Check a thingspeak feed is update

check_tspeak.py

#!/usr/bin/env python3

import http.client
import dateutil.parser
import datetime
import time
import json

ZERO = datetime.timedelta(0)

class UTC(datetime.tzinfo):
    def utcoffset(self, dt):
        return ZERO

    def tzname(self, dt):
        return "UTC"

    def dst(self, dt):
        return ZERO

utc = UTC()

while True:
    connection = http.client.HTTPSConnection('api.thingspeak.com')
    headers = {'Content-type': 'application/json'}

    connection.request('GET', '/channels/181289/feeds/last.json', headers=headers)
    response = connection.getresponse().read()
    d = json.loads(response.decode())

    now = datetime.datetime.now(utc)
    update = dateutil.parser.parse(d['created_at'])
    delta = now - update

    print('refresh %.0f s ago' % delta.total_seconds())
    time.sleep(30.0)