Connectiviy problem - solved

[Mario Pilz]

Dear Rick,

actually adding the user to the group worked out fine and I could 
finally connect my Suunto D4i.
Thanks a lot to you and Willem, Miika and Robert for such a good and 
quick support! Hope to be able to return elsewhere.

Best wishes,

Mario


On 4/24/2014 3:34 AM, Rick Walsh wrote:
> Mario,
>
> We're getting close to the solution now. And it is worth persisting.
>
> On 24 April 2014 05:46, Robert C. Helling <helling at atdotde.de> wrote:
>> On 23 Apr 2014, at 21:09, Mario Pilz <mariopilz at gmx.net> wrote:
>>
>> Mario,
>>
>>> 2. Then I run: sudo tail -f /var/log/syslog
>>> Output: usb 2-1.1: FTDI USB Serial Device converter now attached to ttyUSB0
>>>
>> OK, then /dev/ttyUSB0 is your device (capitalisation is important).
>>
>> Please do
>>
>> sudo chmod a+rw /dev/ttyUSB0
>>
>> after connecting the cable and the D4. If that solves the problem, then it is really the permissions problem that we are all trying to address. But it might be something else. Unfortunatly, this solution is only good until the next reboot (or possibly disconnect of the cable, I am not sure).
>>
> Your issue may just be capitalization. Double check that you are
> specifying /dev/ttyUSB0 in subsurface.
>
> In order to establish permissions, there are two different ways:
> 1) Add yourself to the group that has 'write' access to the device
> (this is recommended)
> 2) Change the permissions of the device (like Robert's suggestion
> above, which gives all users write access to the device)
>
> The first method is preferable because it is permanent. The device
> files /dev/ttyUSB0 is created when you plug in the cable, so I think
> changing permissions will only work until the next time you plug in
> the cable or reboot. Giving non-privileged users write access to a
> device is also not recommended, but if you're the only user, and the
> device is a dive-computer, it probably isn't an issue in itself.
>
> On most systems, the group is dialout, but some may be special. To
> confirm what the required group is, after plugging in the cable (the
> device file is created when you plug in the cable) enter on the
> command line (as suggested by Robert before):
>
> ls -l /dev/ttyUSB0
>
> The output should look something like (on my system, Febora 20)
> crw-rw----. 1 root dialout 188, 0 Apr 24 07:18 /dev/ttyUSB0
>
> This shows that the owner of the device is 'root', and its group is
> 'dialout'. This means you need to be a member of that group to have
> write access. Double check you are with the command:
>
> groups
>
> This will list all groups you belong to, for me:
> rick wheel dialout pkg-build
>
> If the group that /dev/ttyUSB0 belongs to isn't listed there, add
> yourself to it.
>
> sudo usermod -a -G dialout mario
>
> Log out and the back in again before trying to download from your dive computer.
>
> Cheers,
>
> Rick


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