MQTT/REST Time Helpers

[brentru]

#53

Add ability to subscribe to time topics

time/millis
time/seconds
time/ISO-8601

API Client (client.py)

• modified client.py's URL parsing to reflect new API call to: /time/{value}
• added receive_time(time_Value) to client.py as a helper method
• example call: ms_val = aio.receive_time('millis')

MQTT Client (mqtt_client.py)

• modified mqtt_client.py and added in helper subscribe_time
• example call: client.subscribe_time('seconds')

[brentru]

Testing....
REST API
python3 examples/aio_basics/adafruitio_17_time.py

---Adafruit IO REST API Time Helpers---
Seconds: aio.receive_time(seconds)
1530906256
Milliseconds: aio.receive_time(millis)
1530906256724
ISO-8601: aio.receive_time(ISO-8601)
2018-07-06T19:44:16+00:00

MQTT API
python3 examples/mqtt/mqtt_time.py

• Subscribing to /time/seconds
  Connected to Adafruit IO!
  Feed time received new value: 1530906374
  Feed time received new value: 1530906375
• Subscribing to /time/millis
  Feed time received new value: 1530906375990
  Feed time received new value: 1530906376
  Feed time received new value: 1530906376990
  Feed time received new value: 1530906377
• Subscribing to iso-8601
  Feed time received new value: 2018-07-06T19:46:17.990Z
  Feed time received new value: 1530906377990
  Feed time received new value: 1530906378
  Feed time received new value: 2018-07-06T19:46:18.990Z
  Feed time received new value: 1530906378990
  Feed time received new value: 1530906379

Merging in!