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Arduino core for the ESP32
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Using WiFi.softAPConfig() when device connects to the AP generate exception #3906

Closed LusterWong closed 3 years ago

LusterWong commented 4 years ago

Hardware:

Board: ESP32 Core Installation version: 1.0.3 IDE name: Arduino IDE/Eclipse Flash Frequency: 40Mhz PSRAM enabled: no Upload Speed: 115200 Computer OS: Windows 7

Description:

The program just enabled softAP and set the IP address, gateway, mask, everything started normally, the serial port output "IDLE."

When the device(PC or mobile) is connected, the serial port outputs: dhcps: send_offer >> udp_sendto result 0 And it prompts Guru Meditation Error: Core 0 panic'ed (InstrFetchProhibited). Exception was unhandled.

It is not clear how to solve it, I will only use simple arduino without in-depth understanding of the core of idf, what is the problem? How to solve?

Thanks.

Sketch: (leave the backquotes for code formatting)


#include <Arduino.h>
#include <WiFi.h>

const char *SSID = "FreeWifi";
const char *Password = "12345678";

void setup()
{
    Serial.begin(115200);
    delay(5000);

    IPAddress localIP(192,168,1,1);
    IPAddress gateway(192,168,1,0);
    IPAddress subnet(255,255,255,0);

    WiFi.softAPConfig(localIP, gateway, subnet);
    WiFi.softAP(SSID, Password);
    Serial.println(WiFi.softAPIP());

}

void loop()
{
    delay(2000);
    Serial.println("IDLE.");
}

Debug Messages:

192.168.1.1
IDLE.
IDLE.
IDLE.
dhcps: send_offer>>udp_sendto result 0
IDLE.
IDLE.
dhcps: send_offer>>udp_sendto result 0
Guru Meditation Error: Core  0 panic'ed (InstrFetchProhibited). Exception was unhandled.
Core 0 register dump:
PC      : 0x00000000  PS      : 0x00060e30  A0      : 0x80111af9  A1      : 0x3ffb3d30  
A2      : 0x3ffcbcf8  A3      : 0x3ffcbf2c  A4      : 0x3ffcbb38  A5      : 0x3ffcbba0  
A6      : 0x0201a8c0  A7      : 0x0c01a8c0  A8      : 0x8011199c  A9      : 0x3ffb3cf0  
A10     : 0x3ffcbd08  A11     : 0x3ffcbf2c  A12     : 0x3ffb3d3c  A13     : 0x00000044  
A14     : 0x00000001  A15     : 0x00000006  SAR     : 0x00000010  EXCCAUSE: 0x00000014  
EXCVADDR: 0x00000000  LBEG    : 0x4000c349  LEND    : 0x4000c36b  LCOUNT  : 0x00000000  

Backtrace: 0x00000000:0x3ffb3d30 0x40111af6:0x3ffb3d70 0x4011c181:0x3ffb3d90 0x40121189:0x3ffb3dd0 0x401262ae:0x3ffb3df0 0x401121fb:0x3ffb3e10 0x4008aff9:0x3ffb3e40

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

rst:0xc (SW_CPU_RESET),boot:0x1e (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:1044
load:0x40078000,len:8896
load:0x40080400,len:5816
entry 0x400806ac

Exception Decoder

PC: 0x00000000
EXCVADDR: 0x00000000

Decoding stack results
0x40111af6: handle_dhcp at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/lwip/apps/dhcpserver/dhcpserver.c line 1031
0x4011c181: udp_input at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/lwip/lwip/src/core/udp.c line 401
0x40121189: ip4_input at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/lwip/lwip/src/core/ipv4/ip4.c line 740
0x401262ae: ethernet_input at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/lwip/lwip/src/netif/ethernet.c line 184
0x401121fb: tcpip_thread at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/lwip/lwip/src/api/tcpip.c line 135
0x4008aff9: vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c line 143
LusterWong commented 4 years ago

I have tried not to use WiFi.softAPConfig (localIP, gateway, subnet), everything will be normal, the device can connect to softAP and have normal IP allocation

lbernstone commented 4 years ago

Are you sure your gateway is at 192.168.1.0? This is not usually possible on consumer grade equipment.

robacarp commented 4 years ago

I'm able to confirm this crash with this snippet (192.168.1.1). I notice that the crash doesn't happen the first time a device is connected to an ssid, but the second. Changing the ssid gets a one shot successful connect -- probably the dhcp lease is attempting to be renewed rather than requested.

#include <WiFi.h>
#include <WebServer.h>
#include <DNSServer.h>

IPAddress ip(192, 168, 1, 1);

void setup() {
  delay(3000);

  WiFi.disconnect();
  WiFi.mode(WIFI_OFF);

  WiFi.mode(WIFI_AP);
  WiFi.softAPConfig(ip, ip, IPAddress(255, 255, 255, 0));
  WiFi.softAP("test");
}

void loop() { }
LusterWong commented 4 years ago

Are you sure your gateway is at 192.168.1.0? This is not usually possible on consumer grade equipment.

Tried replacing with： IPAddress localIP(192,168,1,23); IPAddress gateway(192,168,1,1); IPAddress subnet(255,255,255,0);

No abnormality occurs, but the serial port prompts: dhcps: send_offer>>udp_sendto result 0 Guru Meditation Error: Core 0 panic'ed (InstrFetchProhibited) at pc=00000000. Setting bp and returning..

Then stuck, no ‘IDLE’ output

LusterWong commented 4 years ago

I'm able to confirm this crash with this snippet (192.168.1.1). I notice that the crash doesn't happen the first time a device is connected to an ssid, but the second. Changing the ssid gets a one shot successful connect -- probably the dhcp lease is attempting to be renewed rather than requested.

#include <WiFi.h>
#include <WebServer.h>
#include <DNSServer.h>

IPAddress ip(192, 168, 1, 1);

void setup() {
  delay(3000);

  WiFi.disconnect();
  WiFi.mode(WIFI_OFF);

  WiFi.mode(WIFI_AP);
  WiFi.softAPConfig(ip, ip, IPAddress(255, 255, 255, 0));
  WiFi.softAP("test");
}

void loop() { }

This is a very normal usage, I hope the official can help parse

me-no-dev commented 4 years ago

this is an issue in the underlying IDF libraries. All I can offer is to try the 4.0 branch or esp32s2 branch, which tracks IDF master.

LusterWong commented 4 years ago

this is an issue in the underlying IDF libraries. All I can offer is to try the 4.0 branch or esp32s2 branch, which tracks IDF master.

Thanks. I do n’t understand IDF, so I use arduion framework. I remember that I tried this last year and it didn't have this problem. At that time, IDF was still v3.xx version. Later, it was suspended because of my work, and I recently reopened the ESP32 test.

immakermatty commented 4 years ago

Weird... From my experience, the crash doesn't happen when the DCORE_DEBUG_LEVEL is set to level 5. But does when it is set to level 0 or 1.

LusterWong commented 4 years ago

DCORE_DEBUG_LEVEL

How to change DCORE_DEBUG_LEVEL with eclipse ?

mshoe007 commented 4 years ago

This is the same as

https://github.com/espressif/arduino-esp32/issues/2025

ESP8266 has similar https://github.com/homieiot/homie-esp8266/issues/588 https://github.com/homieiot/homie-esp8266/issues/637

The 'fix' for me is a two second delay between WiFi.mode(WIFI_AP) and WiFi.softAPConfig() as described in 2025

LusterWong commented 4 years ago

It's a little strange to do that. How did you find out?

Thank you very much. I'll try it

mshoe007 notifications@github.com 于2020年7月6日周一 上午2:18写道：

This is the same as

2025 https://github.com/espressif/arduino-esp32/issues/2025

ESP8266 has similar homieiot/homie-esp8266#588 https://github.com/homieiot/homie-esp8266/issues/588 homieiot/homie-esp8266#637 https://github.com/homieiot/homie-esp8266/issues/637

The 'fix' for me is a two second delay between WiFi.mode(WIFI_AP) and WiFi.softAPConfig() as described in 2025

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petrbrouzda commented 4 years ago

I'm able to confirm this crash with this snippet (192.168.1.1). I notice that the crash doesn't happen the first time a device is connected to an ssid, but the second. Changing the ssid gets a one shot successful connect -- probably the dhcp lease is attempting to be renewed rather than requested.

@robacarp , it seems like you are right! Reconnecting to previously used SoftAP name -> ESP restart. So I've added random suffix to SoftAP's name and the problem gone.

stale[bot] commented 4 years ago

[STALE_SET] This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.

stale[bot] commented 3 years ago

[STALE_DEL] This stale issue has been automatically closed. Thank you for your contributions.

ScaredyCat commented 3 years ago

Why has this been closed. It's still an issue. Please reopen

dswilkinson73 commented 3 years ago

This is still an issue, I read a comment that putting the "Core Debug Level" to 5 solves the problem. It worked for me but should be still be fixed. I prefer run at level 0.

mlord commented 2 years ago

The solution is a 100ms (or greater) delay after WiFi.softAP() before WiFi.softAPConfig() is invoked. The reason is that the WiFi stack isn't ready for WiFi.softAPConfig() until SYSTEM_EVENT_AP_START has been delivered. One could write more complex code to wait for SYSTEM_EVENT_AP_START, or instead just go with the 100msec delay: delay(100);

3tawi commented 2 years ago

include

include

const char* Apssid = "Esp32";

const char* Appassword = "3tawi-GP"; IPAddress ip(192, 168, 1, 141); IPAddress gateway(192, 168, 1, 1); IPAddress subnet(255, 255, 255, 0);

void setup() { Serial.begin(115200); WiFi.softAPConfig(ip, gateway, subnet); WiFi.softAP(Apssid, Appassword); delay(3000); String textip = " IP Address: http://"; textip += WiFi.softAPIP().toString().c_str(); Serial.println(""); Serial.print(textip); }

void loop() { }

3tawi commented 2 years ago

result : IP Address: http://192.168.1.141

ScaredyCat commented 2 years ago

In setup:

    WiFi.onEvent(WiFiEvent);

Then this gets called on an event. Make whatever calls you need from the relevant event

void WiFiEvent(WiFiEvent_t event){

    switch(event) {

        case SYSTEM_EVENT_AP_START:                           
            break;

         case SYSTEM_EVENT_STA_START:
            break;

        case SYSTEM_EVENT_STA_CONNECTED:
            break;

        case SYSTEM_EVENT_AP_STA_GOT_IP6:
            break;

        case SYSTEM_EVENT_STA_GOT_IP:
            break;

        case SYSTEM_EVENT_STA_DISCONNECTED:
            break;

        default:
            break;
   }
}
Himanshu21358 commented 1 year ago

Sir I am new developer now we are create a ESP8266 as server and serial port receive data and send data successfully. but I have a issue now I am change my Wi-Fi SOFTAP credentials(like SSID, PASWORD) by receive in serial monitor, so please suggest any code ?