1. MQTT Is a Communication Model, Not a Feature

A common mistake is to think of MQTT as a “lighter HTTP.”

That assumption bre...

TL;DR

• close(ch) is a one-time state transition: open → closed
• Closing a channel ...

I recently spent some focused time reading PostgreSQL’s concurrency and locking documentation, and then mapping that understanding to how locks actually work in Spring JPA / Hibernate.

T...

Needed to share my local dev server externally. LocalTunnel made it instant.

Had Bluetooth audio dropouts with my Sony speaker. Switching from AAC to SBC fixed it.

Switched Emacs Org mode LaTeX previews from ImageMagick to dvisvgm. Much sharper results.

Had a weird Docker issue today. Image built successfully but ran old code. Turned out to be stale cache layers.

Switched to Rime for Chinese input on Arch Linux. Here’s my setup with the rime-ice dictionary.