image-download-station [Digitale Elektronik und Technische Informatik]

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===== Image Download station =====

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 [[https://www.gl-inet.com/products/gl-ar750/|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.

===== Access points =====

WIFI password: adakfd4bm

=== AP1 ===

This is the main router which provides DHCP service.

Router IP: 192.168.8.1


WAN Port is Lan Port 

2.4 GHz SSID: SW-AP1
Channel 1
TX Power: 10 dBm
300 MBit

5 GHz SSID: SW-AP1-5G
Channel 36
TX Power: 20 dbm

=== AP2 ===

This router is connected with the WAN port to a LAN port of AP1. 

Router IP: 192.168.8.2

WAN Port is Lan Port 

2.4 GHz SSID: SW-AP2
Channel 11
TX Power: 10 dBm

5 GHz SSID: SW-AP2-5G
Channel: 44
433MBit
TX Power: 20 dbm 

=====  Laptop setup =====

General setup for Hardware, OS, eduroam access, crrcsim e.t.c. is in the [[groundstation|Laptop description.]]

==== rsync ====

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

Each flight should have a unique named folder and needs two subfolders to be configured. 
e.g.

<code>
[ringo-05032020_0915h-cam-r]
path=/home/USER/flightdata/ringo-05032020_0915h/cam-r
hosts allow = *
list = true
uid = root
gid = root
read only = false

[ringo-05032020_0915h-cam-l]
path=/home/USER/flightdata/ringo-05032020_0915h/cam-l
hosts allow = *
list = true
uid = root
gid = root
read only = false
</code>

__**IMPORTANT** You have to name your folders ''cam-r'' and ''cam-l'' as this encoding is needed for the searchwing-gui to work in correct manner **IMPORTANT**__


start rsync daemon on ship laptop

  sudo systemctl start rsync
  
  

=== transfer images ===

run datatransfer task on each pi ( later triggered via script @ groundcontrol pc): e.g.

  rsync -auv --progress /data/bilder/ rsync://GROUNDSTATIONIP/ringo-05032020_0915h-cam-r

  * Don't use the -z option which compresses the data. The images are already compressed and the CPU load will result in 1 MB/s transfer rate compared to 3-4 MB/s without the -z option. (Beck, 23.2.20)
  * If you like to transfer and delete the images from the pi, use the --remove-source-files option.


=== troubleshooting ===

  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



==== searchwing-gui ====

To install and use the GUI please read the UPTODATE README in https://gitlab.com/searchwing/development/searchwing-gui or on the local repo on the laptop.

=== config ===

  * Set your flight image data folder in ''/backend/config.js'' : ''datadir: '/absolute/path/to/data/dir'''
  * Set your camera left and right prefix folder names in ''/backend/config.js'' : ''left: 'cam-l', right: 'cam-r'''

=== Import Data ===

  * For each flight create a folder with a reasonable name : e.g. ''/datadir/ringo-05032020_0915h''
  * For each flight create subfolders for the data from each camera : e.g. ''/datadir/ringo-05032020_0915h/cam-l'' & ''/datadir/ringo-05032020_0915h/cam-r''
  * Copy / RSYNC your image data to these folders by using the procedure described in the section RSYNC

=== visualize images ===

 * Run backend

<code>
bash
cd backend
npm install
node index.js
</code>

 * Run frontend

<code>
bash
cd frontend
npm install
npm start
</code>

  * Go to http://localhost:3000

==== searchwing-pi-manager ====


A tool to manage the pi cameras in multiple drones. It serves as a easy GUI for preflight system check. It uses SSH connections to gather the infos and visulizes it via a qt gui.

To install and it please read the UPTODATE README in https://gitlab.com/searchwing/development/searchwing-pi-manager or on the local repo on the laptop.