WebSerial API Device cannot open port on Ubuntu

Question

I have tried to use the WebSerial API on Ubuntu after it worked on Windows and ChromeOS. When I try to connect a device, i get this error: DOMException: Failed to open serial port. Error

I have created a udev rule but it did not work.

SUBSYSTEM=="tty", ATTR{idVendor}=="0eb8", ATTR{idProduct}=="f010", ATTRS{serial}=="0000:00:14.0", SYMLINK+="ttyMettler0"

The device info:

looking at device '/devices/pci0000:00/0000:00:14.0/usb1/1-6':
    KERNEL=="1-6"
    SUBSYSTEM=="usb"
    DRIVER=="usb"
    ATTR{idProduct}=="f010"
    ATTR{bNumConfigurations}=="1"
    ATTR{avoid_reset_quirk}=="0"
    ATTR{configuration}==""
    ATTR{bNumInterfaces}==" 2"
    ATTR{ltm_capable}=="no"
    ATTR{quirks}=="0x0"
    ATTR{manufacturer}=="METTLER TOLEDO"
    ATTR{serial}=="67022056LW"
    ATTR{speed}=="12"
    ATTR{urbnum}=="10"
    ATTR{busnum}=="1"
    ATTR{tx_lanes}=="1"
    ATTR{bConfigurationValue}=="1"
    ATTR{devnum}=="5"
    ATTR{bDeviceSubClass}=="00"
    ATTR{bmAttributes}=="c0"
    ATTR{idVendor}=="0eb8"
    ATTR{version}==" 1.10"
    ATTR{authorized}=="1"
    ATTR{maxchild}=="0"
    ATTR{product}=="BCA-222-60U-1301-120 "
    ATTR{bcdDevice}=="100f"
    ATTR{bDeviceClass}=="02"
    ATTR{rx_lanes}=="1"
    ATTR{bMaxPacketSize0}=="8"
    ATTR{bMaxPower}=="500mA"
    ATTR{devpath}=="6"
    ATTR{removable}=="removable"
    ATTR{bDeviceProtocol}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb1':
    KERNELS=="usb1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bMaxPower}=="0mA"
    ATTRS{version}==" 2.00"
    ATTRS{devpath}=="0"
    ATTRS{busnum}=="1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{removable}=="unknown"
    ATTRS{authorized_default}=="1"
    ATTRS{serial}=="0000:00:14.0"

Is my udev correct? Has anyone a similar problem?

Please put the udev rule in the question itself rather than a screenshot — Jon
– Jon, Commented Jul 27, 2020 at 19:23
Check that the udev rule is actually taking effect and the user running Chrome is capable of opening the device node. — Reilly Grant
– Reilly Grant, Commented Jul 27, 2020 at 21:26
@ReillyGrant I've added some more details. The runnig user is admin and in all groups — Patrick
– Patrick, Commented Jul 29, 2020 at 7:17
When you select the port in Chrome it should list the device name, something like "ttyUSB0". If you run ls -l /dev/ttyUSB0 are the ownership and permissions on the file set up so that the user running Chrome can access it? — Reilly Grant
– Reilly Grant, Commented Jul 30, 2020 at 17:25

Dharman · Accepted Answer · 2020-09-01 09:16:04Z

11

In my case, this problem was solved by adding my user to the "dialout" group with sudo adduser [username] dialout (take into account that the machine should be restarted after that) and then it worked!.

edited Sep 1, 2020 at 9:16

Dharman♦

33.9k27 gold badges106 silver badges157 bronze badges

answered Sep 1, 2020 at 9:10

Pedro Monteagudo

4714 silver badges8 bronze badges

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