Comments on: ESP32: Create a Wi-Fi Manager (AsyncWebServer library)

By: Dominik Ostrowski

Dominik Ostrowski — Mon, 23 Mar 2026 16:42:40 +0000

In reply to Sara Santos.

ESP Async WebServer 3.10.3 by ESP32Async

Threw an attempting to cast const pointer to non-const error

(Arduino IDE 2.3.8, MacOS 26.3.1 on MacBook M2)

By: Sara Santos

Sara Santos — Mon, 23 Mar 2026 16:27:18 +0000

In reply to Dominik Ostrowski.

Hi.
The code compiles just fine for me without any changes.
Which library versions are you using?
Regards,
Sara

By: Dominik Ostrowski

Dominik Ostrowski — Sun, 22 Mar 2026 11:26:46 +0000

In reply to Me-Chiel.

Great example!

One-line edit now needed to add const for compatibility with newer library:

266
AsyncWebParameter* p = request->getParam(i);
const AsyncWebParameter* p = request->getParam(i);

By: Sara Santos

Sara Santos — Sat, 08 Nov 2025 11:02:02 +0000

In reply to L’Arsène57.

Hi.
That’s probably related to be using the wrong libraries.
Please check my previous comment.
Then, let me know the results.

Regards,
Sara

By: Sara Santos

Sara Santos — Sat, 08 Nov 2025 11:00:47 +0000

In reply to L’Arsène57.

Hi.
Those are not the recommended libraries.
We recommend the ESPAsyncWebServer by ESP32Async, as well as the AsyncTCP by ESP32Async.
Delete those similar libraries and make sure to delete any folders related to those in your Arduino libraries folder.
Then, install the recommended libraries. They can be installed in the Arduino library manager. Please check the section in the tutorial “Installing Libraries (Arduino IDE)”.

After that, let me know if that fixed the issue.

Regards,
Sara

By: L'Arsène57

L'Arsène57 — Sat, 08 Nov 2025 08:59:57 +0000

Sara,
I also found these errors:
g:\Electronics and IT\Arduino\libraries\ESPAsyncWebServer\src\WebAuthentication.cpp: In function ‘bool getMD5(uint8_t*, uint16_t, char*)’:
g:\Electronics and IT\Arduino\libraries\ESPAsyncWebServer\src\WebAuthentication.cpp:74:3: error: ‘mbedtls_md5_starts_ret’ was not declared in this scope; did you mean ‘mbedtls_md5_starts’?
74 | mbedtls_md5_starts_ret(&_ctx);
| ^~~~~~~~~~~~~~~~~~~~~~
| mbedtls_md5_starts
g:\Electronics and IT\Arduino\libraries\ESPAsyncWebServer\src\WebAuthentication.cpp:75:3: error: ‘mbedtls_md5_update_ret’ was not declared in this scope; did you mean ‘mbedtls_md5_update’?
75 | mbedtls_md5_update_ret(&_ctx, data, len);
| ^~~~~~~~~~~~~~~~~~~~~~
| mbedtls_md5_update
g:\Electronics and IT\Arduino\libraries\ESPAsyncWebServer\src\WebAuthentication.cpp:76:3: error: ‘mbedtls_md5_finish_ret’ was not declared in this scope; did you mean ‘mbedtls_md5_finish’?
76 | mbedtls_md5_finish_ret(&_ctx, _buf);
| ^~~~~~~~~~~~~~~~~~~~~~
| mbedtls_md5_finish

Regards.
L’Arsène.

By: L'Arsène57

L'Arsène57 — Sat, 08 Nov 2025 08:50:03 +0000

235 / 5 000
Hello Sara,
The error message is:
exit status 1

Compilation error: exit status 1

The libraries are:
ESPAsyncWebServer.h by lacamera V 3.1.0
AsyncTCP.h by dvarrel V 1.1.4
LittleFS.h by ?

Regards, Arsène.

By: L'Arsène

L'Arsène — Fri, 07 Nov 2025 17:18:58 +0000

Hi Sara,
The error:
exit status 1
Compilation error: exit status 1

The libraries are:
ESPAsyncWebServer.h 3.1.0 lacamera
AsyncTCP.h 3.4.9
LittleFS.h
WiFi.h 1.2.7
Regards,
L’Arsène.

By: Sara Santos

Sara Santos — Fri, 07 Nov 2025 14:55:00 +0000

In reply to L’Arsène57.

Hi.
Can you provide more details about the error?
What are the exact libraries and versions you’re using?
Regards,
Sara

By: L'Arsène57

L'Arsène57 — Thu, 06 Nov 2025 16:18:09 +0000

Hi Sara,
When compiling the program, I get this error message on the monitor:

exit status 1

Compilation error: exit status 1
I read online that I need to modify a few lines in the AsyncWebSynchronization.h file.
Is this true, or how can I fix the problem?
These problems seem to have started after an update of either the IDE or the library!
Thanks in advance for your help.
Best regards,
L’Arsène.