Wireless XHC-HB04 pendant 'always connected'

Evidently, no error is reported by 'libusb_control_transfer' (called from 'xhc-hb04.cc') when the wireless pendant (model WHB04-L) is switched off.

This means 'require_pendant' in INI stanza [XHC_HB04_CONFIG] has no effect: HAL pin xhc-hb04.connected is always asserted.

Is this a limitation of the XHC (wireless) pendant / USB dongle design, or is there a workaround to correctly acquire pendant status?

LCNC version is current Master (Debian OS).

Connection loss occurs when you remove the usb connection.

excerpt: configs/sim/axis/xhc-hb04/README

When require_pendant = no, the xhc-hb04 hal pins will be created even if the pendant is not connected at startup. A new connection, a disconnect, and a reconnect are supported.

Ref:
github.com/LinuxCNC/linuxcnc/blob/master...axis/xhc-hb04/README

From the man page

(bit out) xhc-hb04.connected True when connection to the pendant is established over the USB interface.

Ref:
linuxcnc.org/docs/devel/html/man/man1/xhc-hb04.1.html

Thank you - 'libusb' scope being only the USB interface, it is understood that HID status is an application layer issue - and as for wireless USB devices in general, the driver is unaware of absence of device power, wireless link error rate, etc.