Watchdog triggered when loading a webpage form SPIFSS

Projects Programming
1

Hey guys!

I got this ESP32 that hosts its own little web server, I load the HTML/ CSS and images out of the ESP using SPIFFS. But I get a watchdog trigger (most of the time) because loading takes too long. I read that adding delay(1) to the function would help fix it. But it still triggers it.

The file is about 200kb and just takes a bit too long for the ESP to load.

wifiHandler hotspot;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("startup");
  if (SPIFFS.begin()) { 
		Serial.println("SPIFFS MOUNTED");
	}
  eeprom.init();
  eeprom.dumbData();

  server.on("/", HTTP_GET, hotspot.handleOnHome);
  server.on("/get", HTTP_GET, hotspot.handleGetData);
  server.onNotFound(hotspot.handleNotFound);
  server.on("/logo", HTTP_GET, hotspot.handleGetLogo);
  server.on("/background", HTTP_GET, hotspot.handleGetBackground);
  server.on("/style.css", HTTP_GET, hotspot.handleGetCSS);  
  server.begin();
}

void loop(){

}

wifiHandler.cpp

void wifiHandler::handleGetCSS(AsyncWebServerRequest *request){
    Serial.println("function: handleGetCSS");

    request->send(SPIFFS, "/style.css", "text/css");
    delay(1);
}

void wifiHandler::handleOnHome(AsyncWebServerRequest *request){
    Serial.println("function: handleOnHome");

   request->send(SPIFFS, "/ServerMain.html", String());
   delay(1);
}

void wifiHandler::handleGetData(AsyncWebServerRequest *request){
    Serial.println("function: handleGetDataAP");

    String dataFromWebserver[PARAMETERS_EEPROM];
    if (request->hasParam("ssidFromSetup")) {
        dataFromWebserver[0] = request->getParam("ssidFromSetup")->value();
    } 
    if (request->hasParam("passwordFromSetup")) {
        dataFromWebserver[1] = request->getParam("passwordFromSetup")->value();
    }
    if (request->hasParam("urlFromSetup")){
        dataFromWebserver[2] = request->getParam("urlFromSetup")->value();
    }

    Serial.printf("Data of the website: %s, %s, %s\r\n", dataFromWebserver[0].c_str(), dataFromWebserver[1].c_str(), dataFromWebserver[2].c_str());

    if (eeprom.saveData(dataFromWebserver, (sizeof(dataFromWebserver) / sizeof(dataFromWebserver[0])), true)){
        request->send(SPIFFS, "/ServerSucces.html", String());
        for (uint8_t i  = 0; i < PARAMETERS_EEPROM; i++){
        eeprom.getParameter(0, fromEeprom[0]);
        }
        broadcast = true;
    } else {
        Serial.println("Something went wrong"); 
        request->send(200, "text/plain", "something went wrong, please restart and retry");
    }
    delay(1);
}

void wifiHandler::handleNotFound(AsyncWebServerRequest *request){
    Serial.println("function: handleNotFound");
    // TODO Make a 404 page
    request->send(SPIFFS, "/ServerNotFound.html", String());
    delay(1);
}

void wifiHandler::handleGetLogo(AsyncWebServerRequest *request){
    Serial.println("function: handleGetLogo");

    request->send(SPIFFS, "/logo.png", "image/png");
    delay(1);
}
void wifiHandler::handleGetBackground(AsyncWebServerRequest *request){
    Serial.println("function: handleGetBackground");

    request->send(SPIFFS, "/background.jpg", "image/jpg");
    delay(1);
}

Serial monitor:

devices connected to AP, MAC: c0:3c:59:32:9e:07
Hotspot assigned IP: 192.168.1.3
function: handleOnHome
function: handleGetCSS
function: handleGetLogo
function: handleGetBackground
E (189149) task_wdt: Task watchdog got triggered. The following tasks did not reset the watchdog in time:
E (189149) task_wdt:  - async_tcp (CPU 0/1)
E (189149) task_wdt: Tasks currently running:
E (189149) task_wdt: CPU 0: IDLE0
E (189149) task_wdt: CPU 1: loopTask
E (189149) task_wdt: Aborting.
abort() was called at PC 0x40148a48 on core 0

ELF file SHA256: 0000000000000000

Backtrace: 0x400890ec:0x3ffbfa40 0x40089369:0x3ffbfa60 0x40148a48:0x3ffbfa80 0x40087055:0x3ffbfaa0 0x4017dd63:0x3ffbc250 0x4014a343:0x3ffbc270 0x4008bb39:0x3ffbc290 0x4008a37a:0x3ffbc2b0
  #0  0x400890ec:0x3ffbfa40 in invoke_abort at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp32/panic.c:715
  #1  0x40089369:0x3ffbfa60 in abort at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp32/panic.c:715
  #2  0x40148a48:0x3ffbfa80 in task_wdt_isr at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp32/task_wdt.c:252
  #3  0x40087055:0x3ffbfaa0 in _xt_lowint1 at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/xtensa_vectors.S:1154
  #4  0x4017dd63:0x3ffbc250 in esp_pm_impl_waiti at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp32/pm_esp32.c:492
  #5  0x4014a343:0x3ffbc270 in esp_vApplicationIdleHook at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp32/freertos_hooks.c:108
  #6  0x4008bb39:0x3ffbc290 in prvIdleTask at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/tasks.c:3507
  #7  0x4008a37a:0x3ffbc2b0 in vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c:355 (discriminator 1)

Rebooting...
ets Jun  8 2016 00:22:57
``
2

the doc states:

  • You can not use yield or delay or any function that uses them inside the callbacks

have you tried CSS compression tools? (eg CSS Minifier)

1 Like
3

Is it possible to break it up into smaller files and/or increase the watchdog time?

1 Like
4

Thanks for pointing that out, I removed the delay(1);

I just reduced the size of the image, the original file was 4K image of 330kb, and I reduced it to a 1080P image of just 90kb. That really helped with loading time.

5

Doesn't the ESP32 allow you to change the timeout of the watchdog? Is it as simple as increasing this time?

6

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