The images are stored on the two Raspberry Pi Zeros. The Image download station provides image download via two parallel Wifi links from the drone. The image download station is based on two GL-AR750 access points. The datatransfer itself is handled by rsync via its rsync protocoll which doesnt rely on SSH. SSH is not used as the pi zero is not fast enough to encrypt the huge data we want to transfer for each flight.

AP1

Router IP: 192.168.8.1

Admin password: ooH0Xahvat

WAN Port is Lan Port

2.4 GHz SSID: AP1 Channel 1 WIFI Password: Oag3gaeb8f TX Power: 10 dBm 300 MBit

5 GHz SSID: AP1-5G Channel 36 WIFI Password: Oag3gaeb8f TX Power: 20 dbm

AP2

Router IP: 192.168.8.200

Admin Password: ooH0Xahvat

WAN Port is Lan Port

2.4 GHz SSID: AP2 Channel 9 WIFI Password: Oag3gaeb8f TX Power: 10 dBm

5 GHz SSID: AP2-5G WIFI Password: Oag3gaeb8f Channel: 44 433MBit TX Power: 20 dbm

Configure datastorage with rsync in /etc/rsyncd.conf on ship laptop

[camimages]
path=/home/USER/camimages
hosts allow = *
list = true
uid = root
gid = root
read only = false

start rsync daemon on ship laptop

sudo systemctl start rsync

run datatransfer task on each pi ( later triggered via script @ groundcontrol pc)

rsync -avvz -u --progress -h /data/bilder/ rsync://GROUNDSTATIONIP/camimages

rsync error: error starting client-server protocol (code 5) at main.c(1675) [sender=3.1.3]

Check if folder on receiverside exists.

To get an idea whats the cause of the error - checkout rsync service status on receiverside (laptop):

sudo systemctl status rsync