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tools:raspbian [2023/10/04 20:33] – [WiFi problems] darrontools:raspbian [2024/05/16 11:52] (current) – [Upgrade] darron
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 ===WiFi problems=== ===WiFi problems===
 +
 +==Hotplug==
  
 At least on one setup the WiFi fails to start during boot. It seems that the interface At least on one setup the WiFi fails to start during boot. It seems that the interface
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 </code> </code>
  
 +==Keep alive==
 +
 +Pi4 WiFi can both disconnect with wpa_supplicant still running or crash.
 +
 +In the former case we can reconnect but in the latter a reboot is required.
 +
 +<code>
 +#! /bin/bash
 +
 +check() {
 +        LOSS=`ping -c 3 -i 1 192.168.0.1 | awk 'match($0, /[0-9]+%/) { print substr($0, RSTART, RLENGTH) }'`
 +}
 +while test 1; do
 +        sleep 30
 +        check
 +        if test "$LOSS" = "100%"; then
 +                ifdown wlan0 1>/dev/mull 2>/dev/null
 +                ifup   wlan0 1>/dev/null 2>/dev/null
 +                sleep 5
 +                check
 +                if test "$LOSS" = "100%"; then
 +                        reboot
 +                fi
 +        fi
 +done
 +</code>
 +
 +Change the IP address to that of your access point or modem.
 === Upgrade === === Upgrade ===
  
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 EG. EG.
 +
 +to bullseye from buster
  
 <code> <code>
 sed -i 's/buster/bullseye/g' /etc/apt/sources.list sed -i 's/buster/bullseye/g' /etc/apt/sources.list
 </code> </code>
 +
 +or edit for from bullseye to bookworm
 +<code>
 +deb http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware
 +deb http://deb.debian.org/debian-security/ bookworm-security main contrib non-free non-free-firmware
 +deb http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware
 +</code>
 +
 +If keys need importing (if import fails try again, and again)
 +
 +<code>
 +apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0E98404D386FA1D9
 +apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 6ED0E7B82643E131
 +apt-key adv --recv-keys --keyserver keyserver.ubuntu.com F8D2585B8783D481
 +apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 54404762BBB6E853
 +apt-key adv --recv-keys --keyserver keyserver.ubuntu.com BDE6D2B9216EC7A8
 +</code>
 +
  
 Update Update
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 Change RPi sources list Change RPi sources list
 +
  
 <code> <code>
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 </code> </code>
  
 +or
 +
 +<code>
 +sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list.d/raspi.list
 +</code>
 Update Update