HTTPClient Guru Meditation Error: Core 0 panic'ed (Unhandled debug exception) in POST method

[mourazo]

Hardware:

Board	ESP32 nodeMCU
IDE name	Arduino IDE
Flash Frequency	80Mhz
PSRAM enabled	no
Upload Speed	115200
Computer OS	Windows 10

Description:

I try to send post data with the library HTTPClient, but after send somes packets, I have the next exception:

Guru Meditation Error: Core 1 panic'ed (Unhandled debug exception)
Debug exception reason: Stack canary watchpoint triggered (BeginWIFITask)
Core 1 register dump:
PC : 0x4008c30c PS : 0x00060a36 A0 : 0x40081fac A1 : 0x3ffbab40
A2 : 0x3ffbaff0 A3 : 0x00000003 A4 : 0x00000004 A5 : 0x3ffbafe0
A6 : 0x3ffbac10 A7 : 0x00000014 A8 : 0x00000009 A9 : 0x0000005a
A10 : 0x00000024 A11 : 0x0000002a A12 : 0xffffffff A13 : 0x3f42bff0
A14 : 0x3ffbac10 A15 : 0x3ffbae34 SAR : 0x00000004 EXCCAUSE: 0x00000001
EXCVADDR: 0x00000000 LBEG : 0x400014fd LEND : 0x4000150d LCOUNT : 0xfffffffa

ELF file SHA256: 0000000000000000

Backtrace: 0x4008c30c:0x3ffbab40 0x40081fa9:0x3ffbaf10 0x40114346:0x3ffbafa0 0x400fae0e:0x3ffbafe0 0x400f6ee5:0x3ffbb040 0x400f759b:0x3ffbb0f0 0x400f7727:0x3ffbb150 0x400f774b:0x3ffbb170 0x400d2c02:0x3ffbb190 0x4008966a:0x3ffbb2d0

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

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1100
load:0x40078000,len:10900
load:0x40080400,len:6388
entry 0x400806b4

I decode the exception with ESP Exception decoder and this is the result:

PC: 0x4008c30c
EXCVADDR: 0x00000000

Decoding stack results
0x40114346: vsnprintf at ../../../.././newlib/libc/stdio/vsnprintf.c line 41
0x400fae0e: log_printf at C:\Users\alvar\Documents\Arduino\hardware\espressif\esp32\cores\esp32\esp32-hal-uart.c line 533
0x400f6ee5: HTTPClient::handleHeaderResponse() at C:\Users\alvar\Documents\Arduino\hardware\espressif\esp32\libraries\HTTPClient\src\HTTPClient.cpp line 1240
0x400f759b: HTTPClient::sendRequest(char const*, unsigned char*, unsigned int) at C:\Users\alvar\Documents\Arduino\hardware\espressif\esp32\libraries\HTTPClient\src\HTTPClient.cpp line 585
0x400f7727: HTTPClient::POST(unsigned char*, unsigned int) at C:\Users\alvar\Documents\Arduino\hardware\espressif\esp32\libraries\HTTPClient\src\HTTPClient.cpp line 493
0x400f774b: HTTPClient::POST(String) at C:\Users\alvar\Documents\Arduino\hardware\espressif\esp32\libraries\HTTPClient\src\HTTPClient.cpp line 498
0x400d2c02: beginWIFITask(void*) at C:\Users\alvar\Documents\Arduino\CO2_Interfaz_WifiH/tasks.ino line 92
0x4008966a: vPortTaskWrapper at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/freertos/port.c line 143

Sketch: (leave the backquotes for code formatting)

The sketch it's too long because I use a display with LVGL library but the exception it's in this part of code only when I use the HttpClient for send the data

void beginWIFITask(void *pvParameters) {


  updateBottomStatus(LV_COLOR_TEAL,"Conectando WIFI: " + ssidName);

  unsigned long startingTime = millis();

  WiFi.begin(ssidName.c_str(), password.c_str());
  while (WiFi.status() != WL_CONNECTED && (millis() - startingTime) < timeout)
  {
    vTaskDelay(250);
  }

   if(WiFi.status() != WL_CONNECTED) {
    updateBottomStatus(LV_COLOR_RED, "Revisa la contraseña y vuelve a intentarlo otra vez");
    vTaskDelay(2500);
    networkScanner();
    vTaskDelete(NULL);
  }

 
  updateBottomStatus(LV_COLOR_GREEN, "CONECTADO CORRECTAMENTE, IP: " +  WiFi.localIP().toString());
 
  while(1){
    if(WiFi.status() == WL_CONNECTED){
     
     delay(100);

     HTTPClient http;

       http.begin(serverName);
        

       // Specify content-type header
       http.addHeader("Content-Type", "application/x-www-form-urlencoded");
       String co2S = String(co2m);
       String tempS = String(temp);
       String humS = String(hum);       
       String httpRequestData = "key=47562jtugj7234785&co2=" + co2S+ "&temp="+ tempS +"&hum=" +humS;
       
       int httpResponseCode = http.POST(httpRequestData);
       
      if (httpResponseCode>0) {
        Serial.print("HTTP Response code: ");
        Serial.println(httpResponseCode);
      }
      
      http.end();
 
 
      updateBottomStatus(LV_COLOR_BLUE, "::Datos enviados correctamentes a Sequosentry::");


    delay(30000);
    updateBottomStatus(LV_COLOR_GREEN, "::Conectando con Sequosentry::");
    }else{
      
                WiFi.begin(ssidName.c_str(), password.c_str());
                while (WiFi.status() != WL_CONNECTED && (millis() - startingTime) < timeout)
                {
                  vTaskDelay(250);
                }
              
                 if(WiFi.status() != WL_CONNECTED) {
                  updateBottomStatus(LV_COLOR_RED, "Revisa la contraseña y vuelve a intentarlo otra vez");
                  vTaskDelay(2500);
                  networkScanner();
                  vTaskDelete(NULL);
                }
      
    }
  }
    updateBottomStatus(LV_COLOR_RED, "::Se perdio la conexion con la red WIFI::");
    delay(10000);
    networkScanner();
    vTaskDelete(NULL);
}

The line 92 of

0x400d2c02: beginWIFITask(void*) at C:\Users\alvar\Documents\Arduino\CO2_Interfaz_WifiH/tasks.ino line 92

its exactly the next line :

int httpResponseCode = http.POST(httpRequestData);

Thanks for all