Its always DNS: Why the default BIND setup is failing to resolve

Broken serial port To start the experiment I decided to start with the soldering serial port on the router. That was a bad surprise, none of my UART TTL adapters have been able to get any output from it. Led on the UART was blinking but nothing was on the terminal. I tried with 3 different UART/TTL to USB adapters with the same outcome, and as the loop test was passing just fine it was clear that the problem is with board hardware. So I decided to give it a last chance with a cheap USB Logic analyzer and PulseView as a UART decoder. Surprisingly it was working! Using 500Khz sample rate and default (115200/8N1) decoder settings I was able to read from the port.

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Excerpt limited to ~120 words for fair-use compliance. The full article is at smallhacks.