Lessons Learned After Finally Configuring a Raspberry Pi CM4 Mini Router (Bought in 2022) Product Mini Router built with Raspberry Pi Compute Module 4 Dual Gigabit Ethernet NICs 4GB RAM / 32GB eMMC Pre-installed OpenWrt Compact form factor, fanless, low power Background: A Device That Waited Its Turn I bought this device back in 2022 . At the time, it looked like the perfect small router: Raspberry Pi Compute Module 4 Dual Ethernet ports OpenWrt already installed No SD card required thanks to eMMC But like many homelab projects, it ended up sitting on a shelf . Fast forward to today — with more networking experience, a clearer home network plan, and a real need for a flexible router — I finally decided to configure it properly. That’s when the real journey started. What I Expected (Even in 2025) Even knowing this wasn’t a consumer router, I still expected: Plug WAN into my upstream router Plug LAN into my laptop Access 192.168.1.1 Hav...
Last night one friend of my calls me to help him with the application they use at the school he works. He wanted to have the final grades less than 70 with red color. It's only a one java-script function he tells me. And it's true. But there is a hidden story in that simple java-script function. First of all. I start checking that the table is a generated table. No problem with this. But then i noticed something funny all the rows have the same ID. WTF was my first impression. <TD class=xl30 id="table1">{rc_ClassAvg1} </TD> <TD class=xl30>> </TD> <TD class=xl30 id="table2">>{rc_ClassAvg2} </TD> <TD class=xl30> </TD> <TD class=xl30 id="table3">{rc_ClassAvg3} </TD> rc_ClassAvg1 generates the code for all the grades, and all the rows it generates come with id=table1. So my simple java-script file had to deal with repeated rows with the same idea. ...