veering offtopic: I always thought mDNS was an Apple thing, since Bonjour is the most extensive implementation of it (and Windows sucks at it. In fact the only way I found to get a full mDNS implementation on Windows a few years ago was to install Bonjour via an installer extracted from iTunes for Windows).

The Wikipedia page for mDNS [1] doesn't have a lot of history information, saying just that the idea of mDNS was first proposed by Bill Woodcock & Bill Manning to the IETF in 2000, and neither seem obviously tied to Microsoft. Apple later published Bonjour in 2002, and mDNS only became an official rfc6762 in 2013!

[1] https://en.wikipedia.org/wiki/Multicast_DNS

it goes like this:

1. MS uses netBios.

2. apple uses bounjour, similar to netbios, but with modern conveniences, like NAT aware.

3. windows add same niceties on top of netbios and call it LLMNR.

4. apple standardize bounjour as mDNS and open it up just because they would have to publish code because of some licenses they offended (but going into this is veering way too much offtopic on your offtopic)

5. everyone standardize on mDNS

6. RedHat (using their fake open source promotion called freedesktop, nee XDG) pushes for LLMNR for god knows why! (well, might be a reason poetering works for MS now)

7. even microsoft abandon LLMNR and netbios in favour of mDNS. everyone is using mDNS. RH/freedesktop/systemd/fwmg (all the same people) chose to base their LAN distribution service logic on LLMNR.

8. RedHat works backward compatibility of LLMNR into mDNS and things get VERY confusing. Or not. Their documentation uses the name interchangeably and honestly, at this point I am not sure of anything and I'm not paid to look at that code for over a year. I wouldn't be surprised if resolved is actually using mDNS but the setting/code is still just "called" LLMNR. /shrug.

The client uses DBUS to ask the server how many bytes were download from your LAN peers (unless you connect your device directly to the internet, then i guess i will show how many bytes ssh probes downloaded from you, inflating their numbers and making them more aggressive on the server feature)

https://github.com/hughsie/passim/blob/ae38c13da1a63fff8c8fa...

https://github.com/hughsie/passim/blob/ae38c13da1a63fff8c8fa...

also, note the quaint code to tell how much carbon it saved earth.

edit: interestingly, if you search for that data collection method name, both ddg and google only find the call from fwmgr side. the actual one, older, from passim code is not shown anywhere

https://duckduckgo.com/?q="passim_client_get_download_saving...

but it's there https://github.com/hughsie/passim/blob/ae38c13da1a63fff8c8fa...

Try `man fwupd.conf` for all the options.