Re: Forward LIRC from one machine to another via UDP over the network?

[Sean Y. <se...@me...>]

On Sun, Jun 08, 2025 at 06:56:39AM -0400, Paul Fox wrote:
> sean wrote:
>  > On Sat, May 31, 2025 at 06:51:00PM -0400, Paul Fox wrote:
>  > > patrick wrote:
>  > >  >    I cobbled together this command on the RPi, hoping it would send the IR
>  > >  >    signals to the MythTV computer in the same way the HDHR did but it doesn't
>  > >  >    seem to be working.  I'm running irw on the 192.168.1.2 computer but it's
>  > >  >    not receiving any signals.
>  > >  > 
>  > >  >    /usr/bin/mode2 -d /dev/lirc0 | irtext2udp | socat -
>  > >  >    udp-datagram:[1]192.168.1.2:5000,broadcast
>  > >  > 
>  > >  >    I'm hoping someone else has done this or has experience with it and could
>  > >  >    offer me some assistance please.
>  > > 
>  > > Unless something has changed recently (and I doubt it), irtext2udp
>  > > is broken, because it matches the documentation of the UDP protocol, which
>  > > is also broken.  I submitted patches for these issues in March 2022:
>  > >     https://sourceforge.net/p/lirc/tickets/370/
>  > > I also sent mail to the (this) list about it at the same time -- I'm sure
>  > > it's in the archives.  So that's probably at least part of your problem.
>  > 
>  > I've applied a fix. I think it's easier to simply fix plugins/udp.c rather
>  > than making everything compatible with something that is clearly a bug.
>  > 
> 
> No, I don't think you can do that.  You're changing an existing
> protocol.  There is code out in the wild that's decades old at this
> point, which depends on the current behavior.  (I know, I wrote some:
> https://sourceforge.net/projects/airboard-ir/ )
> 
> If your patch were the right thing, I would have submitted it initially.
> 
> As it stands now, as soon as a new release a lirc makes it's way to
> debian, half the devices in my house, and likely other peoples', will
> stop working.

The lirc source tree contains two implementations of the udp protocol, one
uses high bit set for pulse, the other space. The documentation says high
bit set for pulse, and this also makes more sense. One or the other has to
fixed.


Sean