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.
openocd can not open your stlink adapter, see:
Debug: 251 7 stlink_usb.c:1714 stlink_usb_open(): transport: 1 vid: 0x0483 pid: 0x3748 serial:
Error: 252 46 stlink_usb.c:1727 stlink_usb_open(): open failed
check if your pid/vid is ok refferring to stlink v1 vs v2