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.
I manage to get things working when using a ST stlink USB dongle or a discovery board.
No success when using a nucleo (STM32L152RE). Have to check the nucleo L4.