How to build the SDK with libwebsockets

Technical Support
, , ,
1

I used Yocto to build an SDK with libwebsockets. However, even if I declare #include <libwebsockets.h>, I cannot use the APIs in libwebsockets.c. Is the SDK not built properly?(Use BSP6.8 Minimal Image)
*The following has been added to local.conf.

IMAGE_INSTALL:append = " libwebsockets"
TOOLCHAIN_TARGET_TASK:append = " libwebsockets"
SDKIMAGE_FEATURES:append = " libwebsockets"

2

Hi, I’m the Toradex AI Assistant. The Toradex Support team will follow up with you shortly!

Did you like my answer?

:+1: :-1:

Hello!

To ensure that the libwebsockets library is correctly included in your SDK and that you can use its APIs, please follow these steps:

  1. Verify Yocto Configuration:

    • Double-check your local.conf file to ensure it includes the correct entries:
      IMAGE_INSTALL:append = " libwebsockets"
TOOLCHAIN_TARGET_TASK:append = " libwebsockets"
SDKIMAGE_FEATURES:append = " libwebsockets"
    • Look out for any typos or syntax errors in these lines.

  2. Rebuild the SDK:

    • Once you’ve confirmed the configuration, rebuild the SDK with the command:
      bitbake <your-image-name> -c populate_sdk
    • This will regenerate the SDK with the specified packages.

  3. Install the SDK:

    • After building, install the SDK by running the generated script found in oe-core/deploy/sdk/.
    • Source the environment setup script provided by the SDK to set up the cross-compilation environment.

  4. Check for libwebsockets in the SDK:

    • Verify that the libwebsockets headers and libraries are present in the SDK’s sysroot. Check the include directory for libwebsockets.h and the lib directory for the corresponding library files.

  5. Compile Your Application:

    • Ensure your application’s build system (e.g., Makefile, CMake) is configured to include the libwebsockets headers and link against its libraries. This typically involves adding -I and -L flags to the compiler and linker commands, respectively.
    • For example, you might need to add:
      -I<path-to-sdk>/sysroots/<target>/usr/include
-L<path-to-sdk>/sysroots/<target>/usr/lib -lwebsockets

  6. Troubleshoot Compilation Issues:

    • If issues persist, check the compiler and linker output for any missing paths or unresolved symbols related to libwebsockets.
    • Ensure that the environment variables set by the SDK’s environment script are correctly applied in your build process.

By following these steps, you should be able to confirm whether libwebsockets is properly included in your SDK and resolve any issues with using its APIs in your application.

Best regards,
Toradex AI Assistant.

Please, also check if these links can help you solve your problem:

How to use Libwebsocket.

3

It seems that the library has been properly added to the SDK.
What I was lacking was not an understanding of Yocto, but an understanding of Eclipse.