udev rule voor /dev/ttyUSBx

donderdag 25 augustus 2022 16:03

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Topicstarter

Ik zit wat in de knoei met udev rules. Ik heb 2 P1 poort naar USB converters en 1 modbus naar USB converters aan mijn RPI4 hangen. Elke boot hebben de converters allemaal een random device name van /dev/ttyUSB0../dev/ttyUSB2 wat erg vervelend is. Dat probeer ik nu op te lossen door een udev rule aan te maken alsvolgt:

code:

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SUBSYSTEM=="usb", ATTRS{bcdDevice}=="0263", SYMLINK+="modbus", OWNER="telegraf", GROUP="root"
SUBSYSTEM=="usb", ATTRS{serial}=="AB6BZJJJ", SYMLINK+="p1-homeassistant", OWNER="telegraf", GROUP="root"
SUBSYSTEM=="usb", ATTRS{serial}=="AB6C1MBS", SYMLINK+="p1-python2influxdb", OWNER="telegraf", GROUP="root"

code:

root@stats:~# ls -lah /dev/modbus 
lrwxrwxrwx 1 root root 15 Aug 25 15:45 /dev/modbus -> bus/usb/001/003
root@stats:~# ls -lah /dev/ttyUSB2 
crw-rw---- 1 telegraf telegraf 188, 2 Aug 25 15:59 /dev/ttyUSB2
root@stats:~#

Als ik dan telegraf herstart en ipv naar /dev/ttyUSB2 laat verwijzen maar naar /dev/modbus dan krijg ik volgende in de log file:

code:

root@stats:~# tail -f /var/log/telegraf/telegraf
2022-08-25T16:00:36+02:00 E! [inputs.modbus] Error in plugin: serial: could not set setting: inappropriate ioctl for device
2022-08-25T16:00:38+02:00 E! [inputs.modbus] Error in plugin: serial: could not set setting: inappropriate ioctl for device
2022-08-25T16:00:40+02:00 E! [inputs.modbus] Error in plugin: serial: could not set setting: inappropriate ioctl for device
2022-08-25T16:00:42+02:00 E! [inputs.modbus] Error in plugin: serial: could not set setting: inappropriate ioctl for device
2022-08-25T16:00:44+02:00 E! [inputs.modbus] Error in plugin: serial: could not set setting: inappropriate ioctl for device
2022-08-25T16:00:46+02:00 E! [inputs.modbus] Error in plugin: serial: could not set setting: inappropriate ioctl for device
2022-08-25T16:00:48+02:00 E! [inputs.modbus] Error in plugin: serial: could not set setting: inappropriate ioctl for device
2022-08-25T16:00:50+02:00 E! [inputs.modbus] Error in plugin: serial: could not set setting: inappropriate ioctl for device
2022-08-25T16:00:52+02:00 E! [inputs.modbus] Error in plugin: serial: could not set setting: inappropriate ioctl for device
2022-08-25T16:00:54+02:00 E! [inputs.modbus] Error in plugin: serial: could not set setting: inappropriate ioctl for device

Ah ja /dev/modbus verwijst naar het relatieve pad bus/usb/001/003 .

Dus nu is mijn vraag, hoe laat ik /dev/ttyUSB2 "verdwijnen" of hoe zorg ik ervoor dat die niet meer wordt aangemaakt maar dat gewoon /dev/modbus wordt aangemaakt zonder dat dat een symlink is?

EDIT:
En als ik Home Assistant de digitale meter wil laten uitlezen op /dev/p1-homeassistant werkt dat niet. Op /dev/ttyUSB1 werkt het wel... .

donderdag 25 augustus 2022 16:33

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bucovaina89

Topicstarter

En nog een kleine toevoeging. Als ik de modbus controller probeer uit te lezen met mbpoll op /dev/ttyUSB2, no problemo. Maar op /dev/modbus wel alsook /dev/usb/00*/00* (ik heb ze allemaal geprobeerd)

code:

pi@stats:~/ansilbe $ ls -lah /dev/modbus 
lrwxrwxrwx 1 root root 15 Aug 25 16:14 /dev/modbus -> bus/usb/001/003
pi@stats:~/ansilbe $ sudo mbpoll -q  -a 1 -b 38400 -t 3 -c 6 -o 2 /dev/bus/usb/001/003 -r 122
mbpoll: Connection failed: Connection refused.
pi@stats:~/ansilbe $ sudo mbpoll -q  -a 1 -b 38400 -t 3 -c 6 -o 2 /dev/ttyUSB2 -r 122
-- Polling slave 1... Ctrl-C to stop)
[122]:  2
[123]:  0
[124]:  4
[125]:  0
[126]:  71
[127]:  24
^C--- /dev/ttyUSB2 poll statistics ---
1 frames transmitted, 1 received, 0 errors, 0.0% frame loss

everything was closed.
Have a nice day !
pi@stats:~/ansilbe $ sudo mbpoll -q  -a 1 -b 38400 -t 3 -c 6 -o 2 /dev/bus/usb/00 -r 122
001/ 002/ 
pi@stats:~/ansilbe $ ls -lah /dev/bus/usb/00*/*
crw-rw-r-- 1 root     root 189,   0 Aug 25 16:14 /dev/bus/usb/001/001
crw-rw-r-- 1 root     root 189,   1 Aug 25 16:14 /dev/bus/usb/001/002
crwxrwxrwx 1 telegraf root 189,   2 Aug 25 16:14 /dev/bus/usb/001/003
crw-rw-r-- 1 telegraf root 189,   3 Aug 25 16:14 /dev/bus/usb/001/004
crw-rw-r-- 1 telegraf root 189,   4 Aug 25 16:14 /dev/bus/usb/001/005
crw-rw-r-- 1 root     root 189, 128 Aug 25 16:14 /dev/bus/usb/002/001
crw-rw-r-- 1 root     root 189, 129 Aug 25 16:14 /dev/bus/usb/002/002
pi@stats:~/ansilbe $

donderdag 25 augustus 2022 16:37

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Daedalus

Moderator Apple Talk

Keep tryin'

Vermoed dat het SUBSYSTEM=="tty" moet zijn. Je wilt een serial device, en niet de rauwe (bovenliggende) USB device. Zie ook Persistent names for USB-serial devices in Linux (/dev/ttyUSBx -> /dev/custom-name).

“You know what I've noticed Hobbes? Things don't bug you if you don't think about them. So from now on, I simply won't think about anything I don't like, and I'll be happy all the time!” | 宇多田ヒカル \o/

donderdag 25 augustus 2022 17:18

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bucovaina89

Topicstarter

Klinkt idd wel logisch. Het ziet er wat mij betreft al iets beter uit maar het werkt nog niet ... . Met /dev/ttyUSB2 werkt het wel.

code:

pi@stats:~/ansilbe $ sudo mbpoll -q  -a 1 -b 38400 -t 3 -c 6 -o 2 /dev/modbus -r 122
mbpoll: Connection failed: Connection refused.
pi@stats:~/ansilbe $ ls -lah /dev/modbus 
lrwxrwxrwx 1 root root 7 Aug 25 17:13 /dev/modbus -> ttyUSB2
pi@stats:~/ansilbe $

donderdag 25 augustus 2022 17:24

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Daedalus

Moderator Apple Talk

Keep tryin'

Wat zijn je udev rules nu, want de owner/group van de rules in de TS komt niet overeen met wat je nu hebt (root:root, en niet telegraf:root). Heb je ook rules herladen (sudo udevadm control --reload-rules && sudo udevadm trigger), of gereboot?

[ Voor 29% gewijzigd door Daedalus op 25-08-2022 17:25 ]

“You know what I've noticed Hobbes? Things don't bug you if you don't think about them. So from now on, I simply won't think about anything I don't like, and I'll be happy all the time!” | 宇多田ヒカル \o/

donderdag 25 augustus 2022 17:27

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bucovaina89

Topicstarter

deze heb ik nu gedefinieerd. Voor de rest is de udev config "vanilla"

code:

root@stats:~# cat /etc/udev/rules.d/serial-converters.rules 
SUBSYSTEM=="tty", ATTRS{bcdDevice}=="0263", SYMLINK+="modbus", OWNER="telegraf", GROUP="root"
SUBSYSTEM=="tty", ATTRS{serial}=="AB6BZJJJ", SYMLINK+="p1-homeassistant", OWNER="telegraf", GROUP="root"
SUBSYSTEM=="tty", ATTRS{serial}=="AB6C1MBS", SYMLINK+="p1-python2influxdb", OWNER="telegraf", GROUP="root"
root@stats:~#

donderdag 25 augustus 2022 21:00

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bucovaina89

Topicstarter

en misschien is deze info ook nog handig:

code:

root@stats:~# udevadm info -a -n /dev/ttyUSB2 

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.0/ttyUSB2/tty/ttyUSB2':
    KERNEL=="ttyUSB2"
    SUBSYSTEM=="tty"
    DRIVER==""
    ATTR{power/control}=="auto"
    ATTR{power/runtime_active_time}=="0"
    ATTR{power/runtime_status}=="unsupported"
    ATTR{power/runtime_suspended_time}=="0"

  looking at parent device '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.0/ttyUSB2':
    KERNELS=="ttyUSB2"
    SUBSYSTEMS=="usb-serial"
    DRIVERS=="ch341-uart"
    ATTRS{port_number}=="0"
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"

  looking at parent device '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.0':
    KERNELS=="1-1.1:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="ch341"
    ATTRS{authorized}=="1"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceClass}=="ff"
    ATTRS{bInterfaceNumber}=="00"
    ATTRS{bInterfaceProtocol}=="02"
    ATTRS{bInterfaceSubClass}=="01"
    ATTRS{bNumEndpoints}=="03"
    ATTRS{supports_autosuspend}=="1"

  looking at parent device '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1':
    KERNELS=="1-1.1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{authorized}=="1"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bDeviceClass}=="ff"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bMaxPacketSize0}=="8"
    ATTRS{bMaxPower}=="98mA"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bcdDevice}=="0263"
    ATTRS{bmAttributes}=="80"
    ATTRS{busnum}=="1"
    ATTRS{configuration}==""
    ATTRS{devnum}=="3"
    ATTRS{devpath}=="1.1"
    ATTRS{devspec}=="(null)"
    ATTRS{idProduct}=="7523"
    ATTRS{idVendor}=="1a86"
    ATTRS{ltm_capable}=="no"
    ATTRS{maxchild}=="0"
    ATTRS{power/active_duration}=="437370850"
    ATTRS{power/autosuspend}=="2"
    ATTRS{power/autosuspend_delay_ms}=="2000"
    ATTRS{power/connected_duration}=="437370840"
    ATTRS{power/control}=="on"
    ATTRS{power/level}=="on"
    ATTRS{power/persist}=="1"
    ATTRS{power/runtime_active_time}=="437370616"
    ATTRS{power/runtime_status}=="active"
    ATTRS{power/runtime_suspended_time}=="0"
    ATTRS{product}=="USB2.0-Serial"
    ATTRS{quirks}=="0x0"
    ATTRS{removable}=="unknown"
    ATTRS{rx_lanes}=="1"
    ATTRS{speed}=="12"
    ATTRS{tx_lanes}=="1"
    ATTRS{urbnum}=="893468"
    ATTRS{version}==" 1.10"

  looking at parent device '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1':
    KERNELS=="1-1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{authorized}=="1"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bMaxPower}=="100mA"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bcdDevice}=="0421"
    ATTRS{bmAttributes}=="e0"
    ATTRS{busnum}=="1"
    ATTRS{configuration}==""
    ATTRS{devnum}=="2"
    ATTRS{devpath}=="1"
    ATTRS{devspec}=="(null)"
    ATTRS{idProduct}=="3431"
    ATTRS{idVendor}=="2109"
    ATTRS{ltm_capable}=="no"
    ATTRS{maxchild}=="4"
    ATTRS{power/active_duration}=="437371410"
    ATTRS{power/autosuspend}=="0"
    ATTRS{power/autosuspend_delay_ms}=="0"
    ATTRS{power/connected_duration}=="437371410"
    ATTRS{power/control}=="auto"
    ATTRS{power/level}=="auto"
    ATTRS{power/runtime_active_time}=="437371087"
    ATTRS{power/runtime_status}=="active"
    ATTRS{power/runtime_suspended_time}=="0"
    ATTRS{product}=="USB2.0 Hub"
    ATTRS{quirks}=="0x0"
    ATTRS{removable}=="unknown"
    ATTRS{rx_lanes}=="1"
    ATTRS{speed}=="480"
    ATTRS{tx_lanes}=="1"
    ATTRS{urbnum}=="48"
    ATTRS{version}==" 2.10"

  looking at parent device '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1':
    KERNELS=="usb1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{authorized}=="1"
    ATTRS{authorized_default}=="1"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bMaxPower}=="0mA"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bcdDevice}=="0515"
    ATTRS{bmAttributes}=="e0"
    ATTRS{busnum}=="1"
    ATTRS{configuration}==""
    ATTRS{devnum}=="1"
    ATTRS{devpath}=="0"
    ATTRS{idProduct}=="0002"
    ATTRS{idVendor}=="1d6b"
    ATTRS{interface_authorized_default}=="1"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Linux 5.15.56-v7l+ xhci-hcd"
    ATTRS{maxchild}=="1"
    ATTRS{power/active_duration}=="437371570"
    ATTRS{power/autosuspend}=="0"
    ATTRS{power/autosuspend_delay_ms}=="0"
    ATTRS{power/connected_duration}=="437371580"
    ATTRS{power/control}=="auto"
    ATTRS{power/level}=="auto"
    ATTRS{power/runtime_active_time}=="437371571"
    ATTRS{power/runtime_status}=="active"
    ATTRS{power/runtime_suspended_time}=="0"
    ATTRS{product}=="xHCI Host Controller"
    ATTRS{quirks}=="0x0"
    ATTRS{removable}=="unknown"
    ATTRS{rx_lanes}=="1"
    ATTRS{serial}=="0000:01:00.0"
    ATTRS{speed}=="480"
    ATTRS{tx_lanes}=="1"
    ATTRS{urbnum}=="22"
    ATTRS{version}==" 2.00"

  looking at parent device '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0':
    KERNELS=="0000:01:00.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="xhci_hcd"
    ATTRS{ari_enabled}=="0"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x0c0330"
    ATTRS{consistent_dma_mask_bits}=="64"
    ATTRS{current_link_speed}=="5.0 GT/s PCIe"
    ATTRS{current_link_width}=="1"
    ATTRS{device}=="0x3483"
    ATTRS{dma_mask_bits}=="64"
    ATTRS{driver_override}=="(null)"
    ATTRS{enable}=="1"
    ATTRS{irq}=="78"
    ATTRS{local_cpulist}=="0-3"
    ATTRS{local_cpus}=="f"
    ATTRS{max_link_speed}=="5.0 GT/s PCIe"
    ATTRS{max_link_width}=="1"
    ATTRS{msi_bus}=="1"
    ATTRS{msi_irqs/78}=="msi"
    ATTRS{power/control}=="on"
    ATTRS{power/runtime_active_time}=="437371746"
    ATTRS{power/runtime_status}=="active"
    ATTRS{power/runtime_suspended_time}=="0"
    ATTRS{power_state}=="D0"
    ATTRS{reset_method}=="pm bus"
    ATTRS{revision}=="0x01"
    ATTRS{subsystem_device}=="0x3483"
    ATTRS{subsystem_vendor}=="0x1106"
    ATTRS{vendor}=="0x1106"

  looking at parent device '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0':
    KERNELS=="0000:00:00.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="pcieport"
    ATTRS{ari_enabled}=="0"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x060400"
    ATTRS{consistent_dma_mask_bits}=="32"
    ATTRS{current_link_speed}=="5.0 GT/s PCIe"
    ATTRS{current_link_width}=="1"
    ATTRS{device}=="0x2711"
    ATTRS{dma_mask_bits}=="32"
    ATTRS{driver_override}=="(null)"
    ATTRS{enable}=="1"
    ATTRS{irq}=="77"
    ATTRS{local_cpulist}=="0-3"
    ATTRS{local_cpus}=="f"
    ATTRS{max_link_speed}=="5.0 GT/s PCIe"
    ATTRS{max_link_width}=="1"
    ATTRS{msi_bus}=="1"
    ATTRS{power/control}=="on"
    ATTRS{power/runtime_active_time}=="437371755"
    ATTRS{power/runtime_status}=="active"
    ATTRS{power/runtime_suspended_time}=="0"
    ATTRS{power_state}=="D0"
    ATTRS{revision}=="0x10"
    ATTRS{secondary_bus_number}=="1"
    ATTRS{subordinate_bus_number}=="1"
    ATTRS{subsystem_device}=="0x0000"
    ATTRS{subsystem_vendor}=="0x0000"
    ATTRS{vendor}=="0x14e4"

  looking at parent device '/devices/platform/scb/fd500000.pcie/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"

  looking at parent device '/devices/platform/scb/fd500000.pcie':
    KERNELS=="fd500000.pcie"
    SUBSYSTEMS=="platform"
    DRIVERS=="brcm-pcie"
    ATTRS{driver_override}=="(null)"
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"

  looking at parent device '/devices/platform/scb':
    KERNELS=="scb"
    SUBSYSTEMS=="platform"
    DRIVERS=="simple-pm-bus"
    ATTRS{driver_override}=="(null)"
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"

  looking at parent device '/devices/platform':
    KERNELS=="platform"
    SUBSYSTEMS==""
    DRIVERS==""
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"

root@stats:~#

en een vimdiff van beide P1 naar usb adapters en de modbus naar usb adapter

Afbeeldingslocatie: https://tweakers.net/i/zUBhyzbBEYVJhNveIO2jh--4UIA=/800x/filters:strip_exif()/f/image/obnXtahV1KDSyD28q5qBRTsH.png?f=fotoalbum_large

donderdag 25 augustus 2022 23:44

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deHakkelaar

bucovaina89 schreef op donderdag 25 augustus 2022 @ 16:03:
Dus nu is mijn vraag, hoe laat ik /dev/ttyUSB2 "verdwijnen" of hoe zorg ik ervoor dat die niet meer wordt aangemaakt maar dat gewoon /dev/modbus wordt aangemaakt zonder dat dat een symlink is?

Probeer eens SYMLINK= ipv SYMLINK+= :

$ man udev
[..]
   Operators
       "=="
           Compare for equality.

       "!="
           Compare for inequality.

       "="
           Assign a value to a key. Keys that represent a list are reset
           and only this single value is assigned.

       "+="
           Add the value to a key that holds a list of entries.

       "-="
           Remove the value from a key that holds a list of entries.

       ":="
           Assign a value to a key finally; disallow any later changes.

Als ik de naam wil wijzigen van bv een netwerk interface naar wlan0 doe ik onderstaande:

code:

1	SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="c4:e9:84:XX:XX:XX", ATTR{dev_id}=="0x0", ATTR{type}=="1", NAME="wlan0"

Misschien dat je daar wat aan hebt?

There are only 10 types of people in the world: those who understand binary, and those who don't

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