Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
Thanks, step 5 "Set GDB client setup Executable to: ${openstm32_compiler_path}\arm-none-eabi-gdb.exe" saved my day, after wasting many hours searching for the solution. Finally i can debug with a J-link.