ESP32 panics when ArduinoWebsockets initiates a websocket connection about arduinowebsockets

[gilmaimon]

I believe I have a solution:
As you can see from the backtrace, the panic occurs inside WiFiClient which is part of the esp32's Arduino library. That means, the crash is not in my library exactly.
I've tried to reproduce this kind of crash, and I succeeded. All I had to do is to try and connect without a proper WiFi Connection setup on the device.
Please make sure that you have Wifi before calling connect! If you know connecting to a Wifi can time some time, you can try using this snippet:

for(int i = 0; i < NUM_SECONDS_TO_WAIT && WiFi.status() != WL_CONNECTED; i++) {
      Serial.print(".");
      delay(1000);
  }

I don't know how WifiManager works, but you would need to check that library's docs in order to understand how to do something once a connection is established (Using some sort of callback or blocking mechanism)

I am removing the bug tag, please let me know if you manage to fix this.

[lalten]

Interestingly, it works with wscat:

sudo wscat -l 80
listening on port 80 (press CTRL+C to quit)
client connected
< Hello
< 1243
< 1750
< 2257
< 2763
< 3268
< 3773
< 4278
< 4783
< 5289
< 5795

But even if ArduinoWebSockets can't properly connect, it should not panic the kernel.

Edit: s/should/should not/

[gilmaimon]

Thank you for the detailed issue. From a glance this seems to be like some bad error handling on my side.
I've labled this issue a bug and will try to re-produce and fix it in a few days.
Meanwhile, it will save me some time if you could:

• Make sure to are using the latest version of the library (0.4.1)
• Check if using an esp8266 with the same code and setup works

Thank you

[lalten]

Hi Gil,
lib version is current master.
platformio.ini:

[env:featheresp32]
platform = espressif32
board = featheresp32
framework = arduino

upload_speed = 921600
monitor_speed = 115200

lib_deps =  https://github.com/tzapu/WiFiManager.git#development
            https://github.com/gilmaimon/ArduinoWebsockets

With an ESP8266, same code:

[env:huzzah]
platform = espressif8266
board = huzzah
framework = arduino

upload_speed = 921600
monitor_speed = 115200

lib_deps =  https://github.com/tzapu/WiFiManager.git#development
            https://github.com/gilmaimon/ArduinoWebsockets

Output with sudo wscat -l 80:

*WM: [1] AutoConnect 
*WM: [2] Connecting as wifi client... 
*WM: [1] STA static IP:
*WM: [2] setSTAConfig static ip not set 
*WM: [3] WIFI station disconnect 
*WM: [1] Connecting to saved AP: XXXXXXXX
*WM: [3] Using Password: XXXXXXXX
*WM: [3] WiFi station enable 
*WM: [3] enableSTA PERSISTENT ON 
*WM: [1] connectTimeout not set, ESP waitForConnectResult... 
*WM: [2] Connection result: WL_CONNECTED
*WM: [3] lastconxresult: WL_CONNECTED
*WM: [1] AutoConnect: SUCCESS 
*WM: [1] STA IP Address: 192.168.1.92
Connnection Opened
Got a Pong!

Output with sudo websocat -s 80:

*WM: [1] AutoConnect 
*WM: [2] Connecting as wifi client... 
*WM: [1] STA static IP:
*WM: [2] setSTAConfig static ip not set 
*WM: [3] WIFI station disconnect 
*WM: [1] Connecting to saved AP: XXXXXXXX
*WM: [3] Using Password: XXXXXXXX
*WM: [3] WiFi station enable 
*WM: [3] enableSTA PERSISTENT ON 
*WM: [1] connectTimeout not set, ESP waitForConnectResult... 
*WM: [2] Connection result: WL_CONNECTED
*WM: [3] lastconxresult: WL_CONNECTED
*WM: [1] AutoConnect: SUCCESS 
*WM: [1] STA IP Address: 192.168.1.92

So no kernel panic (but it also doesn't connect)

[gilmaimon]

Thank you @lalten, I am on it.
Few things:

1. Try running the server using: sudo websocat -s 0.0.0.0:80 so it will be able to accept connections outside of localhost. Does it solves your problem?
2. Panic is surely not something that supposed, so this is considered a bug either way.

[gilmaimon]

@lalten please let me know if you solved the issue.

[elielmarcos]

Hey @gilmaimon we are with the same problem, when the server turn off the ws connection the esp32 enter in panic mode and we recieve this error:

Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC      : 0x400d4ea0  PS      : 0x00060d30  A0      : 0x800d4f74  A1      : 0x3ffdd8b0  
A2      : 0x00000000  A3      : 0x3ffdd8ff  A4      : 0x00000001  A5      : 0x00000001  
A6      : 0x3ffc27e8  A7      : 0x00000001  A8      : 0x00000000  A9      : 0x00000000  
A10     : 0x00000000  A11     : 0x00000000  A12     : 0x3ffddf14  A13     : 0x00000000  
A14     : 0x00000000  A15     : 0x00000001  SAR     : 0x0000000a  EXCCAUSE: 0x0000001c  
EXCVADDR: 0x00000008  LBEG    : 0x4000c2e0  LEND    : 0x4000c2f6  LCOUNT  : 0xffffffff  

Backtrace: 0x400d4ea0:0x3ffdd8b0 0x400d4f71:0x3ffdd8d0 0x4014c4a6:0x3ffdd8f0 0x400d84c7:0x3ffdd920 0x400d7d11:0x3ffdd940 0x400d1e21:0x3ffdda80 0x400885dd:0x3ffddac0

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:9232
load:0x40080400,len:6400
entry 0x400806a8

I'm using the 0.4.2 version now, and with the 0.4.0 i receieve the same error.

[gilmaimon]

Thank you very much, I'm on it. Expect a fixing patch today.

…

On Sat, Jun 1, 2019, 01:37 Eliel Romancini ***@***.***> wrote: Hey @gilmaimon <https://github.com/gilmaimon> we are with the same problem, when the server turn off the ws connection the esp32 enter in panic mode and we recieve this error: Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled. Core 1 register dump: PC : 0x400d4ea0 PS : 0x00060d30 A0 : 0x800d4f74 A1 : 0x3ffdd8b0 A2 : 0x00000000 A3 : 0x3ffdd8ff A4 : 0x00000001 A5 : 0x00000001 A6 : 0x3ffc27e8 A7 : 0x00000001 A8 : 0x00000000 A9 : 0x00000000 A10 : 0x00000000 A11 : 0x00000000 A12 : 0x3ffddf14 A13 : 0x00000000 A14 : 0x00000000 A15 : 0x00000001 SAR : 0x0000000a EXCCAUSE: 0x0000001c EXCVADDR: 0x00000008 LBEG : 0x4000c2e0 LEND : 0x4000c2f6 LCOUNT : 0xffffffff Backtrace: 0x400d4ea0:0x3ffdd8b0 0x400d4f71:0x3ffdd8d0 0x4014c4a6:0x3ffdd8f0 0x400d84c7:0x3ffdd920 0x400d7d11:0x3ffdd940 0x400d1e21:0x3ffdda80 0x400885dd:0x3ffddac0 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:9232 load:0x40080400,len:6400 entry 0x400806a8 I'm using the 0.4.2 version now, and with the 0.4.0 i receieve the same error. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#10?email_source=notifications&email_token=AEX4O6KEW2CIDA5ALLEO2E3PYGSA7A5CNFSM4HOFSGEKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODWWQ5JA#issuecomment-497880740>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEX4O6OMRLPZVMICJQQG67TPYGSA7ANCNFSM4HOFSGEA> .

[elielmarcos]

@gilmaimon , Thank you very much for your quick solution!

Exactly, it's the WiFiClient library that's causing all the problems. I have problems when I am connected to Wi-Fi, after turning off only the WS server the ESP32 is restarted.

My solution was: reinstall esp32 on Arduino with the older version 1.0.1

The newer version (1.0.3) probably updated something from the WiFi library that is causing the problem.

Thank you very much, I hope you find another solution !!!

[gilmaimon]

@gilmaimon , Thank you very much for your quick solution!

Exactly, it's the WiFiClient library that's causing all the problems. I have problems when I am connected to Wi-Fi, after turning off only the WS server the ESP32 is restarted.

My solution was: reinstall esp32 on Arduino with the older version 1.0.1

The newer version (1.0.3) probably updated something from the WiFi library that is causing the problem.

Thank you very much, I hope you find another solution !!!

Awesome, glad we pinned down the issue! By the way, give the library a star if you liked it. Hopefull that way more people will use and help improve it.

@lalten, please let me know if I can close the issue 👍

[gilmaimon]

I consider this as resolved.
Please open an issue or contact me for anything else.