https://raymii.org/s/tags/serial.xml RSS feed for tag serial on Raymii.org https://raymii.org/s/articles/All_packages_that_were_present_in_Ubuntu_18.04_but_removed_in_20.04.html?utm_medium=rss&utm_source=raymii&utm_campaign=tagrss https://raymii.org/s/articles/All_packages_that_were_present_in_Ubuntu_18.04_but_removed_in_20.04.html Otherwise titled `Figure out the differences between two apt repositories`. Recently I've had a few packages that I often use but were missing from Ubuntu 20.04 LTS. One is [ckermit](/s/blog/Ive_packaged_up_CKermit_as_a_snap_for_Ubuntu_20.04.html) and the other is [gnash](/s/blog/Ive_packaged_up_Gnash_as_a_Snap_for_modern_linux.html), both of which I 'converted' to a snap. (In air quotes because I just converted the 18.04 deb). This made me wonder if I could figure out a list of that are present in Ubuntu 18.04, but absent in Ubuntu 20.04. As `apt` and `dpkg` are standardized tools and and package formats, we can use a few shell tools to parse the package lists and compare them side by side. This post shows you how to do the comparison yourself and I discuss the removed packages a bit. Some are version increments (like `gcc-6` in Ubuntu 18.04 but `gcc-7`in Ubuntu 20.04), and some are packages that were combined into one instead of split up (like `ltsp` in Ubuntu 20.04 but a bunch of seperate `ltsp-$postfix` packages instead in Ubuntu 18.04). Many others are just replaced by newer versions (`python-ceph` vs `python3-ceph`). The list of differences is provided as a download, both ways. Wed, 19 May 2021 00:00:00 GMT Wed, 19 May 2021 00:00:00 GMT https://raymii.org/s/blog/Ive_packaged_up_CKermit_as_a_snap_for_Ubuntu_20.04.html?utm_medium=rss&utm_source=raymii&utm_campaign=tagrss https://raymii.org/s/blog/Ive_packaged_up_CKermit_as_a_snap_for_Ubuntu_20.04.html Last year I packaged up [gnash as a snap](/s/blog/Ive_packaged_up_Gnash_as_a_Snap_for_modern_linux.html) because it was missing from the Ubuntu 20.04 apt repositories. Recently I found out that `ckermit` is also not in Ubuntu 20.04, as far as I can tell because it wasn't in the Debian repositories when the Ubuntu 20.04 initial sync happened. Which is very inconvenient for an LTS release. I often use `ckermit` to connect to our hardware via a script, to automatically boot from NFS (via u-boot). I could do that manually via `screen` or `minicom`, but I have a `kermit` script that does it for me, which is very convenient. Since the snapping of `gnash` was so easy, I decided to do it for `ckermit` as well, since I now know how to convert deb packages to snaps. I also have a few colleagues who also use those kermit scripts and are going to update to 20.04 in the (near) future. The snap packaging is based on work by Phil Roche, he wrote about re-packaging older debian packages with an Ubuntu 18.04/16.04 base layer as a snap. My `ckermit` package is confined (no `--classic` needed), the source code for the snap is on my github and on any snap-enabled distro you can now 'snap install ckermit-raymii' to enjoy CKermit. Sun, 16 May 2021 00:00:00 GMT Sun, 16 May 2021 00:00:00 GMT https://raymii.org/s/blog/Get_serial_port_data_on_the_web_with_live_updating.html?utm_medium=rss&utm_source=raymii&utm_campaign=tagrss https://raymii.org/s/blog/Get_serial_port_data_on_the_web_with_live_updating.html Recently I was asked to build a test setup to measure the accuracy of a few loadcells (weight sensors) in a frame. Someone other than me would execute the test and required access to the measured data, preferably live and without needing knowledge of ssh or linux. The weight sensors can be read with an openscale board from sparkfun via a serial connection which the board emulates over USB (via an FTDI chip), via that same serial connection you can also calibrate them or change settings like amount of decimals. As a quick solution I created a webpage that uses a small amount of javascript to live update the readings from the board. screen is used to capture the output of the serial connection to a file which the webpage displays and updates. In this article I'll talk about how I put various bits of software together to get the output of the serial connection onto a nice webpage with live updating. Sat, 28 Sep 2019 00:00:00 GMT Sat, 28 Sep 2019 00:00:00 GMT