Guru meditation panic using websockets

[frohro]

Hi Maddy,
I am having trouble with the ESP32 and ESP32-C3 (haven't tried any others) with websockets. Serial seems to work with serial, but a lot of my students are balancing things that would be much better without a tether cable. I have been trying to fix it this afternoon, but it is not fixing easily. I wonder if you have any advice. Here is the output.

ets Jun 8 2016 00:22:57␍␊
␍␊
rst:0x1 (POWERON_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:2␍␊
load:0x3fff0030,len:1184␍␊
load:0x40078000,len:13232␍␊
load:0x40080400,len:3028␍␊
entry 0x400805e4␍␊
[ 3][V][WiFiServer.h:42] WiFiServer(): WiFiServer::WiFiServer(port=80, ...)␍␊
[ 10][V][WiFiServer.h:42] WiFiServer(): WiFiServer::WiFiServer(port=80, ...)␍␊
[ 24][D][esp32-hal-cpu.c:244] setCpuFrequencyMhz(): PLL: 480 / 2 = 240 Mhz, APB: 80000000 Hz␍␊
[ 66][V][esp32-hal-uart.c:330] uartBegin(): UART0 baud(115200) Mode(800001c) rxPin(3) txPin(1)␍␊
[ 76][V][esp32-hal-uart.c:416] uartBegin(): UART0 not installed. Starting installation␍␊
[ 87][V][esp32-hal-uart.c:467] uartBegin(): UART0 initialization done.␍␊
␊
␊
Starting ESP32 WiFi PlotExample␍␊
Connecting to WiFi through CommManager...␍␊
Connecting to Frohne-2.4GHz WiFi [ 1127][D][WiFiGeneric.cpp:1040] _eventCallback(): Arduino Event: 0 - WIFI_READY␍␊
[ 1214][V][WiFiGeneric.cpp:97] set_esp_interface_ip(): Configuring Station static IP: 0.0.0.0, MASK: 0.0.0.0, GW: 0.0.0.0␍␊
[ 1212][V][WiFiGeneric.cpp:341] _arduino_event_cb(): STA Started␍␊
[ 1231][D][WiFiGeneric.cpp:1040] _eventCallback(): Arduino Event: 2 - STA_START␍␊
.[ 1331][V][WiFiGeneric.cpp:356] _arduino_event_cb(): STA Connected: SSID: Frohne-2.4GHz, BSSID: 14:91:82:60:9d:c6, Channel: 11, Auth: OPEN␍␊
[ 1344][D][WiFiGeneric.cpp:1040] _eventCallback(): Arduino Event: 4 - STA_CONNECTED␍␊
[ 1368][V][WiFiGeneric.cpp:370] _arduino_event_cb(): STA Got New IP:192.168.1.5␍␊
[ 1376][D][WiFiGeneric.cpp:1040] _eventCallback(): Arduino Event: 7 - STA_GOT_IP␍␊
[ 1383][D][WiFiGeneric.cpp:1103] _eventCallback(): STA IP: 192.168.1.5, MASK: 255.255.255.0, GW: 192.168.1.1␍␊
connected!␍␊
--> 192.168.1.5:80 <--␊
Guru Meditation Error: Core 1 panic'ed (InstrFetchProhibited). Exception was unhandled.␍␊
␍␊
Core 1 register dump:␍␊
PC : 0x00060823 PS : 0x00060130 A0 : 0x800d2d20 A1 : 0x3ffb21d0 ␍␊
A2 : 0x00060823 A3 : 0xcab045da A4 : 0xcab045da A5 : 0x3ffb218c ␍␊
A6 : 0x3ffc61c0 A7 : 0x3ffb218c A8 : 0x800d7a76 A9 : 0x3ffb21b0 ␍␊
A10 : 0x3ffb7d90 A11 : 0x00000000 A12 : 0x00000000 A13 : 0x00000000 ␍␊
A14 : 0x3ffcf578 A15 : 0x00000000 SAR : 0x00000020 EXCCAUSE: 0x00000014 ␍␊
EXCVADDR: 0x00060820 LBEG : 0x400d6d20 LEND : 0x400d6d32 LCOUNT : 0x00000000 ␍␊
␍␊
␍␊
Backtrace: 0x00060820:0x3ffb21d0 0x400d2d1d:0x3ffb21f0 0x400d2bf9:0x3ffb2240 0x400db072:0x3ffb2290␍␊
␍␊
␍␊
␍␊
␍␊
ELF file SHA256: d0f8999387fba1aa␍␊
␍␊
Rebooting...␍␊

As you can see, it happens just after the cm.connect connects to WiFi. I have been using the ESP32 dev kit for this, because it is better tested than the ESP32-C3 in general. My code is in the guru-meditition branch of this repo on github. https://github.com/frohro/WWU6302view.git
If you have any good ideas, I would be grateful!
Rob

[almonds0166]

Hm... did you uncomment #define S302_WEBSOCKETS in Six302.h? Asking because it doesn't look like it in the branch you shared

I can test it tomorrow morning on my hardware

[frohro]

Yes, I did that. I found it better to comment both ways out and change it with a -DSix302_WEBSOCKETS, but yes, that was the first thing. 🙂 I'll be interested to see if your superior programming skills will be the ticket. 🙂 Thanks, Rob

…

-- Rob Frohne, PhD PE School of Engineering Walla Walla University 100 SW 4th St College Place, WA 99324 (509) 527-2075

________________________________ From: almonds0166 ***@***.***> Sent: Friday, May 16, 2025 6:26 PM To: almonds0166/6302view ***@***.***> Cc: Rob Frohne ***@***.***>; Author ***@***.***> Subject: Re: [almonds0166/6302view] Guru meditation panic using websockets (Issue #7) CAUTION: This email originated from outside the Walla Walla University email system. [https://avatars.githubusercontent.com/u/42977337?s=20&v=4]almonds0166 left a comment (almonds0166/6302view#7)<#7 (comment)> Hm... did you uncomment #define S302_WEBSOCKETS in Six302.h? Asking because it doesn't look like it in the branch you shared I can test it tomorrow morning on my hardware — Reply to this email directly, view it on GitHub<#7 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AAHS2BNSL7NV3XUN6PJ7C7D262F4LAVCNFSM6AAAAAB5J5RYH6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQOBXHEZTINRWG4>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[almonds0166]

I confirmed it crashes after connecting on my little C3, and I figured out it's due to the WebSockets library, which has had some updates over the months. 6302view works until WebSockets version 2.4.1 (June 2024) it seems.

Version 2.4.0 is the latest for which it does not crash for me, if you need a quick fix. I will look into what can be done on the 6302view side of things.

Careful using so much Claude generated code 😅 it looks like it doesn't know what the CommManager parameters mean, delays are not necessary when using cm.step(), and I'm not sure what the modifications to the .cpp are trying to accomplish.

[almonds0166]

Note for future self: crashes at this WiFiServer*->begin line within WebSocketsServer.begin, never reaching WebSocketsServer.onEvent.

[frohro]

Thanks Maddy! I'll just use websockets 2.4.0. That is a fine solution for me at the moment. And yes, after the coding was above my level of expertise, I went to Claude. I'm trying to learn how to use it in a good way. It has been helpful for me, but you need to learn how to use it properly, which takes time. I did learn a few things from the AI, and as you noticed, I found it confusing your CommManager with someone else's it knew about already. The reason the Six302.cpp and .h were in the src directory is that GitHub Copilot can read the code in src . I started to put Websockets in src too, but it was too big and I quickly abandoned that plan. I should have done as you did and tried some old Websocket libraries. I won't be using the modified code here. The only modifications I did were to put const in front of char in the call to CommManager::connect(const char*, const char*) and not defining either S302_WEBSOCKETS or S302_SERIAL in the Six302.h, but instead defining them in the platformio.ini. That way, I don't have to modify your library, only how I build it.
Again, thanks so much for the help!!
Rob