Resolved! SWD multidrop? Does any STM32 or ST-LINK support it?
Found this feature mentioned in Segger J-LINK wiki, but it is not clear which targets support it:https://developer.arm.com/documentation/ddi0314/h/Debug-Access-Port/SW-DP/SW-DP-multi-drop-support?lang=enIt looks like a cheap alternative of JTAG cha...