WirelessMoves

I recently bought a new printer and I’m currently looking a bit into how printers are detected and how page data is sent to the printer. Why? Just out of interest and to understand how modern printing works over the local network. I have three HP manufactured printers at home, but I would also like to understand the type of document formats printers of other manufacturers understand. So if you are running Linux and have a printer in the local network (not connected via USB), would you mind to look up the document format capabilities of your printer and let me know? On the shell this is quite easy:

# Detect all printers in the local network
#
$ ippfind -l

ipp://YYYYYYYYYY:631/ipp/print idle accepting-jobs none

# YYYYYYYYY is the IP address or domain name of the printer
#
$ ipptool -tv ipp://YYYYYYYYYYYY:631/ipp/print get-printer-attributes.test | grep "document-format\|printer-make-and-model"        

The ipptool command then returns the model name and document formats supported. I’d be very grateful if you could post the result in the comments below. Many thanks in advance!

And to give you an idea how this looks like, here’s the output returned by my new printer:

printer-make-and-model (textWithoutLanguage) = HP Smart Tank 7300 series
        
document-format-default (mimeMediaType) = application/octet-stream

document-format-supported (1setOf mimeMediaType) = application/vnd.hp-PCL,image/jpeg,image/urf,image/pwg-raster,application/PCLm,application/octet-stream

document-format-version-supported (1setOf textWithoutLanguage) = PCL3GUI,PCL3,PJL,Automatic,JPEG,AppleRaster,PWGRaster,PCLM

document-format-details-default (collection) = {document-format=application/octet-stream}

document-format-varying-attributes (1setOf keyword) = copies,hp-color-working-spaces-supported

Yes, I know, I am a few years late with this but it is very likely that for the next desktop iteration of the notebooks in the family, Wayland is going to be the display compositor. The X-Server is on the way out. I don’t really mind as long as I have the features I require. One of those features which are a bit special is that one member of the household requires special French characters to be mapped on a German keyboard layout to Alt-Gr + one normal key. Particularly: ‘ç ï ë œ ÿ’. Yes, it’s the keyboard and not the display, but the X-Server and Wayland handle the keyboard, too. Unfortunately, the solution I have for X-Server environments doesn’t work with Wayland anymore. So I had to find a new way.

Continue reading Wayland and Remapping Characters on the Keyboard

A bit of a special topic today, but I wasn’t aware about this before: For small files and videos, my XMPP server uses HTTPS and a local file storage at the server side to store and forward files. The file size limit is configurable and by default 20 MB. This suffices for 99% of my use cases. However, what about larger files, e.g. videos?

Continue reading XMPP Large File Transfers via STUN/TURN

Like everyone else I do have technical debt or stumble over things when changing my infrastructure that I didn’t see coming. Recently, it hit me when I wanted to change the physical location of one of my Prosdy XMPP servers I use for personal communication. Getting the XMPP server VM to a bare metal host at another physical site was done in a few minutes and at first I thought my plan worked nicely. The warm feeling didn’t last very long, however.

Continue reading DNS SRV Records to the Rescue

For years, I’ve been using several workspaces, i.e. virtual desktops to distribute different kinds of work to different virtual desktops and then changing quickly between them with the mouse or keyboard shortcuts. While this was working, I always felt a bit hampered by the dock on the left side always showing dots for all open windows next to their icons, even if those windows were on different desktops. It thus happened quite a lot that I inadvertently changed between desktops because I thought a window was open on one workspace when it was actually open in another. Recently, I got a bit fed up and I wondered if there wasn’t a hack to only get dots in the dash next to the app icons for windows open in the current workspace. It turns out that no hack is required, one can switch to ‘Include applications from the current workspace only’ in the ‘Multitasking’ section of the system settings. Works great in Ubuntu 22.04 and also 24.04! I can’t believe I didn’t find this earlier. For me, this is a huge productivity gain and it just requires clicking on single radio button!

And a quick follow up to a previous post on using Nextcloud ‘external’ storage on another host over an SMB network mount: SMB / CIFS seems to have been a bit ‘insecure’ in the past, so using it over the Internet was not recommended. However, recent versions of SMB, particularly version 3, seems to have the necessary authentication and encryption features to make this feasible. I was curious of course so I decided to run a tcpdump on my Nextcloud machine to see how the traffic to my SMB server looks like.

Continue reading Nextcloud and a Quick SMB Trace

Two years ago, I switched from editing documents I store on my Nextcloud with Collabora (Libreoffice) Online to OnlyOffice Online. The main reason: The self-hosted Collabora/Libreoffice Online server renders changes made in documents on the server side and then downloads the result into the browser. The unfortunate consequence: There was a noticeable delay between typing something and characters appearing on the screen if one is not close to the server.

Also, I had some problems with characters sometimes not appearing in the order I had typed them. And finally, I sometimes got drawing errors where parts of a line were missing. All of this together made me set-up my own OnlyOffice document server and connect it to Nextcloud. I’ve been using this setup for 2 years now and it suffers from none of these issues, as the document to edit is loaded into the browser and rendered locally. Changes made to the document locally are then sent to the server and from there to other people editing a document collaboratively. From my point of view a much better architecture. But it’s two years down the road now, perhaps Collabora Online has become better!? I decided to take a look.

Continue reading Revisiting Collabora Online with Nextcloud – 2 Years Later

Last year, I analyzed why some of my backup hard disks had become so slow. It turned out that this was due to Shingled Magnetic Recording (SMR). In particular, a number of my 8 TB 3.5″ disk drives were using this recording technology and as they were becoming full anyway, I took them out of service and replaced them with larger drives that do not use SMR. However, these drives were still pretty much new, so I decided to put them into good use for a scenario in which speed does not matter that much: Background backups with Borg backup of virtual machine images that are streamed over the network and hence are slow to be backed up anyway.

Continue reading Pruning Days: Borg Backup Cleanup

For another post to be published soon, I had set-up a Nextcloud instance to play around with Collabora Online. Before tearing down the setup again, I decided to re-use it for another experiment: How does attaching and using ‘external’ storage to Nextcloud work!?

Continue reading Nextcloud with ‘External’ Storage

When it comes to roaming in Europe as an EU citizen, there is one sore spot on the continent: Switzerland. As the country is not part of the union, EU roaming does not apply to it and it depends on your prepaid or postpaid contract if voice and data roaming while being in Switzerland is included. While my German network operator of choice has always included Switzerland in EU roaming, a lot of other German network operators and MVNOs have not. Also, the French network operator of choice of a member of our household did not have it in the contract for many years, either. But fortunately, things have changed quite a bit this year.

Continue reading The Switzerland Roaming Problem (Almost) Solved