEP)
const char DEVICE_KEY[]  = "SECRET_DEVICE_KEY";    // Secret device password

void onTemperatureChange();

float temperature;

void initProperties()
{
  ArduinoCloud.setBoardId(DEVICE_LOGIN_NAME);
  ArduinoCloud.setSecretDeviceKey(DEVICE_KEY);
  ArduinoCloud.addProperty(temperature, READWRITE, ON_CHANGE, onTemperatureChange);
}

WiFiConnectionHandler ArduinoIoTPreferredConnection(SSID, PASS);

void setup() {
  Serial.begin(9600);
  delay(1500); 
  initProperties();

  ArduinoCloud.begin(ArduinoIoTPreferredConnection);
  

  setDebugMessageLevel(2);
  ArduinoCloud.printDebugInfo();
}

void loop() {
  ArduinoCloud.update(); 
}


void onTemperatureChange()  {
}

So, when I add the code for the access point to write and read from the EEPROM, I then, o my knowledge, need to move this line inside the void setup.

WiFiConnectionHandler ArduinoIoTPreferredConnection(SSID, PASS);

For example



void setup() {

  Serial.begin(9600);
  delay(1500); 
// Code for reading from EEPROM and the eeprom_SSID and eeprom_SSID_PASS will then pass to SSID and PASS Chars
//
  initProperties();
WiFiConnectionHandler ArduinoIoTPreferredConnection(SSID, PASS);

  ArduinoCloud.begin(ArduinoIoTPreferredConnection);
  

  setDebugMessageLevel(2);
  ArduinoCloud.printDebugInfo();
}

After that, the ESP will be pushed to restart as the IoT library doesn't find the SSID and PASS.

I have tried to do so with Blynk and many other libraries, and it worked; I could enter the credentail by activating a server and creating an access point to do so, and then blynk read from that and connected perfectly. The problem is that I have to use the Arduino IoT cloud, not Blynk. Thanks for your support.

Luca · Accepted Answer · 2023-03-10 15:30:42Z

I had the same problem recently on an Arduino Nano 33 IOT. I solved as follows:

Declare the instance of WiFiConnectionHandler as a global pointer, outside the setup function (not initialized! because, at this stage, we do not know the credentials of the WiFi network we want to connect to!)
Initialize the instance of the instance of WiFiConnectionHandler inside setup, only after having read the credentials from the EEPROM

In my case, it looks like this:

// declaration (outside setup)
WiFiConnectionHandler * iot_connector;

// setup function
void setup() {
 // read from EEPROM credentials of WiFi network to connect to
 // ssid = readFromEEPROM()
 // password = readFromEEPROM()
 
 // initialize the WiFiConnectionHandler pointer
 iot_connector = new WiFiConnectionHandler(ssid, password);
 ArduinoCloud.begin(*iot_connector);

 // setup OTA callback
 ArduinoCloud.onOTARequestCb(wifiOTARequestCallback);

 // setup debug info
 setDebugMessageLevel(DBG_VERBOSE);
 ArduinoCloud.printDebugInfo();
}

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