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| -rw-r--r-- | README.rst | 29 |
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@@ -128,3 +128,32 @@ Install PHP and the PHP rrd extension (``pear install pecl/rrd``) to make it work. Run ``gen-html.php`` every 5 minutes. + + +Static USB device name +====================== +When you have multiple serial USB devices attached to the computer, +rebooting may lead to switched ttyUSB* numbers. + +A solution is to define a udev rule in ``/etc/udev/rules.d/99-usb-wde1.rules``:: + + SUBSYSTEM=="tty", ATTRS{serial}=="XQJ2EJEMADDFYBD3", SYMLINK+="usbwde1" + +You can find the serial number in ``dmesg`` output:: + + usb 1-3: new full-speed USB device number 2 using xhci_hcd + usb 1-3: New USB device found, idVendor=10c4, idProduct=ea60, bcdDevice= 1.00 + usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 + usb 1-3: Product: ELV USB-WDE1 Wetterdatenempfänger + usb 1-3: Manufacturer: Silicon Labs + usb 1-3: SerialNumber: XQJ2EJEMADDFYBD3 + +After creating the file, activate it:: + + $ udevadm control --reload + $ udevadm trigger + +Now a file ``/dev/usbwde1`` exists. + +Modify ``munin/usb-wde1-log-last.sh`` to use the new device file instead +of ``ttyUSB0``. |