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Allows to control Gembird SIS-PM USB outlet devices via USB.

Rust port of [python-sispm](https://github.com/jerch/python-sispm).
See also [sispmctl](https://sourceforge.net/projects/sispmctl/) (C deamon)

# Permissions

Per default, only root is allowed to use devices directly, therefore the SiS-PM also only works as root.

To allow group sispmctl access create file `/lib/udev/rules.d/60-sispmctl.rules` with the following content

    SUBSYSTEM=="usb", ATTR{idVendor}=="04b4", ATTR{idProduct}=="fd10", GROUP="sispmctl", MODE="660"
    SUBSYSTEM=="usb", ATTR{idVendor}=="04b4", ATTR{idProduct}=="fd11", GROUP="sispmctl", MODE="660"
    SUBSYSTEM=="usb", ATTR{idVendor}=="04b4", ATTR{idProduct}=="fd12", GROUP="sispmctl", MODE="660"
    SUBSYSTEM=="usb", ATTR{idVendor}=="04b4", ATTR{idProduct}=="fd13", GROUP="sispmctl", MODE="660"
    SUBSYSTEM=="usb", ATTR{idVendor}=="04b4", ATTR{idProduct}=="fd15", GROUP="sispmctl", MODE="660"

Then reload the udev rules with

    udevadm control --reload-rules