# example binding slcan to a USB tty serial port sudo slcand -o -s3 -t hw -S 3000000 /dev/ttyACM3 sudo ip link set dev can0 up type can bitrate 100000 # ## to upgrade usb devices in chromium ## #Creating a udev rule to grant write permissions to a USB device and automate updating a dongle involves the following steps: #1. Identify the USB Device # #Plug in the USB device or dongle and identify its attributes using lsusb or udevadm. #Using lsusb: # #Run: # #lsusb # #Find your device in the list. It will look something like this: # #Bus 001 Device 004: ID 1234:5678 Vendor_Name Product_Name # # Vendor ID: 1234 # Product ID: 5678 # #Using udevadm: # #Run: # #udevadm info --query=all --name=/dev/bus/usb/001/004 # #(Replace 001 and 004 with the values from lsusb.) # #This command provides detailed information about the device, such as the idVendor and idProduct. #2. Create a udev Rule # #Create a new file for your custom udev rules in /etc/udev/rules.d/. # #For example: # #sudo nano /etc/udev/rules.d/99-usb-dongle.rules # #Add the following rule: # #SUBSYSTEM=="usb", ATTR{idVendor}=="1234", ATTR{idProduct}=="5678", MODE="0666" # # Replace 1234 and 5678 with your device's Vendor and Product IDs. # MODE="0666" grants read and write permissions to all users. For more restricted access, specify a group and set group ownership (e.g., GROUP="usbusers" and MODE="0660"). # #3. Reload udev Rules # #After saving the rule, reload udev rules and trigger them: # #sudo udevadm control --reload-rules #sudo udevadm trigger # #4. Test Permissions # #Unplug and replug your device, then check the permissions: # #ls -l /dev/bus/usb/001/004 # #(Replace 001 and 004 with the actual bus and device numbers.) # #It should now show the updated permissions. #5. Automate Dongle Updates # #If you have a script or tool to update the dongle, ensure it runs as the user with proper permissions. For example, create an update script: # ##!/bin/bash #echo "Updating dongle..." ## Replace with the actual command to update your dongle #your-update-command --device=/dev/bus/usb/001/004 # #Make it executable: # #chmod +x update_dongle.sh # #Run the script after ensuring permissions are correct. #6. Optional: Match by Serial Number or Other Attributes # #If multiple devices share the same Vendor/Product IDs, you can refine the rule by matching additional attributes like serial, idProduct, or idVendor. # #Example: # #SUBSYSTEM=="usb", ATTR{idVendor}=="1234", ATTR{idProduct}=="5678", ATTR{serial}=="ABCDEFG12345", MODE="0666" # #You can find these attributes using: # #udevadm info --attribute-walk --name=/dev/bus/usb/001/004 # # #