Compilation error when using WiFiClientSecure

[TuanAIoT]

I use CBU module with platformio.ini configuration [env:cbu] platform = libretiny board = cbu framework = arduino upload_speed = 921600 monitor_speed = 115200 lib_compat_mode = off lib_deps = 256dpi/MQTT@^2.5.1

Compile and Program operate normally and declare: WiFiClient WifiClient;

But got a compilation error when declaring: WiFiClientSecure WifiClientSecure;

Can someone help me fix it

[TuanAIoT]

I saw an article where the same error occurred with Esp32, but with the CBU module and libretiny platform, I don't know how to fix it. https://github.com/espressif/arduino-esp32/issues/5977

[kuba2k2]

The error from the linked issue is not related and completely different.

This issue has been found before and resolved, but it's in a different branch (not finished yet). For now, you can paste the following block of code into your program:

__attribute__((weak)) String ipToString(const IPAddress &ip) {
    char szRet[16];
    sprintf(szRet, "%hhu.%hhu.%hhu.%hhu", ip[0], ip[1], ip[2], ip[3]);
    return String(szRet);
}

Make sure to put it in a .cpp file, and not in a .c file.

[TuanAIoT]

What is that code and where should I paste it?

[kuba2k2]

This is the missing function. Paste it somewhere in your .cpp program file. For example after the line WiFiClientSecure WifiClientSecure. Also, it's better to name it something like clientSecure because your current name is too similar to the class name.

[TuanAIoT]

You mean paste it right after the line declaring WiFiClientSecure clientSecure; However, there is still a compilation error

[kuba2k2]

Yes, that's what I meant, However, the secure client is not tested and not properly implemented on Beken. You might want to use raw mbedTLS directly instead.

[TuanAIoT]

I did as you said and continued to comment line 241 and compiled successfully I wonder if my commenting line 241 will affect the MQTT SSL/TLS connection

I use attribute((weak)) right before declaring the command int mbedtls_net_set_nonblock( mbedtls_net_context *ctx ); It seems the compilation was successful but I don't know if the program works well

[kuba2k2]

You can't just comment out code - it's there for a reason. As I mentioned earlier, WifiClientSecure is not fully implemented and might not work at all, fail to compile, or even crash the chip.

[TuanAIoT]

You can't just comment out code - it's there for a reason. As I mentioned earlier, WifiClientSecure is not fully implemented and might not work at all, fail to compile, or even crash the chip.

So is there any way I can connect with MQTT SSL/TLS?

[kuba2k2]

Try using ESPHome instead. Maybe it supports MQTT with TLS.

[TuanAIoT]

I think I prefer programming on the libretiny platform. MQTT SSL/TLS connectivity is essential for IoT projects. Are you continuing to develop on this topic, because I think the MbedTLSClient library is quite complete, there's just a little more left. Everyone also hopes that your project can replace Tuya SDK. I don't like TuyaOS and the Tuya WindIDE compiler