Hi,
I have had recent problems with a SqueezeBoxRadio that had been 100%
reliable on a wifi link for several years and then suddenly started
disconnecting and required either network repair, and more often reboot
to get connectivity up again. I assumed it must have been new wifi
interference out of my control. If I placed the unit directly in front
of my AP. It did not happen, but when I placed it back into the position
I wanted it (at some distance) it started with disconnects.
I noticed others in related posts had similar issues. So I worked on
this a little. Hope someone else might find this useful....
During investigations, I tried with little success to use ssh on the
client while this was happening and even tried saving logs to another
file to try and capture what was occurring. It all proved ineffective.
So finally I attached to the serial interface on the SqueezeBoxRadio and
waited for disconnect.
It seems that when these disconnects occur it is not possible to simply
restart the IP layer or for that matter the wpa_supplicant. Both are
dependent on the the atheros wireless driver. This seems to have a bug
that places it into a uni-directional state. Traffic out from the IP
layer but responses do not make it to the host.
Therefore to avoid debugging the wireless code ???? I came up with a
work around:
Essentially a simple ping based bidirectional forwarding detection
mechanism, that regularly pings the squeeze server according to the info
in the server config file, and if pings fail, it unloads the entire
atheros driver, reloads again aquires a new IP and actually the higher
layer (Squeezeplay) rides this out and the connection loss is invisible
to the user application.
Nasty but effective. To kick off the script I modified
/etc/network/udhcpc_action. This now starts an instance of my BFD.sh
script every time a dhcp lease is acquired. It also looks for an
instance of the script BFD.sh pid file, to ensure it does not attempt to
start multiple instances each time a dhcp renew occurs. The BFD.sh
script does a simple job of cleaning up its own pid files and runs
continuously until a disconnect occurs. It then reloads the driver
modules and then exits, waits for dhcp to acquire an IP address and is
then restarted by udhcpc_action, only when IP connectivity should be
re-established.
/etc/network/BFD.sh
Code:
--------------------
#!/bin/sh
loop="true"
if test -f "/var/run/BFD.pid"; then
for pr_num in $(pidof BFD.sh); do
if [ $pr_num != $$ ]; then
kill -9 $pr_num
fi
done
rm /var/run/BFD.pid
fi
/usr/bin/logger "BFD Daemon started with PID: "$$
echo $$ > /var/run/BFD.pid
server=$(awk -F"serverInit=" '{print $2}'
/etc/squeezeplay/userpath/settings/Playback.lua | awk -F"," '{print $2}' | cut
-d '"' -f2)
while [ $loop == "true" ]
do
ping -W 1 -w 10 -c 5 $server > /dev/null
if [ $? -ne 0 ]; then
/usr/bin/logger "Ping Bidirectional Forwarding Detection failed:
Restarting wlan."
/etc/init.d/wlan stop
sleep 2
/etc/init.d/wlan start
rm /var/run/BFD.pid
udhcpc -R -a -p /var/run/udhcpc.eth1.pid -b --syslog -i eth1 -H
SqueezeboxRadio -s /etc/network/udhcpc_action
#dropbear -i
loop="false"
else
loop="true"
fi
sleep 5
done
--------------------
modified /etc/network/udhcpc_action
Code:
--------------------
#!/bin/sh
# udhcpc script edited by Tim Riker <[email protected]>
# zcip integration idea from here:
http://osdir.com/ml/network.zeroconf.workers/2005-06/msg00000.html
[ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1
RESOLV_CONF="/etc/resolv.conf"
[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet"
/usr/bin/logger "udhcpc_action $interface $1 ip=$ip"
case "$1" in
deconfig)
killall zcip > /dev/null
/sbin/ifconfig $interface 0.0.0.0
;;
fail|leasefail)
killall zcip > /dev/null
# -v is needed to work around a bug in zcip - probably fixed in newer version
/sbin/zcip -v $interface /etc/network/zcip_action > /dev/null &
;;
renew|bound|zeroconf)
killall zcip > /dev/null
/sbin/ifconfig $interface $ip $BROADCAST $NETMASK
while route del default gw 0.0.0.0 dev $interface ; do
:
done
if [ -n "$router" ] ; then
metric=0
for i in $router ; do
route add default gw $i dev $interface metric
$metric
metric=$metric+1
done
else
route add default dev $interface
fi
echo -n > $RESOLV_CONF
[ -n "$domain" ] && echo search $domain >> $RESOLV_CONF
for i in $dns ; do
echo adding dns $i
echo nameserver $i >> $RESOLV_CONF
done
if [ ! -f "/var/run/BFD.pid" ]; then
(/etc/network/BFD.sh &) &
fi
;;
esac
exit 0
--------------------
------------------------------------------------------------------------
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View this thread: http://forums.slimdevices.com/showthread.php?t=115124
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