See: https://qiita.com/ma2shita/items/8f1b4b12faa99dd17063 | SORACOM LTE-M Button (AWS IoT 1-Click) -> this function)

max1click-demo_JF2018_call.py

"""
required ENVs;
- INCOMING_WEBHOOK: Slack's Incoming Webhook URL
- PARSON_(SINGLE|DOUBLE|LONG): JSONfy String
    {"name": <Display name and Thing name:String>,
     "slack_id": <Slack member ID (see profile):String>}
    e.g.) {"name":"max","slack_id":"UC0RVEWBZ"}
"""

import json
import os
import logging
logger = logging.getLogger()
logger.setLevel(logging.INFO)
import urllib.request, urllib.parse
import boto3

def lambda_handler(event, context):
    logger.info('Received event: ' + json.dumps(event)) # Output to Cloudwatch Log
    parson = json.loads(os.environ['PARSON_{}'.format(event['deviceEvent']['buttonClicked']['clickType'])])

    body = {'text': '<@{}> が呼ばれたよ！現場に行けそうなら `ok ~~` と返すとステータスが更新されるよ。気付いてなさそうならフォローを！'.format(
        parson['slack_id'], parson['name'])
    }
    headers = {'Content-Type': 'application/json'}
    req = urllib.request.Request(os.environ['INCOMING_WEBHOOK'],
                                  data=json.dumps(body).encode('utf-8'),
                                  method='POST', headers=headers)
    with urllib.request.urlopen(req) as res:
        logger.info(res.read().decode("utf-8"))

    shadowDoc = {'state':{'reported':{'status':'calling'}}}
    iot = boto3.client('iot-data')
    iot.update_thing_shadow(thingName=parson['name'], payload=json.dumps(shadowDoc))

    f = boto3.client("lambda")
    f.invoke(
        FunctionName='max1click-demo_JF2018_transiton_to_idle',
        InvocationType='Event',
        Payload=json.dumps({
            'thing_name': parson['name'],
            'transition_wating_sec': 30
        })
    )

    return {"statusCode": 204}