Bug#1013437: cups: Nothing prints from driverless IPP queues unless added via lpadmin

["Gareth Evans" <donotspam@fastmail.fm>]

On Mon 27 Jun 2022, at 16:50, Gareth Evans <donotspam@fastmail.fm> wrote:
> $ avahi-browse -rt _ipp._tcp
> + wlp1s0 IPv4 Brother MFC-L2740DW series                    Internet 
> Printer     local
> Failed to resolve service 'Brother MFC-L2740DW series' of type 
> '_ipp._tcp' in domain 'local': Timeout reached
>
> $ avahi-browse -rt _uscan._tcp
> $

However that is when the laptop is connected to 5GHz wifi.
If I change to the 2.5GHz connection (same router) on which (router and frequency) the printer is connected:

$ avahi-browse -rt _ipp._tcp
+ wlp1s0 IPv4 Brother MFC-L2740DW series                    Internet Printer     local
= wlp1s0 IPv4 Brother MFC-L2740DW series                    Internet Printer     local
   hostname = [mfcl2740dw.local]
   address = [192.168.0.14]
   port = [631]
   txt = ["print_wfds=T" "UUID=e3248000-80ce-11db-8000-30055ca3d8ec" "PaperMax=legal-A4" "kind=document,envelope,label" "URF=W8,CP1,IS4-1,MT1-3-4-5-8,OB10,PQ4,RS200-300-600,V1.3,DM1" "rfo=ipp/faxout" "TBCP=F" "Transparent=T" "Binary=T" "PaperCustom=T" "Scan=T" "Fax=T" "Duplex=T" "Copies=T" "Color=F" "usb_CMD=PJL,PCL,PCLXL,URF" "usb_MDL=MFC-L2740DW series" "usb_MFG=Brother" "priority=25" "adminurl=http://mfcl2740dw.local./net/net/airprint.html"; "product=(Brother MFC-L2740DW series)" "ty=Brother MFC-L2740DW series" "note=" "rp=ipp/print" "pdl=application/octet-stream,image/urf,image/pwg-raster" "qtotal=1" "txtvers=1"]

$ avahi-browse -rt _uscan._tcp
$

Thanks
Gareth