[mythtv-users] Delaying until HDHR tuners are up before starting mythtv-backend

[James Linder]

> On 3 Jan 2023, at 7:44 am, Bill Meek <keemllib at gmail.com> wrote:
> 
> On 1/2/23 16:55, James Abernathy wrote:
>> On Mon, Jan 2, 2023 at 5:42 PM James <jam at tigger.ws <mailto:jam at tigger.ws>> wrote:
>>     > On 3 Jan 2023, at 6:27 am, James Abernathy <jfabernathy at gmail.com <mailto:jfabernathy at gmail.com>> wrote:
>>     >
>>     > When I have my HDHR Quatro tuner connected to my router I'd just use a local-network-pingable service to wait until the tuners were
>>    pingable.
>>     > That works, but to reduce a lot of the network errors I was getting with the HDHR tuners I've been directly connecting them. That's been
>>    working great with no errors due to the connection. But I've been restarting the backend manually to make sure the tuners were up.
>>     >
>>     > You can't use the pingable method of delaying the backend because the 169.254.x.x IP of the HDHR changes every boot. This doesn't affect
>>    mythtv-backend because it uses the tuner ID so I need a new method of waiting on the tuners.
>>    Jim I don't know how you do DNS. I use dnsmasq but every router/modem I've seen also allows you to assign a mac address to an IP so you
>>    always get the same IP on the same device
>>    James
>> If I was connected to a router that is what I do.  In this case I'm directly connecting the HDHR tuner to a 2nd port on my NUC PC. In that case the HDHR will assign itself an IP of 169.254.x.x randomly on the x's. I just set up my PC port to a static IP of 169.254.0.1 with a subnet mask of 255.255.0.0. That all works, it is just the delaying function that is killing me. I guess I could do a delay on the mythtv-backend to wait for a mythtv-backend.timer to start 1 minute after boot. But who wants to introduce a race condition.
> IPv4 Link Local on the host shouldn't have an address assigned either.
> The two ends will figure their addresses out. Link Local should be an
> option if you're setting the NIC up with some tool.
> 
> I DON'T think this is the issue, but it's the right thing to do.
> 
> Try:
> 
>  hdhomerun_config 1074C841 get /tuner0/status
> 
> the above after a restart and successful MANUAL discover command.
> 
> I'd disable backend startup to test ideas that prove tuners are
> available (which is what the backend log is complaining about:
> 
>  ... Added 0 devices from 1074C841 …


I’ve not done it, so this is hearsay, but with ARP you can find the ip of a mac address

James