Initial Code - Google Cloud IoT Core

[brentru]

CircuitPython client library for interacting with Google Cloud IoT Core.

Cloud_Core

• JWT generation with RTC network time
• Generates Client Identifier from secrets.py file, used by MQTT_API

MQTT_API

• Client for interacting with Google Cloud IoT Core's MQTT Bridge
  • Supports publishing telemetry data from a CircuitPython device to Google Cloud IoT Core
  • Supports receiving configuration data from Google Cloud IoT Core
  • Eclipse Paho-Like interface with helpers for subscribing to feeds, managing connection, control loops, and publishing data.

[brentru]

@ladyada Pull request tested and updated to include CircuitPython_NTP (adafruit/Adafruit_CircuitPython_NTP#1), drops dependency for Adafruit IO.

[brentru]

@ladyada cleaned up and passing.

[brentru]

Connected MiniMQTT unsuback and suback callback methods from code.py within MQTT_API. Adding methods to handle unsubscribe'ing from feeds and unsubscribing from the default device commands mqtt wildcard feed

[brentru]

Removed # pylint: disable=protected-access line

[brentru]

@ladyada Requesting a review of this code, ran it the past day with a project.