Thanks a lot for this incredible tool !
Everything works well ! There is just a part of the API ( data.json) that I do not understand.
My goal here is to get 2 values of a feed (at different unixtime) and calculate its difference.
I thought data.json ( https://emoncms.org/feed/data.json?id=0&start=UNIXTIME_MILLISECONDS&end=UNIXTIME_MILLISECONDS&interval=10) could help me but it is not working exactly how I thought.
First question : is it possible to get one feed value at a specific unixtime ? (Maybe without data.json)
Here is the challenge : you have this kind of cumulative value on your feed (virtual values and dates):
Unixtime : value
1 : 0
2 : 0
5 : 0
6 : 2
7 : 3
8 : 3
20 : 3
21 : 4
22 : 4
50 : 4
Imagine, you would like to have the value difference between unixtime 4 and unixtime 23 (answer is 4 because unixtime 5 : 0 and unixtime 22 : 4 )
With available API how would you do ?
Wish you the best and thank you again for this crazy good software !