root@STM32exp:/sys/devices/platform/vhci_hcd.0# /usr/local/bin/usbip --debug --tcp-port 2001 attach -r localhost -b 2-1
usbip: debug: usbip_network.c:28:[usbip_setup_port_number] parsing port arg '2001'
usbip: info: using port 2001 ("2001")
usbip: debug: usbip.c:129:[run_command] running command: `attach'
libusbip: debug: vhci_driver.c:269:[usbip_vhci_driver_open] available ports: 16
libusbip: debug: vhci_driver.c:281:[usbip_vhci_driver_open] available controllers: 1
libusbip: debug: vhci_driver.c:128:[refresh_imported_device_list] controller 0
libusbip: debug: vhci_driver.c:67:[parse_status] hub hs port 0 status 4 speed 0 devid 0
libusbip: debug: vhci_driver.c:69:[parse_status] sockfd 0 lbusid 0-0
[...]
libusbip: debug: vhci_driver.c:104:[parse_status] exit
usbip: debug: usbip_attach.c:100:[import_device] got free port 0
libusbip: debug: vhci_driver.c:367:[usbip_vhci_attach_device2] writing: 0 3 131073 2
libusbip: debug: vhci_driver.c:372:[usbip_vhci_attach_device2] attach attribute path: /sys/devices/platform/vhci_hcd.0/attach
usbip: debug: sysfs_utils.c:18:[write_sysfs_attribute] error opening attribute /sys/devices/platform/vhci_hcd.0/attach
libusbip: debug: vhci_driver.c:376:[usbip_vhci_attach_device2] write_sysfs_attribute failed
usbip: error: import device

root@STM32exp:/sys/devices/platform/vhci_hcd.0# /usr/local/bin/usbip --debug --tcp-port 2001 attach -r localhost -b 2-1
usbip: debug: usbip_network.c:28:[usbip_setup_port_number] parsing port arg '2001'
usbip: info: using port 2001 ("2001")
usbip: debug: usbip.c:129:[run_command] running command: `attach'
libusbip: debug: vhci_driver.c:269:[usbip_vhci_driver_open] available ports: 16
libusbip: debug: vhci_driver.c:281:[usbip_vhci_driver_open] available controllers: 1
libusbip: debug: vhci_driver.c:128:[refresh_imported_device_list] controller 0
libusbip: debug: vhci_driver.c:67:[parse_status] hub hs port 0 status 4 speed 0 devid 0
libusbip: debug: vhci_driver.c:69:[parse_status] sockfd 0 lbusid 0-0
[...]
libusbip: debug: vhci_driver.c:104:[parse_status] exit
usbip: debug: usbip_attach.c:100:[import_device] got free port 0
libusbip: debug: vhci_driver.c:367:[usbip_vhci_attach_device2] writing: 0 3 131073 2
libusbip: debug: vhci_driver.c:372:[usbip_vhci_attach_device2] attach attribute path: /sys/devices/platform/vhci_hcd.0/attach
usbip: debug: sysfs_utils.c:18:[write_sysfs_attribute] error opening attribute /sys/devices/platform/vhci_hcd.0/attach
libusbip: debug: vhci_driver.c:376:[usbip_vhci_attach_device2] write_sysfs_attribute failed
usbip: error: import device