Solcast API

[pioneersteffen]

Hi @all,

I need your help please. I want to use the solcast API to get a forecast for my photovoltaic system. In detail I want to get the hourly forecasts for the next 24 hours and write them to group addresses.

Here is the link for the API documentation: https://docs.solcast.com.au/?_ga=2.24121...i-pv-power

Here is my actual code:

Code:

require('json')
https = require 'ssl.https'

appid = 'XX'
lat = '52.436225'
lon ='10.42526'
azi = '170'
hours = '24'
format = 'json'
tilt = '33'
capa = '8'
​
url = 'https://api.solcast.com.au/world_pv_power/forecasts?latitude=%s&longitude=%s&hours=%s&format=%s&tilt=%s&capacity=%s&azimuth=%s&api_key=%s'
url = string.format(url, lat, lon, hours, format, tilt, capa, azi, appid)
​
res, code, headers, status = ssl.https.request(url)
log (code, status, headers)
data = json.pdecode(res)
​
--Fault messages:
if not data then
  alert('Error converting data')
  return

end

if not res then
  alert('Error collecting data')
  return
end

data = data.forecasts

-- forecast +30min

grp.write('45/1/1', data.pv_estimate)
​

I getting the following failure message: 

Code:

Solcast 08.02.2022 22:01:35
User script:36: attempt to index field 'pv_estimate' (a nil value)
stack traceback:
User script:36: in main chunk

Where is my failure? Can you help me please?

Many thanks for help!

Best Regards 
Steffen