ESP32 Forum

Posted: **Thu Nov 17, 2022 5:08 am**

I am relatively new to ESP32 and network programming.

I am running an ESP32S3 chip. I want to be able to scan all packets coming in and then connect to an access point to send a report to a url and then resume scanning.

It is pretty much working but I get this error when going to the access point.

E (762367) esp_netif_lwip: esp_netif_new: Failed to configure netif with config=0x3fce53b4 (config or if_key is NULL or duplicate key)

Below is the code in setup() to initialize the scan.

Code: [Select all] [Expand/Collapse]

nvs_flash_init();
  tcpip_adapter_init();
 
  esp_event_loop_init(event_handler, NULL);
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
 
  esp_wifi_init(&cfg);
  esp_wifi_set_storage(WIFI_STORAGE_RAM);
  esp_wifi_set_mode(WIFI_MODE_NULL);
  esp_wifi_start();
  esp_wifi_set_promiscuous(true);
  esp_wifi_set_promiscuous_rx_cb(&callback);
 
  esp_wifi_set_channel(6, WIFI_SECOND_CHAN_NONE);
 

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Everything is working fine. No errors and I am getting the packets.

Now I want to connect to an access point and this is the code I run.

Code: [Select all] [Expand/Collapse]

 printf("Stopping Scanning \r\n");
  esp_err_t errorNumber;
  errorNumber = esp_wifi_stop();
  printf("errorNumber: %x \r\n", (int) errorNumber);
  errorNumber = esp_wifi_disconnect();
  printf("errorNumber: %x \r\n", (int) errorNumber); // Getting error 0x3002
  errorNumber = esp_wifi_deinit();
  printf("errorNumber: %x \r\n", (int) errorNumber);
  esp_netif_init();
  esp_wifi_restore();
  delay(5000);

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I do get error 0x3002 when I call esp_wifi_disconnect(). ESP_ERR_WIFI_NOT_STARTED (0x3002): WiFi driver was not started by esp_wifi_start so maybe I need to call something else to stop the driver. Not sure what to call to do this.

I put the delay in just to give things time.

I now connect to the network with this code

Code: [Select all] [Expand/Collapse]

wifiMulti.addAP("NetworkIWantToConnectTo", "password");
delay(5000);
httpUrl = "www.whereIwantToGoTo.com";

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So far so good.

Now in the loop() code I have

Code: [Select all] [Expand/Collapse]

if (strlen(httpUrl) > 0)
  {
    int rc = wifiMulti.run(); // This is the line where I am getting the error
    if ((rc == WL_CONNECTED)) {
      printf("wifiMulti is connected \r\n");
 
      HTTPClient http;
      Serial.print("[HTTP] begin...\n");
      // configure traged server and url
      
      printf("Going out to %s \r\n", httpUrl);
      http.begin(httpUrl);
      Serial.print("[HTTP] GET...\n");
      // start connection and send HTTP header
      int httpCode = http.GET();
 
      // httpCode will be negative on error
 
      if (httpCode > 0) {
        // HTTP header has been send and Server response header has been handled
        Serial.printf("[HTTP] GET... code: %d\n", httpCode);
      } else {
        Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
      }
      httpDataReceived = true;
 
      strcpy(httpUrl, "");
 
      http.end();
      stopHttpNetwork();
      //delay(5000);
      initializeScanning();
    }

The code does appear to work as I am going out to the Internet and getting the web page. However, the error is concerning and sometimes it appears the chip does get confused and I have to call stopHttpNetwork() several times as well as initializeScanning()

Code: [Select all] [Expand/Collapse]

void stopHttpNetwork()
{
  esp_wifi_disconnect();
  delay(5000);
  printf("Just disconnected from Internet\r\n");
  return;
}
void initializeScanning()
{
  printf("Initializing Remote ID Scanning \r\n");
  wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
 
  esp_wifi_init(&cfg);
  esp_wifi_set_storage(WIFI_STORAGE_RAM);
  esp_wifi_set_mode(WIFI_MODE_NULL);
  esp_wifi_start();
  esp_wifi_set_promiscuous(true);
  esp_wifi_set_promiscuous_rx_cb(&callback);
 
  esp_wifi_set_channel(6, WIFI_SECOND_CHAN_NONE);
 
  return;
}

I assume I should be doing something else when I shut down the scanning to free up some memory or resources but I don't know what to call to do it.

Any help would be greatly appreciated.

Thanks

ESP32 Forum

Getting this error "E (762367) esp_netif_lwip: esp_netif_new: Failed to configure netif with config=0x3fce53b4 (config o

Getting this error "E (762367) esp_netif_lwip: esp_netif_new: Failed to configure netif with config=0x3fce53b4 (config o