+ Set the gdb server listen port. (default port: 4242)
+ -m, --multi
+ Set gdb server to extended mode.
+ st-util will continue listening for connections after disconnect.
+ -n, --no-reset
+ Do not reset board on connection.
+
+The STLINKv2 device to use can be specified in the environment
+variable STLINK_DEVICE on the format <USB_BUS>:<USB_ADDR>.