[mythtvnz] MythTV 0.29 and HDHomeRun

[Brady, Mike]

The attached systemd unit file from the rpmfusion packages for Fedora
have plenty of hints on what to do for various issues. 

On 2017-11-02 09:15, Mark van Dijk wrote:

> ---------- Forwarded message ----------
> From: Stephen Worthington <stephen_agent at jsw.gen.nz>
> To: MythTV in NZ <mythtvnz at lists.ourshack.com>
> Cc: 
> Bcc: 
> Date: Wed, 01 Nov 2017 13:29:21 +1300
> Subject: Re: [mythtvnz] MythTV 0.29 and HDHomeRun
> On Wed, 1 Nov 2017 11:15:31 +1300, you wrote:
> 
>> If you set up MythTV to use the external IP address of the PC (as you
>> do if you are using external frontends), then in v29 that problem
>> should go away.  I suspect that you are just using localhost
>> (127.0.0.1) to connect to the backend, and the localhost interface
>> comes up virtually instantly compared to the real interfaces like
>> Ethernet cards.  In 0.28 and before, if you used the external address
>> of the PC, then mythbackend could come up before it was ready and
>> would decided to drop back to using localhost.  In v29 that should
>> have been fixed and it will wait quite a long time for the specified
>> IP address to become available to bind to.
>> 
>> In 0.28 and before, the normal fix on Ubuntu with systemd was to
>> create a systemd override file for mythtv-backend.service to make it
>> wait for NetworkManager to be running.  NetworkManager normally only
>> signals it is running after the Ethernet interfaces are up.  There are
>> threads on the mythtv-users mailing list that tell you how to do that
>> - it is a bit involved.  But try just changing to using the external
>> IP address of the box first.
>> 
>> If mythbackend ever comes up before a tuner is ready, then it will
>> mark the tuner as unavailable and will not use it.  So if you have
>> tuners that are slow to come up, it can be a good idea to have a
>> systemd override file for mythtv-backend.service that tells it to wait
>> for those tuners before starting mythbackend.  I do not know of any
>> way to do that with HDHomerun tuners, so you will need to make sure
>> they are on and fully up before mythbackend gets started.  For
>> internal tuners, you create a /etc/udev/rules.d/99-tuner.rules file
>> containing this:
>> 
>> #
>> # Create systemd device units for capture devices
>> #
>> SUBSYSTEM=="video4linux", TAG+="systemd"
>> SUBSYSTEM=="dvb", TAG+="systemd"
>> SUBSYSTEM=="firewire", TAG+="systemd"
>> 
>> and then in your systemd override file you put things like this in the
>> [Unit] section:
>> 
>> Wants=dev-dvb-adapter0-frontend0.device
>> After=dev-dvb-adapter0-frontend0.device
>> Wants=dev-dvb-adapter1-frontend0.device
>> After=dev-dvb-adapter1-frontend0.device
>> 
>> A Wants line tells systemd that this unit wants that other unit
>> started.  An After line tells systemd to wait until that other unit
>> signals it is started before starting this unit.
> 
> Thanks very much Stephen!  This is really useful.  I have now verified (via mythbackend.log and kern.log) that the mythbackend is definitely trying to connect to the HDHomeRun before the eth0 interface is ready.   
> 
> As you suggest, I changed the IP address in my MythBackend setup to point to the real IP address rather than 127.0.0.1.  I had to modify the MYSQL config file to bind to 0.0.0.0 rather than 127.0.0.1 so that the backend could actually connect.  Unfortunate there was no change - the issue persists and the backend is still trying to connect to the HDHomeRun before the network is up. 
> 
> I shall have a hunt around online to see how I can delay the mythbackend via systemmd. 
> 
> Cheers
> 
> Mark
> 
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