Re: MM 0.6.0 conflicts with USB GPS device?

["W. Martin Borgert" <debacle debian org>]

On 2013-06-02 19:46, Glen Turner 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...").

Cheers