The trickiest part of the installation was getting a direct USB connection from the back of the MMI main unit rather than from the AMI connector in the glovebox. Sourcing the components to make a proper MMI/USB cable took some effort, but better late than never. Components included an old (working) after-market AMI USB cable, a yellow FAKRA HSD connector with pigtail cable 4F1035750C, green T12 connector block 8X0035447A, 3 repair wire ends, and the "detect" resistor from the non-OE AMI USB cable:
MMI/USB cable connections:
Code:
T4ap/1 (USB D+)----[USB/3] T4ap/2 (not used) T4ap/3 (USB D-)----[USB/2] T4ap/4 (GND)---------------+ T12y/3 (USB +5V)---[USB/1] | T12y/4 (USB GND)---[USB/4] | T12y/6 (Detect)---1K ohm---+
I modified the stock installFairMode.sh as an SD script to include installation of a proper resolv.conf file:
Code:
#!/bin/ksh
# 20220320 drger; DLink USB Ethernet adapter settings
# Script startup env from copie_scr.sh
showScreen ${SDLIB}/scriptStart.png
touch ${sdpath}/.started
xlogfile=${SDPATH}/run-$(getTime).log
exec > ${xlogfile} 2>&1
echo "[INFO] Start: `date`; Timestamp: $(getTime); Train: $SWTRAIN"
SOURCE=/mnt/efs-system/scripts/Connectivity
echo "[ACTI] Copying data for LAN."
mount -uw /mnt/efs-system
mount -uw /mnt/efs-persist
# Backup GSM related files:
if [ -f /etc/browser/common.cfg ]
then
echo "[ACTI] Saving /etc/browser/common.cfg"
cp -v /etc/browser/common.cfg ${SDVAR}/etc-browser-common.cfg.GSM
cp -v /etc/browser/common.cfg /etc/browser/common.cfg.GSM
fi
if [ -f /lsd/poiproducer.properties ]
then
echo "[ACTI] Saving /lsd/poiproducer.properties"
cp -v /lsd/poiproducer.properties ${SDVAR}/lsd-poiproducer.properties.GSM
cp -v /lsd/poiproducer.properties /lsd/poiproducer.properties.GSM
fi
if [ -f /lsd/MMI3G_MyAudi.properties ]
then
echo "[ACTI] Saving /lsd/MMI3G_MyAudi.properties"
cp -v /lsd/MMI3G_MyAudi.properties ${SDVAR}/lsd-MMI3G_MyAudi.properties.GSM
mv -v /lsd/MMI3G_MyAudi.properties /lsd/MMI3G_MyAudi.properties.GSM
fi
if [ -f /etc/ppp/pf.conf ]
then
echo "[ACTI] Saving /etc/ppp/pf.conf"
cp -v /etc/ppp/pf.conf ${SDVAR}/etc-ppp-pf.conf.GSM
cp -v /etc/ppp/pf.conf /etc/ppp/pf.conf.GSM
fi
echo "[INFO] LAN setup..."
echo "[ACTI] Install resolv.conf.LAN"
cp -v ${SDVAR}/resolv.conf.LAN /mnt/efs-system/scripts/Connectivity/
cp -v ${SDVAR}/resolv.conf.LAN /mnt/efs-system/etc/resolv.conf
echo "[ACTI] Patch MyAudi."
cp -v ${SOURCE}/myaudiconnect_nodataconnect.jar /lsd/myaudiconnect_nodataconnect.jar
#rm -v /lsd/MMI3G_MyAudi.properties
echo "[ACTI] Create usedhcp flag."
touch /HBpersistence/usedhcp
echo "[ACTI] Create DLinkReplacesPPP flag."
touch /HBpersistence/DLinkReplacesPPP
echo "[ACTI] Copy common.cfg."
cp -v ${SOURCE}/common.cfg /etc/browser/common.cfg
echo "[ACTI] Copy poiproducer.properties"
cp -v ${SOURCE}/poiproducer.properties /lsd/poiproducer.properties
echo "[ACTI] Copy pf.conf"
cp -v ${SOURCE}/pf.conf /etc/ppp/pf.conf
# Script cleanup:
echo "[INFO] End: `date`; Timestamp: $(getTime)"
showScreen ${SDLIB}/scriptDone.png
rm -f ${sdpath}/.started
exit 0
Putting the hardware together, we get:
Notice the green status indicator on the map display, indicating that the Google Earth client is connected and authenticated to the back-end service.
And the GEM offers confirmation, first that the MMI system recognizes the USB ethernet adapter:
and that the ethernet device gets an IP address from the Digi LTE router DHCP server:
Power to the Digi LTE router comes from a Term 75 switched circuit on Fuse Panel C/1, so it's only on with the ignition; the DHCP server is ready before the MMI system tries to get an IP address, so that should be sufficient in normal operation. We'll see how this works out in the coming summer travel months. --g
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Originally Posted by Beriant
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