[mythtv-users] link-local and mythtv

[Stephen Worthington]

On Tue, 04 Aug 2015 19:47:20 +0100, you wrote:

>Hi:  I'm sending this from a kubuntu/myth laptop using a BTWifi-with-FON 
>connection to a nearby hotspot, and have a link-local wired ethernet 
>connection to a TV for full-screen display by UPnP.  It works, but it 
>seems that I need to keep the TV permanently 'on,' and not on 'standby,' 
>to get full myth functionality when using the laptop screen.  I wonder 
>if there's a way round this.
>
>When things are working the backend shows
>
>2015-08-04 18:54:44.142106 I  Listening on TCP 127.0.0.1:6544
>2015-08-04 18:54:44.142155 I  Listening on TCP 169.254.10.241:6544
>
>but if I run mythtv-setup.real with the TV in standby I see
>
>2015-08-04 18:47:42.160183 C  ServerPool: Host is configured to listen 
>on 169.254.10.241, but address is not used on any local network interfaces.
>2015-08-04 18:47:42.160807 I  Binding to UDP 127.0.0.1:6948
>
>and starting the FE/BE in this condition doesn't connect.
>
>If, after a good start, I switch the TV back to standby, the 
>laptop-screen-based system seems to do most things, although I don't 
>know how far I could push this.  My cutting script hangs, right at the 
>end, waiting for mythpreviewgen; it completes with the TV on.
>
>I suppose what I'm wanting is a fallback to 127.0.0.1 if the link-local 
>device (needed for UPnP) isn't active.  Is there a way of getting this?
>
>Thanks,
>
>John P

I do not know of any automatic fallback method, and MythTV is
unfortunately unable at present to listen on multiple IP addresses. If
you are not using anything except a local mythfrontend on your laptop,
then you should be OK using 127.0.0.1 for MythTV and that should not
interfere with using the TV when it is on, as mythfronted does not
actually run on the TV.  So the TV will just be getting the display
data from the laptop without any reference to the software on the
laptop creating the display data - it does not talk to MythTV, just
the laptop display drivers or maybe X somewhere.

Using static IP addresses for the laptop and TV will not work either,
as ethernet ports in Linux that have nothing connected to them go
down, and when down, the static IP address disappears.  If you have a
small ethernet switch, then connecting the laptop and the TV to it and
using static IP addresses should work, but then the switch would have
to remain powered up, instead of the TV.