[BUG]WebSocketServer crash on ESP32-C6

[luc-github]

Hello Markus,
I hope you are ok - I am using your library (mainly WebSocketServer) on my project for years now, and it is working well on ESP8266, ESP8285, ESP32, ESP32-Pico,ESP32-S2, ESP32-S3, ESP32C3, great library.
Unfortunatly the WebSocketServer crash on ESP32-C6, I am just starting the porting.

I digged in the issue using your example: https://github.com/Links2004/arduinoWebSockets/blob/master/examples/esp32/WebSocketServer/WebSocketServer.ino
and found that line is the root cause on C6:
https://github.com/Links2004/arduinoWebSockets/blob/master/src/WebSocketsServer.cpp#L92

it seems ESP32-C6 really does not like :

#define DR_REG_RNG_BASE 0x3ff75144
    randomSeed(READ_PERI_REG(DR_REG_RNG_BASE));

replacing it by the default :

randomSeed(millis());

Solve the crash issue, I did not do a PR because I am not sure this is the solution you want, or you want to screen C6 only for it, etc...
So I just share my finding - hope it help

[Links2004]

makes sense the address is diffrent for the C6, but espressif has added a define for get the correct address:

https://github.com/espressif/esp-idf/blob/6673376297b921d438790d195014b860eaf8bb17/components/soc/esp32c6/include/soc/wdev_reg.h#L13

can you test:

#ifdef ESP8266
    randomSeed(RANDOM_REG32);
#elif defined(ESP32) && defined(WDEV_RND_REG)
    randomSeed(REG_READ(WDEV_RND_REG));
#elif defined(ESP32)
#define DR_REG_RNG_BASE 0x3ff75144
    randomSeed(READ_PERI_REG(DR_REG_RNG_BASE));
#elif defined(ARDUINO_ARCH_RP2040)
    randomSeed(rp2040.hwrand32());
#else
    // TODO find better seed
    randomSeed(millis());
#endif

this may require to add a include to soc/wdev_reg.h

[luc-github]

I have tested the changes with success on : ESP32 / ESP32-C3 / ESP32-C6 / ESP32-S2 / ESP32-S3
Using pioarduino 51.03.04 (platformio for esp32 arduino core 3.0.4 )
and for the header :

#if defined __has_include
#if __has_include("soc/wdev_reg.h")
#include "soc/wdev_reg.h"
#endif  // __has_include
#endif  // defined __has_include

and no issue so far ^_^, so looks good - thank you

[Links2004]

new release with change https://github.com/Links2004/arduinoWebSockets/releases/tag/2.6.1