garbage can trigger

[admin]

Here's an example that you can use a starting point. data variable should contain the ICS file contents that you get externally.

First the script parses ICS events into a table. Then it looks for an event with a matching date. summary variable is the summary field (kind of garbage in your case) of the found event or an empty string. Change 1/1/1 as needed and use 250 byte string as the data type of this object.

Code:

url = 'https://p35-caldav.icloud.com/published/2/MTQzMzA1NjcxOTE0MzMwNXFFkpAlN-RmUw02iYPAHdjXli1qufT3m2kVvFAFS2VXJLUhJ6r02NrhV15B8p_WoReJ0k5wrU4I1th5F6eq8UI'
data, err = require('socket.http').request(url)

if not data then
  log('request failed', err)
  return
end

data = data:split('\n')

events = {}

for _, line in ipairs(data) do
  line = line:trim()

  if line == 'BEGIN:VEVENT' then
    event = {}
  elseif line == 'END:VEVENT' then
    events[ #events + 1 ] = event
    event = nil
  elseif event then
    pos = line:find(':')
    if pos then
      key = line:sub(1, pos - 1)
      value = line:sub(pos + 1)

      event[ key ] = value
    end
  end
end

now = os.date('%Y%m%d')
summary = ''

for _, event in ipairs(events) do
  if event['DTSTART;VALUE=DATE'] == now then
    summary = event['SUMMARY']
    break
  end
end

grp.checkupdate('1/1/1', summary)