Failed to connect to serial port on ubuntu 23.04

[hurelhuyag]

Is this a bug or i'm missing on my OS setup? The error message tells me nothing. Because everywhere I checked looks good.

Listing available ports shows me ttyUSB0 is available.

for (final name in SerialPort.availablePorts) {
   debugPrint("available: $name");
}

Output:

flutter: available: /dev/ttyS4
flutter: available: /dev/ttyUSB0

But when trying to connect it shows me an error.

    for (final name in SerialPort.availablePorts) {
      debugPrint("available: $name");
    }

    final port = SerialPort("/dev/ttyUSB0");
    port.config.baudRate = 9600;
    port.config.parity = SerialPortParity.none;
    //_port.config.bits = 8;
    port.config.stopBits = 2;

Failed at port.config.baudRate = 9600;

Output:

No such file or directory, errno = 2

dmesg output

[  288.638792] usb 1-1: new full-speed USB device number 13 using xhci_hcd
[  288.794074] usb 1-1: New USB device found, idVendor=0403, idProduct=6001, bcdDevice= 6.00
[  288.794092] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  288.794099] usb 1-1: Product: FT232R USB UART
[  288.794106] usb 1-1: Manufacturer: FTDI
[  288.794111] usb 1-1: SerialNumber: A10KUSXQ
[  288.799551] ftdi_sio 1-1:1.0: FTDI USB Serial Device converter detected
[  288.799647] usb 1-1: Detected FT232R
[  288.801176] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0

groups output

hurlee adm dialout cdrom sudo dip plugdev users lpadmin lxd docker

ls -l /dev/ttyUSB0 output:

crw-rw-rw- 1 root dialout 188, 0 Oct 10 13:38 /dev/ttyUSB0

[hurelhuyag]

Finally, I found a workaround. call port.manufacturer getter before initiating the connection. But I have no idea why this is important.

[hurelhuyag]

Hehe, It is actually debugPrint("print anything before open serial port");

[hurelhuyag]

Hello @jpnurmi? Do you know why is this happening?

[hurelhuyag]

Now it works only flutter run, But the same error happens if I create a build.

This is the output of the program:

flutter: Bus 001 Device 017: ID 0403:6001 FTDI FT232R USB UART A10KUSXQ
flutter: Name: /dev/ttyUSB0, Transport: 1
flutter: Opening serial port /dev/ttyUSB0
[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: oba: No such file or directory, errno = 2
*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
pid: 85010, tid: 139896941438656, name io.flutter.ui
os: linux arch: x64 comp: no sim: no
build_id: '1a09bcfba616485d3cc6cbeda1e5a247'
isolate_dso_base: 7f3c741fa000, vm_dso_base: 7f3c741fa000
isolate_instructions: 7f3c74370880, vm_instructions: 7f3c7436a000
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    #456 abs 00007f3c745d191d virt 00000000003d791d _kDartIsolateSnapshotInstructions+0x26109d
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    #465 abs 00007f3c745d191d virt 00000000003d791d _kDartIsolateSnapshotInstructions+0x26109d
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    #469 abs 00007f3c743b5a4d virt 00000000001bba4d _kDartIsolateSnapshotInstructions+0x451cd
    #470 abs 00007f3c745d191d virt 00000000003d791d _kDartIsolateSnapshotInstructions+0x26109d
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    #473 abs 00007f3c743b5a4d virt 00000000001bba4d _kDartIsolateSnapshotInstructions+0x451cd
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    #475 abs 00007f3c745cda22 virt 00000000003d3a22 _kDartIsolateSnapshotInstructions+0x25d1a2
    #476 abs 00007f3c7448ee3c virt 0000000000294e3c _kDartIsolateSnapshotInstructions+0x11e5bc
    #477 abs 00007f3c743b5a4d virt 00000000001bba4d _kDartIsolateSnapshotInstructions+0x451cd
    #478 abs 00007f3c745d191d virt 00000000003d791d _kDartIsolateSnapshotInstructions+0x26109d
    #479 abs 00007f3c745cdea1 virt 00000000003d3ea1 _kDartIsolateSnapshotInstructions+0x25d621
    #480 abs 00007f3c743b6149 virt 00000000001bc149 _kDartIsolateSnapshotInstructions+0x458c9
    #481 abs 00007f3c745d191d virt 00000000003d791d _kDartIsolateSnapshotInstructions+0x26109d
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    #483 abs 00007f3c7448ee3c virt 0000000000294e3c _kDartIsolateSnapshotInstructions+0x11e5bc
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    #485 abs 00007f3c745d191d virt 00000000003d791d _kDartIsolateSnapshotInstructions+0x26109d
    #486 abs 00007f3c745d0ef6 virt 00000000003d6ef6 _kDartIsolateSnapshotInstructions+0x260676
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    #488 abs 00007f3c745abc26 virt 00000000003b1c26 _kDartIsolateSnapshotInstructions+0x23b3a6
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    #490 abs 00007f3c745abb8c virt 00000000003b1b8c _kDartIsolateSnapshotInstructions+0x23b30c
    #491 abs 00007f3c745aba67 virt 00000000003b1a67 _kDartIsolateSnapshotInstructions+0x23b1e7
    #492 abs 00007f3c745ab9fe virt 00000000003b19fe _kDartIsolateSnapshotInstructions+0x23b17e
    #493 abs 00007f3c745ab9ab virt 00000000003b19ab _kDartIsolateSnapshotInstructions+0x23b12b
    #494 abs 00007f3c74386a9a virt 000000000018ca9a _kDartIsolateSnapshotInstructions+0x1621a
    #495 abs 00007f3c745c926e virt 00000000003cf26e _kDartIsolateSnapshotInstructions+0x2589ee
    #496 abs 00007f3c743887f1 virt 000000000018e7f1 _kDartIsolateSnapshotInstructions+0x17f71
    #497 abs 00007f3c7438877a virt 000000000018e77a _kDartIsolateSnapshotInstructions+0x17efa
    #498 abs 00007f3c745fd233 virt 0000000000403233 _kDartIsolateSnapshotInstructions+0x28c9b3
    #499 abs 00007f3c7438852f virt 000000000018e52f _kDartIsolateSnapshotInstructions+0x17caf