ARP problem and temporary workaround

[emmertf]

Are you already using Valetudo?

Yes, for a long time

Your questions

Hello there,

my Dreame Z10 Pro (ver 1156 miio 4.18, 03/2022; Valetudo 2026.02.0) started having network issues a few weeks ago - it was just not reachable anymore, by any means (HTTP, SSH, ICMP). A reboot fixed it sometimes, but also always just for a while.

So I connected to the bot using UART, poked around for a bit and traced it down to an ARP issue - the bot doesn't seem to answer ARP requests anymore.

Since I don't know the bot's network internals (and don't have the time right now for a deep dive), I fixed the problem by modifying /data/_root_postboot.sh and adding this line to autostart arping in answer mode once the network comes online:

sh -c 'while [ -z "`ifconfig wlan0 | sed -n -e \"s/^.*inet\saddr:\([^\s]*\)\s.*$/\1/p\"`" ]; do sleep 1; done; arping -A -I wlan0 `ifconfig wlan0 | sed -n -e "s/^.*inet\saddr:\([^\s]*\)\s.*$/\1/p"`' &

I'm sure this can be done in a much more elegant way, but it works for now. Edit: It even seems to survive network disconnects. Which means, this should only be used with a fixed IP allocated to the bot, otherwise this might lead to connection issues for other devices in the same network!

And since I'm already here: Thank you so much for creating Valetudo!