Date: 21/4/2020

So. I have had confirmation from the creator of MMM-JsonTable that I cant display a local JSON file. So Im going to have to try something else.
What I can do is use the Dropbox module to upload my JSON from the Raspi to the internet, and then MMM-JsonTable will download that JSON (even though it was created in the same directory - stupid thing!) and display it.

Ive managed to get that running - at the moment the program is running every morning at 3AM on crontab, but I am still keen to fix that and make it more secure. Hmmm

​If you're interested the JSON files for the tides in portsmouth are here