WirelessMoves

Recently, I had a look at a number of frameworks to push notification messages to my mobile device based on trigger events of my cloud at home. Think of getting a notification when a service starts misbehaving or crashing, disk drives about to become full, backups finished, etc. So far I’ve used emails and XMPP messages for the purpose. While that works great it doesn’t really fit the purpose. So I was looking for something else and discovered Gotify, ‘a simple server for sending and receiving messages’.

Installation is super easy and I was up and running in just a few minutes. Also, pushing messages from the shell or in programs written in Python and other languages just requires a single line of code. On the wire, HTTP push and Websockets are used and TLS encryption with Letsencrypt certificates are thrown in for good measure. Nice! When I had a look at the traffic to and from my mobile device to the Gotify app, however, I was a bit surprised, to say the least.

Continue reading Improving The Keep Alive Behavior of Gotify

For today, I have a screenshot of two bandwidth graphs of a recent working day at home which shows the different applications I use Internet connectivity for. As in the previous blog entries on the topic both graphs show the same timeframe. While the bottom graph shows the complete downlink channel bandwidth of 100 Mbit/s in the downlink direction and 36 Mbit/s in the uplink direction, the upper graph is capped at 10 Mbit/s to show things in more detail.

Continue reading Bandwidth Graph of a Working Day At Home

Like so many other events recently, the Vintage Computing Festival Berlin (VCFB) will hold its annual event in the virtual domain this year. Other retro computing events have already taken place online in 2020 and I very much enjoyed to join events I could not have gone in person. However, all of them have focused on talks while the exhibition of retro computing equipment was unfortunately ditched. At the online VCFB this year, we attempt to do things a bit differently.

Continue reading Vintage Computing Festival Berlin – 10. – 11. October 2020

After the introduction of my network statistics data collection system in the previous post I can now analyze my line usage over time in detail. Here’s a screenshot that shows a number of overlapping data flows.

Continue reading Up- and Downlink Streams On My DSL Line

One thing I wanted to have for a long time was a better visibility of how my DSL line at home is utilized over time. My Fritzbox router has some basic functions for this such as showing the uplink and downlink utilization of the past few minutes and a daily, weekly and monthly traffic counter. That’s a start but the amount of information is limited and so are the conclusions that can be drawn from it.

Beyond these features, however, the Fritzbox has a number of counters that are updated every few seconds which can be queried over the network. Sounds promising! Together with the Grafana visualization suite that I also wanted to have a closer look at for quite some time now, it made for an interesting project. So I started searching a bit and found out that a number of other people have been at this point before as well and have put together a complete data collection and visualization front-end for the information provided by the Fritzbox. Perfect, exactly what I was looking for!

Continue reading Fritzbox Monitoring with Grafana

Not meeting in person but in online meetings these days has the advantage, or disadvantage, you decide for yourself, that you can also participate while on the road. While I try to avoid this as much as possible as I prefer a bigger screen and a quiet environment for meetings, the only alternative sometimes is not to participate at all. Surprisingly I found that conference calls while on the road work better than I anticipated at first.

Continue reading Online Meetings On The Road – Some Thoughts

In recent months, more and more web sites greet me with super annoying pop-ups and request my consent to their use of cookies. Some even give me the option to control for which purposes cookies are used. Of course, web site owners don’t do this for fun but because of laws such as the GDPR that have come into effect in recent years. While I think that the GDPR is a good thing overall, I am particularly unhappy about this side effect.

Continue reading Annoying Cookie Consent – But…

We’ve had a visitor at our place recently for a couple of days who used a video streaming service quite a lot. When I had a look at our Internet connection usage statistics, I was quite surprised how differently the service behaved when it came to resource usage compared to the video streaming provider we use in the family. Yes, we only use one! Perhaps a generational thing. Anyway, when I had a closer look at the datarates of the two streaming services I was quite surprised that there is a 10:1 difference.

Continue reading Comparing Two Streaming Data Rates In Practice

In 1999, Tim Berners-Lee, together with Mark Fischetti, wrote ‘Weaving the Web‘, a book on how he invented the World Wide Web in the late 1980s and the early 1990’s. It is still published today so it’s not difficult to get hold of it. You can also lend a copy in PDF format from OpenLibrary.org. Written less than a decade after the web had its early break through, it is now two decades old itself and offers incredible insight into the early days, the thoughts of the time how it should evolve and it made me reflect on how it turned out today.

Continue reading Book Review – Weaving the Web

And in this final part of my mini-series on disk and SSD passwords that require interaction over the ATA protocol I’d quickly like to say a few words about another interesting feature that I have previously missed: Securely erasing a device.

Continue reading Deleting An SSD With ATA Security Erase