Hey Sahlan,
The fact that you have a network on the same subnet but a different device
is probably what is preventing you from contacting the Jolla device.
Your computer has 2 routes for 192.168.2.0/24 which would lead to
unpredictable behavior.
If you connect the Jolla device on WiFi to this 192.168.2.x network and
make sure that it gets assigned 192.168.2.15 as IP address the SDK might be
"fooled" (I never tried this but since SSH access is available on the WiFi
interface of the device it is likely to work)
HTH,
Eli

Op vr 19 jul. 2019 om 13:08 schreef Sahlan <sah...@businessassistant.biz>:

> Eli,
>
> Thank you for the quick response. My development network happens to be all
> 192.168.2.x addresses, with the router as 192.168.2.1. No other device is
> using 192.168.2.15. The i.p. of the Ubuntu machine to which the sailfish
> mobile  is connected is 192.168.2.42,
>
> Regards,
>
> Sahlan
>
> ------ Original Message ------
> From: "E.S. Rosenberg" <es.rosenberg+sailfishos....@gmail.com>
> To: "Sahlan" <sah...@businessassistant.biz>; "Sailfish OS Developers" <
> devel@lists.sailfishos.org>
> Sent: 19/07/2019 10:53:07
> Subject: Re: [SailfishDevel] Question about connecting a Sailfish phone to
> Ubuntu Linux box
>
> Depending on how your network connections are setup it could be that you
> have to manually trigger the USB-ethernet connection to become active.
> You can check if you have an interface with the address 192.168.2.1 on you
> machine, the SailfishOS device is always at 192.168.2.15.
> HTH,
> Eli
>
> Op vr 19 jul. 2019 om 12:28 schreef Sahlan <sah...@businessassistant.biz>:
>
>> Hello,
>>
>> I am currently developing and porting some C++ apps to a variety of
>> operating systems, including Sailfish. I live in the Republic Of Ireland,
>> so the first problem was to find a Sailfish phone! I have purchased a phone
>> which is running Sailfish 3 and have set up Developer Mode on it. On Ubuntu
>> 18.04 LTS, I installed the Sailfish Qt Creator IDE and built a simple test
>> app. I connected the Sailfish phone via USB and confirmed with lsusb that
>> the device is recognised as being connected. Under Tools / Options /
>> Devices, I try to add the phone as a Sailfish OS Physical Device. The IP
>> address, username and password correctly correspond to those on the phone,
>> but clicking "Test Connection" always gives me the message "Host
>> unreachable". Increasing the SSH timeout does not help. I also tried
>> pinging the i.p. address of the phone from a terminal window, and it is not
>> found, though I am not sure whether ping should work with i.p. over usb. I
>> also tried changing the phone i.p. address, in case of address clash, but
>> this does not work either.
>>
>> Can anyone suggest how I might solve this problem? I know that remote
>> connections can be temperamental. For example, I have a Blackberry 10
>> mobile which I can only develop for on a Windows 7 machine, because all
>> other boxes: Windows 10, Linux, Mac fail to recognise the device, even
>> using identical tools and setup procedures!
>>
>> With thanks, in anticipation of some help,
>> Sahlan
>>
>>
>>
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