REST API to KNX groups

[admin]

A for loop makes the code more compact and can't cause copy-paste errors. DPT 11 expects a table with year/month/day, not a string.

Code:

require('json')
https = require 'ssl.https'
date = os.date('%Y-%m-%d')

url = 'https://www.vattenfall.se/api/price/spot/pricearea/' .. date .. '/' .. date .. '/SN3'
status = ssl.https.request(url)

data = json.decode(status)
if type(data) ~= 'table' then
  return
end

ts = data[ 1 ].TimeStampDay
if type(ts) == 'string' then
  ts = ts:split('-')

  grp.checkupdate('5/5/28', {
    year = tonumber(ts[1]),
    month = tonumber(ts[2]),
    day = tonumber(ts[3])
  })
end

min = math.huge
max = -math.huge
cnt = 0
sum = 0

for i, item in ipairs(data) do
  price = item.Value

  min = math.min(min, price)
  max = math.max(max, price)
  sum = sum + price
  cnt = cnt + 1

  grp.checkupdate('5/5/' .. i, price)
end

grp.checkupdate('5/5/25', sum / cnt)
grp.checkupdate('5/5/26', max)
grp.checkupdate('5/5/27', min)