LIBUSB_ERROR_NO_DEVICE

[koroki]

Hi,
I'm using the common ws2801 leds in a x86-64 system. The easiest way that I found to use it was to use this hack with usbasp. It works perfectly, it is especially confortable because the USBASP are small. But, there is a unconformable problem for me. When the USB is disconnected, usually because the computer is moved a little bit and the usb loses the connection for a while, the hyperiond give this error:

Error while writing data to Hyperion led controller (LIBUSB_ERROR_NO_DEVICE)

But it doesn't stop. And systemd has no error signal. For systemd the status is "Active: active (running)". For this reason, it is not automatic restarted. And I should restarted for myself.

Is there any way to autorestart?

[koroki]

Well, I found a way to restart the hyperion using udevrules: when the usb is reconnected, the udev kill the previous hyperiond. If the systemd unit has auto-restart on fail, it is restarted and all works again. I changed the group of the USBAVP to uucp and introduce the user that launch kodi to control hyperiond with kodi.

I'll copy here the files:

/etc/systemd/system/hyperion.service:
[Unit]
Description=Hyperion Systemd service

[Service]
Type=simple
User=kodi
Group=uucp
UMask=007
ExecStart=/usr/bin/hyperiond /etc/hyperion/hyperion.config.json
ExecReload=/bin/kill -HUP $MAINPID
Restart=on-failure
TimeoutStopSec=10

[Install]
WantedBy=multi-user.target

/etc/udev/rules.d/99-USBasp.rules
# Set Group for USBasp
SUBSYSTEM=="usb", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="05dc", GROUP="uucp", RUN="/usr/local/bin/kill_hyperion"

/usr/local/bin/kill_hyperion (group uucp and the proper permissions!):
#!/bin/bash
kill -9 `ps -aux | grep hyperiond | awk '{print $2}'`