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Welcome to the 27th issue of TMPDIR Weekly, a newsletter covering Embedded Linux, IoT systems, and technology in general. Please pass it on to anyone else you think might be interested and send any tips or feedback to our forum or

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Yoe 2022.02 was released with many interesting changes. It includes inclusive language changes across multiple layers especially in core and meta-openembedded and upgrades toolchain components to major new releases:

  • Clang 14.0.0 release candidate
  • Glibc 2.35
  • Binutils 2.38
  • GDB 11.2
  • Go - 1.17.7

All layers are primarily using kirkstone (3.5) yocto project ready branches. This is first Yoe release of 2022!

QT company opensources 5.15.3 LTS release after almost 2 years. The meta-qt5 layer, which provides QT5 for Yocto/Openembedded projects, is currently using 5.15.2 release. It would be interesting to upgrade to 5.15.3 for Yoe Distro as well, since the yoe-qt5-image reference image is based on QT5


Ongoing work continues in Simple IoT to support a duplicate node feature and better understand node lifecycle issues ADR-3. They are related as the duplicate features has the potential to create a large number of nodes quickly if the duplicated node has a lot of descendants.

The new Simple IoT documentation site has been deployed using mdBook -- it is working great! Will have more user documentation updates soon after the duplicate feature is finished.


Trying Julia in a Pluto notebook to run calculations for a circuit design. Initial impressions are positive -- seems to be well suited for the task. While reviewing the language, I've noted a number of interesting features of the language.

If you are looking for a simple personal/small business email server alternative to Postfix, check out Maddy. Maddy is a single binary mail server written Go that has support for all the standard stuff like SMTP, IMAP, TLS, DKIM, etc -- initial experiences are good.

Quote for the week

“Good design adds value faster than it adds cost.”

  • Thomas C. Gale

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Thanks for reading!

Khem and Cliff