Tvheadend

Hello everybody!

About a year ago I changed my setup, going from a USB tuner (directly attached to the machine running Tvheadend) to a "SAT>IP tuner" (connected via Ethernet to my local network).

A couple of times it has happened (after a crash, a restart, or other random event) that Tvheadend "lost" the connection to the (remote) tuner. It simply wasn't listed anymore under Configuration -> DVB Inputs -> TV adapters. (cf. screenshot)

When I still had the USB device connected to the machine, I knew I could remove and reattach the device itself, then check under `/dev/dvb/adapterX` whether it was available; but with the device being on the network? I have no idea how to "force" Tvheadend to look for available devices. Of course, I tried restarting the tuner; but to no avail. What I am looking for is something akin to "manually trigger a network scan for SAT>IP tuners" – does anything like this exist?

How exactly does Tvheadend scan for such devices? Is there a "timer"? Or any other mechanism I can trigger manually? I'm asking because while it usually didn't take a long while for the tuners to appear, for a couple of weeks (maybe some update broke something?) I've been waiting for many hours (20+ at times) for the devices to appear on their own. (cf. screenshot)

(Last time I spent a couple of hours debugging until I realized that at some point it just worked again without me having touched that particular system… Very frustrating! Luckily, I even have a syslog because Tvheadend was trying to record something but couldn't for lack of a free adapter – there were none available. Suddenly, at 20:49:30, the adapter "magically" appeared, was recognized by Tvheadend, was added to the list of available tuners, and suddenly the recording could be started. I have attached the syslog.)

FWIW, the setup I'm currently running with the issue is Tvheadend 4.2.9 on Ubuntu 20.04.5 LTS (focal) with a FRITZ!WLAN Repeater DVB-C.