python 2 script which publishes the current unix timestamp to mqtt at regular intervals

mqtt-publish-time.py

#!/usr/bin/env python2

import paho.mqtt.client as mqtt
import time
import math

interval = 60

mqttc = mqtt.Client()
mqttc.connect("mqtt.space.aachen.ccc.de")
mqttc.loop_start()

def get_sleep_until(now):
        scaled_up = now / interval
        if math.ceil(scaled_up) == scaled_up:
                sleep_until = scaled_up + 1
        else:
                sleep_until = math.ceil(scaled_up)
        return sleep_until * interval

while True:
        now = time.time()
        sleep_until = get_sleep_until(now)
        if sleep_until - now > 0.001:
                time.sleep(sleep_until - now)
        mqttc.publish("time", int(round(sleep_until)))

mqttc.loop_stop()
mqttc.disconnect()