![]() Udevadm info starts with the device specified by the devpath and then To list the assigned interfaces, just run: Other possibilities could be ttyS or ttyACM. In my case, I already know that Linux grouped my devices under default UART-over-USB name, so ttyUSBx ( x stands for the incremental index ). So, first of all you need to find out which /dev/tty interface the machine assigned to the devices. Udev is a device manager for the Linux kernel, able to manage the device nodes in the /dev directory. $ Linux command to be executed as a regular non-privileged user.# Linux command to be executed with root privileges.reload the rules in order to apply the changes.write the udev rule that uses the environment variable to create the specific SYMLINK.identify the environment variable required to distinguish the devices, using udevadm command.To avoid this problem I had to refer to a symbolic link to these devices, which should remain valid between reboots. This means that for some switching-on the ttyUSB0 port was associated to device A and ttyUSB1 to device B, some other vice versa. In my case, the two devices were generally assigned the values 0 and 1, without being able to control the order of assignment. Here there is a parameter that could be troublesome to manage at runtime, especially with more than one device to be acknowledged: I'm talking about the COM_name.Īt the boot time, the machine assigns random numbers for each ttyUSB devices plugged, apparently without following logical process. These few lines of code are for open a serial communication via COM port, and start reading the stream coming from the connected device. ![]() Enter fullscreen mode Exit fullscreen mode
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