On 03.06.2013 10:03, Aleksander Morgado wrote:
> On 02/06/13 17:31, W. Martin Borgert wrote:
>>> As a workaround, set up a udev rule to:
>>>> - set the group and mode on the device
>>>> - create a non-changing symlink name to the changing device name
>>>> - tell ModemManager not to touch the device
>>>>
>>>> Create a file, say /etc/udev/rules.d/99-local.rules
>>>>
>>>> SUBSYSTEM=="tty", ATTRS{idVendor}=="067b", ATTRS{idProduct}=="2303",
>>>> GROUP="users", MODE="0660", SYMLINK+="gps"
>>>> ACTION=="add|change", SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device",
>>>> ATTRS{idVendor}=="067b", ATTRS{idProduct}=="2303",
>>>> ENV{ID_MM_DEVICE_IGNORE}="1"
>> Many thanks for this idea! For me, personally, it probably is
>> not an option, however:
>>
>> Unfortunately, a "PL2303 Serial Port" is a relatively common USB
>> serial adaptor which might be used both inside an USB modem or an
>> external adaptor for any kind of serial device. So there is no
>> other way than probing the device (e.g. sending AT commands at
>> 115200 bps and hoping for a readable response, or just reading at
>> 4800 bps and looking out for readable NMEA datagrams).
>>
>> Maybe in the very distant future, MM would not probe the serial
>> device at all - instead I imagine a "serial detector" software
>> component, that does all kind of probing and only sends signals on
>> the DBus about the result ("modem found at /dev/ttyUSB0", "GPS
>> found at /dev/ttyUSB1", "voltmeter found...").
>
> In MM git master, USB<->RS232 adaptors are never probed by default when
> detected, so there shouldn't be any direct conflict. Instead, they will
> only be probed to look for modems if Scan() is called explicitly.
Are you saying that there is no more need for acrobatics[1] regarding
analog modems and UPSes connected to the serial ports or via adapters.
poma
[1]
https://lists.fedoraproject.org/pipermail/users/2012-December/428039.html
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