Firsttime run issue 'vwi_waypoints_generator.py' script

[FestinaLenteNL]

Hi,
for boat owners and OpenCPN users this project is a great find.

Marcel are you still supporting this project?
If yes: I have an issue with first run of the 'vwi_waypoints_generator.py' script in a fresh install of OpenCPN 5.10.2 installed on Raspberry using the OpenPlotter provided image (openmarine.org).

I assume the script performs a file check to a non existing file or something like that. My programming skills are to limited to adjust this. (below I used the -force option though there is no difference not using this option)
>>>>>>>>>>>start>>>>>>>>>
pi@openplotter:~/Documents/Test $ python3 vwi_waypoints_generator.py -force
Latest geoinfomation: {
"GeoType": "geogeneration",
"GeoGeneration": 3408,
"PublicationDate": "2024-10-21T14:24:07.575Z",
"Active": true
}
Traceback (most recent call last):
File "/home/pi/Documents/Test/vwi_waypoints_generator.py", line 431, in
if readJson(last_publication_filename).get('GeoGeneration') == geoInfo.get('GeoGeneration'):
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/pi/Documents/Test/vwi_waypoints_generator.py", line 400, in readJson
with open(filename) as f:
^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'lastPublication.json'

<<<<<<<<<<end<<<<<<<<<<<<<

[marcelrv]

I can't check right now, but the error is about missing lastPublication.json file.
Don't know why it is missing, but possibly download it from the GitHub or create the file and paste { "GeoType": "geogeneration", "GeoGeneration": 3408, "PublicationDate": "2024-10-21T14:24:07.575Z", "Active": true }

In it

[FestinaLenteNL]

Hi Marcel and all followers,
It's now working.

What I did so others can benefit from it:
I'm running OpenCPN on a Raspberry Model 4b (8GB RAM and 32GB SD) that is loaded with the OpenPlotter image (see openmarine.net for more info on that topic when you interested). As I have my Raspberry mounted to a 7"touchscreen DSI screen I used the image 'OpenPlotter Touchscreen'
This image gives me a a clean OpenCPN 5.10.2 installation.

The required python3 module is not present in this OpenPlotter image so I had to install that using the command 'sudo apt install python3-gpxpy' in the CLI command screen. Which can be opened via the shortcut 'LXTerminal' from the menu for those not familiar with command line and so on.

To test this script I first created a directory 'Test' in the './Documents' directory to see what would happen and not created all kind of directories and files throughout my working OpenCPN application (command: 'mkdir Test').

In that directory I had to copy the files 'vwi_waypoints_generator.py' and 'lastPublication.json' It turned out I also had to create a sub-directory './working' in the './Test' directory.

Now I can run the command 'python3 vwi_waypoints_generator.py' having the './Test' directory as my active directory.
A download will start filling up files with downloaded data to the working directory followed by processing the downloaded data into GPX files stored in the current './Test' directory.
All off this took about 4 minutes and created: 12 files, about 25MB in the ./Test/working directory and 30 GPX files, 14MB in the ./Test directory.
The downloading was done using my onboard Huawei MIFI 4G router and took estimated 50% of the total time.

The next step would be to import the GPX of your choise and needs in OpenCPN

My next actions is to make up my mind whether:

• I can modify the script in such a way that only the GPX files are created in which I'm interested.
• I can add some lines to cleanup the contents of the working directory after completing the GPX files and if that is usefull
• I can find a way to import GPX files into OpenCPN automatically after these have been updated via this script and decide if this is desired or that some human interaction in this makes sense.

Have fun!

[marcelrv]

Happy that it works for you.

Based on your notes, I guess you copied the specific python files, rather than cloning the whole project (as in that case the working directory & lastPublication.json should have been already available for you.

If you want to limit the files created, you can play around e.g. with editing this section:
https://github.com/marcelrv/OpenCPN-Waypoints/blob/main/vwi_waypoints_generator.py#L479-L485
and below that line you see sections for each of the types, you can simply disable the section you are not interested in.

Note: I don't cleanup the working directory as some of the files may not be updated, and it would require you to download these files each time again. So the script first checks how old are the files and creates newer files only when required.

Wrt automaticllty updating in OpenCPN, I found no great way.
but.. If I recall right, you can override the gpx file and it will automatically pick up the new waypoints when OpenCPN is restarted.

[FestinaLenteNL]

PS.
As I had to replace my only 6months old micro-SD card.

As Marcel mentioned above:
To clone a project go to terminal session and enter: git clone https://github.com/marcelrv/OpenCPN-Waypoints
for example standing in the user's 'Pi' home directory it will create a directory ".../OpenCPN-Waypoints/..."

I chose to move the created directory and sub-directories to "../home/pi/OpenCPN/Waypoints_mrv/..." .
I keep all OSM and ENC maps in "../OpenCPN/.." so everything related to OpenCPN is nicely organized there.

Special comment to my fellow dutch countryman : Ik dacht goedkoop uit te zijn met een Kruidvat kaartje. Tja ik lever hier een subjectief oordeel, het zou ook heel goed kunnen dat ik een maandag ochtend pech kaartje had maar toch maar een ander merk gekocht ter vervanging.