dopey: iot-gateway-hikey mbolivar$ udevadm monitor
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent

KERNEL[16664.921888] add      /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4 (usb)
KERNEL[16664.923234] add      /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4/1-2.4:1.0 (usb)
UDEV  [16664.929235] add      /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4 (usb)
UDEV  [16664.930526] add      /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4/1-2.4:1.0 (usb)
^Cdopey: iot-gateway-hikey mbolivar$ sudo fastboot devices
[sudo] password for mbolivar:
0123456789abcdef	fastboot