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Try fixing wifi

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This commit is contained in:
Andras Schmelczer 2026-04-26 13:58:17 +01:00
parent 76ccefa929
commit 03bbce079b
2 changed files with 40 additions and 8 deletions
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6
README.md
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@ -10,12 +10,14 @@ sudo apt install -y python3-pip python3-pil python3-opencv python3-smbus python3
sudo swapoff -a
sudo systemctl mask swap.target
sudo systemctl disable --now bluetooth
sudo nmcli c modify netplan-wlan0-HiddenPlace 802-11-wireless.powersave 2
```
Execute `sudo crontab -e` and add
Execute `sudo crontab -e` reland add
```
@reboot /usr/sbin/iw wlan0 set power_save off
*/5 * * * * /home/andras/frame/wifi-check.sh > /home/andras/wifi.log 2>&1
*/5 * * * * /home/andras/frame/wifi-check.sh >> /home/andras/wifi.log 2>&1
```
Execute `crontab -e` and add

42
src/wifi-check.sh
View file

@ -1,8 +1,38 @@
#!/bin/bash
# Probe what actually matters (DNS to a real target) and escalate recovery
# steps until something works. `ip link down/up` alone can't unwedge the
# brcmfmac chip on the Pi Zero 2W.
if ! ping -c 1 -W 5 192.168.0.1 > /dev/null 2>&1; then
logger "WiFi check: no connectivity, restarting wlan0"
ip link set wlan0 down
sleep 2
ip link set wlan0 up
fi
CONNECTION="netplan-wlan0-HiddenPlace"
PROBE_HOST="homeassistant.example.com"
probe() {
ping -c 1 -W 5 192.168.0.1 >/dev/null 2>&1 \
&& getent hosts "$PROBE_HOST" >/dev/null 2>&1
}
probe && exit 0
logger "wifi-check: probe failed, reconnecting via nmcli"
nmcli device disconnect wlan0
sleep 2
nmcli connection up "$CONNECTION"
sleep 10
probe && exit 0
logger "wifi-check: nmcli failed, cycling rfkill"
rfkill block wifi
sleep 3
rfkill unblock wifi
sleep 15
probe && exit 0
logger "wifi-check: rfkill failed, reloading brcmfmac"
modprobe -r brcmfmac brcmutil
sleep 3
modprobe brcmfmac
sleep 20
probe && exit 0
logger "wifi-check: all recovery failed, rebooting"
/sbin/reboot