Trend accumulate option

[fabiorusco]

See this thread: https://forum.logicmachine.net/showthread.php?tid=5475

Code:

require('trends')

-- get data for the past day


date = os.date('*t')

time = os.time(date, true) -- UTC timestamp
log(time)

datarange = {
  ['start'] = time - 86400,
  ['end'] = time,
}
log(datarange)
alert('passo 0')
-- fetch previous value
day = trends.fetch('Andamento_Pioggia_Valore_Unico', datarange, 900, true)
log(day)
alert('passo a')
rain=0
-- for i = START, STOP, STEP
for i = 1, 96, 1 do
  rain=rain + day[i]
end
alert('passo b')
log(rain)

I want, in the last 24 hours, steps are 15 min (900 sec), read in  how many quarter of hour have rain. With the script above alert '(passo a') don't is showed. Can someone tell where is my mistake please?