Auto backup files from the Samsung NX300 camera in the background

This would not have been possible without Georg Lukas' work!

Always-On wifi

Connect the camera to the wifi the regular way (for me only 2.4ghz wifi worked to automatically connect)
Find the corresponding settings file in /mnt/ubi1/data/var/lib/connman/*/settings (note down the folder name for the connection you automatically want to connect to)

Create the wpa_supplicant.conf file in /mnt/mmc/:

nx300:/mnt/mmc# cat /tmp/wpa_supplicant.conf 
ctrl_interface=DIR=/var/run/wifi
device_name=NX300-CAMERA
manufacturer=SAMSUNG
model_name=NX300
model_number=RAE011112-00CS
serial_number=XXXXXXXXXX
config_methods=physical_display virtual_push_button keypad
country=NL

Append the following to autoexec.sh

# Always on wifi
cp /mnt/mmc/wpa_supplicant.conf /tmp/
/usr/bin/wlan.sh start NL 0x8210 >> /mnt/mmc/wifi.log 2>&1
/usr/sbin/connmand -W nl80211 -r
/usr/sbin/net-config 
sleep 2
#dbus-send --system --type=method_call --print-reply --dest=net.connman / net.connman.Manager.GetServices|grep service >> /mnt/mmc/wifi.log 2>&1 
dbus-send --system --type=method_call --print-reply --dest=net.connman /net/connman/service/wifi_a0219572b25b_7777772e6c656d6d737465722e6465_managed_psk net.connman.Service.Connect >> /mnt/mmc/wifi.log 2>&1

FTPd (started via inetd)

Make inetd start ftpd automatically by appending the following to autoexec.sh:

# Create inetd config file that activates ftpd
echo "21 stream tcp nowait root ftpd /usr/sbin/ftpd /mnt/mmc/DCIM/" > /mnt/mmc/inetd.conf
# start inetd (in background) that spawns ftpd on demand
/usr/sbin/inetd /mnt/mmc/inetd.conf

On a remote host periodically poll (less elegant) for new files (if the camera is on-line). The second line purges the mirrored files from the camera so that they do not get downloaded again if deleted from the backup:

while true; do sleep 5 && ping -q -c 3 nx300 > /dev/null && wget -q -m ftp://nx300/ ; done
#(sleep 1; echo -e "cd /mnt/mmc/DCIM/100Photo/ && rm SAM_0158.JPG SAM_0159.JPG";) | nc -q 5 nx300 23

If you additionally want to only mirror files that are newer than a sentinel file (e.g. because you might want to be allowed to delete files locally without re-mirroring the file again), run:

#!/bin/bash
##
## Mirrors files from the nx300 samsung camera to the local machine. The set of files mirrored is the subset of files newer than the given sentinel.
##
## License see http://unlicense.org/
##

## mirrorers the files from the camera stored in the 100PHOTO/ folder int the local 100PHOTO/ folder
lftp nx300 -e "set ftp:use-feat off; mirror --newer-than=100PHOTO/.sentinel 100PHOTO 100PHOTO; quit"

## Keep the last (newest) mirrored file at a sentinel.
## (Do not just store the name of the file because the original file can be touched (e.g. modified by an image editing program) on the local end
cp -a 100PHOTO/`ls -tp 100PHOTO/ | grep -v /$ | head -1` 100PHOTO/.sentinel

However, I have found that ftpd/lftpd do not correctly preserve the ctime/mtime/... when transfering the file. Thus, the sentinal approach does not work reliably.

inotifywait

Download following squeeze (oldstable) armel deb packages from packages.debian.org:
https://packages.debian.org/squeeze/libinotifytools0
https://packages.debian.org/squeeze/inotify-tools
Extract the data bits of both .deb files with 'ar p notify data.tar.gz | tar zx' and flatten libinotifytools.so.0, libinotifytools.so.0.4.1 inotifywait and inotifywatch from the resulting usr/* to /mnt/mmc

Start /mnt/mmc/mirror.sh via /mnt/mmc/autoexec.sh

#!/bin/sh

## make sure to find libinotify in current directory            
LD_LIBRARY_PATH=/mnt/mmc/:$LD_LIBRARY_PATH

## directory to watch for images
DIR=/mnt/mmc/DCIM/100PHOTO

## target to ftpput files to
TARGET=strawberry

## watch for new files and immediately copy to remote and delete afterwards
while F=$(/mnt/mmc/inotifywait -e create $DIR --format %f .)
   do ( ftpput $TARGET /incoming/$F $DIR/$F && rm $DIR/$F ) &
done

Install vsftpd on a raspberry pi
- apt-get install vsftpd && mkdir -p /var/ftp/incoming && chown root:root /var/ftp && chown ftp:ftp /var/ftp/incoming
- Add anon_upload_enable=YES, write_enable=YES, anonymous_enable=YES, anon_root=/var/ftp and anon_umask=022 to /etc/vsftpd and restart vsftpd

The final autoexe.sh looks like:

#!/bin/sh

TARGET=strawberry

mkdir -p /dev/pts
mount -t devpts none /dev/pts

# Start telnet server
telnetd -l /bin/bash -F > /mnt/mmc/telnetd.log 2>&1 &

# Create inetd config file that activates ftpd
echo "21 stream tcp nowait root ftpd /usr/sbin/ftpd /mnt/mmc/DCIM/" > /mnt/mmc/inetd.conf

# start inetd (in background) that spawns ftpd on demand
/usr/sbin/inetd /mnt/mmc/inetd.conf

# automatically start wifi
cp /mnt/mmc/wpa_supplicant.conf /tmp/
/usr/bin/wlan.sh start NL 0x8210
/usr/sbin/connmand -W nl80211 -r
/usr/sbin/net-config
sleep 2
dbus-send --system --type=method_call --print-reply --dest=net.connman /net/connman/service/wifi_a0219572b25b_7777772e6c656d6d737465722e6465_managed_psk net.connman.Service.Connect

# start mirror.sh
# (TODO: inline the mirror.sh script?)
/mnt/mmc/mirror.sh > /mnt/mmc/mirror.log & 2>&1

# copy any file the mirror.sh script might have missed in previous runs
for f in /mnt/mmc/DCIM/100PHOTO/*.JPG; do file=`basename $f` && ftpput $TARGET incoming/$file $f && rm $f; done

Auto backup files from the Samsung NX300 camera in the background

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