Differences

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--- tools:raspbian [2023/10/04 18:47]
darron [Problems]
+++ tools:raspbian [2024/05/16 11:52] (current)
darron [Upgrade]
@@ Line 269: / Line 269: @@
+===WiFi problems===
+==Hotplug==
+At least on one setup the WiFi fails to start during boot. It seems that the interface
+has no name as yet or is renamed to something else then renamed back to wlan0 but after
+wpa_supplicant runs which results in network failure.
+Error looks like this in syslog:
+<code>
+wpa_supplicant[434]: Successfully initialized wpa_supplicant
+wpa_supplicant[434]: Could not read interface wlan0 flags: No such device
+wpa_supplicant[434]: nl80211: Driver does not support authentication/association or connect commands
+wpa_supplicant[434]: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
+wpa_supplicant[434]: Could not read interface wlan0 flags: No such device
+wpa_supplicant[434]: rfkill: Cannot get wiphy information
+wpa_supplicant[434]: Could not read interface wlan0 flags: No such device
+wpa_supplicant[434]: WEXT: Could not set interface 'wlan0' UP
+wpa_supplicant[434]: wlan0: Failed to initialize driver interface
+</code>
+To solve this configure /etc/network/interfaces using "allow-hotplug wlan0", but
+if this also fails, replace rc.local with the following:
+<code>
+#!/bin/sh
+#
+# rc.local
+#
+# This script is executed at the end of each multiuser runlevel.
+# Make sure that the script will "exit 0" on success or any other
+# value on error.
+#
+# In order to enable or disable this script just change the execution
+# bits.
+#
+check() {
+        /sbin/ifconfig wlan0 1>/dev/null 2>/dev/null
+}
+check
+while test $? -eq 1; do
+        sleep 1
+        check
+done
+ifup wlan0
+# Print the IP address
+_IP=$(hostname -I) || true
+if [ "$_IP" ]; then
+  printf "My IP address is %s\n" "$_IP"
+fi
+exit 0
+</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 ===
@@ Line 290: / Line 374: @@
 EG.
+to bullseye from buster
 <code>
 sed -i 's/buster/bullseye/g' /etc/apt/sources.list
 </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
@@ Line 304: / Line 408: @@
 Change RPi sources list
 <code>
@@ Line 309: / Line 414: @@
 </code>
+or
+<code>
+sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list.d/raspi.list
+</code>
 Update

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