AlexaArduinoProject/lambda_light.py at master · shawnwang95/AlexaArduinoProject · GitHub

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import logging
import time
import json
import uuid
import datetime

import boto3

client = boto3.client('iot-data')

def get_utc_timestamp(seconds=None):
    return time.strftime("%Y-%m-%dT%H:%M:%S.00Z", time.gmtime(seconds))

def light_state(state):
    # Change topic, qos and payload
    response = client.update_thing_shadow(
        thingName = 'SmartCan',
        payload = json.dumps({
            'state': {
                'desired': {
                    'light': state
                }
            }
            }
            )
        )

def get_uuid():
    return str(uuid.uuid4())

# Setup logger
logger = logging.getLogger()
logger.setLevel(logging.INFO)

def lambda_handler(event, context):

    logger.info("Received v3 directive!")

    logger.info(json.dumps(event))

    if event['directive']['header']['name'] == "Discover":
        logger.info("Discover")
        response = handle_discovery(event)
    else:
        logger.info("Control")
        response = handle_control(event, context)

    logger.info("response" + json.dumps(response))
    return response


def handle_discovery(event):

        response = {
            "event":
                {
                    "header":
                    {
                        "correlationToken": "12345692749237492",
                        "namespace": "Alexa.Discovery",
                        "name": "Discover.Response",
                        "payloadVersion": "3",
                        "messageId": event['directive']['header']['messageId']
                    },
            "payload":
                {
                "endpoints":[
                        {
                          "endpointId": "a1xpbugud3mb0y.iot.us-east-1.amazonaws.com",
                          "manufacturerName": "Manufacturer 1234",
                          "friendlyName": "Your Light Name",
                          "description": "Smart Device Switch",
                          "displayCategories": ["SWITCH"],
                          "cookie": {
                            "key1": "arbitrary key/value pairs for skill to reference this endpoint.",
                          },
                          "capabilities": [
                            {
                              "type": "AlexaInterface",
                              "interface": "Alexa",
                              "version": "3"
                            },
                            {
                              "interface": "Alexa.PowerController",
                              "version": "3",
                              "type": "AlexaInterface",
                              "properties": {
                                "supported": [
                                  {
                                    "name": "powerState"
                                  }
                                ],
                                "proactivelyReported": True,
                                "retrievable": True
                              }
                            }
                        ]
                    }
                ]
            }
        }
        }
        logger.info("Response: " +json.dumps(response))
        return response


def handle_control(request, context):
    request_namespace = request["directive"]["header"]["namespace"]
    request_name = request["directive"]["header"]["name"]

    if request_namespace == "Alexa.PowerController":
        if request_name == "TurnOn":
            light_state("on")
            value = "ON"
        else:
            light_state("off")
            value = "OFF"

        response = {
            "context": {
                "properties": [
                    {
                        "namespace": "Alexa.PowerController",
                        "name": "powerState",
                        "value": value,
                        "timeOfSample": get_utc_timestamp(),
                        "uncertaintyInMilliseconds": 500
                    }
                ]
            },
            "event": {
                "header": {
                    "namespace": "Alexa",
                    "name": "Response",
                    "payloadVersion": "3",
                    "messageId": get_uuid(),
                    "correlationToken": request["directive"]["header"]["correlationToken"]
                },
                "endpoint": {
                    "scope": {
                        "type": "BearerToken",
                        "token": "access-token-from-Amazon"
                    },
                    "endpointId": request["directive"]["endpoint"]["endpointId"]
                },
                "payload": {}
            }
        }
        return response