├── README.md
└── lightbulbSwitch.js


/README.md:
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1 | # lightbulbSwitch
2 | Sample AWS Lambda function to use AWS IoT Device Shadow to switch a connected lightbulb ON or OFF
3 | 
4 | To get your endpoint for the Device Shadow API, you can use the AWS CLI:
5 | 
6 |     aws iot describe-endpoint
7 | 
8 | 


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/lightbulbSwitch.js:
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 1 | console.log('Loading function');
 2 | 
 3 | var config = {
 4 |     "thingName": 'lightbulb',
 5 |     "endpointAddress": "<PUT YOUR ENDPOINT HERE>"
 6 | }
 7 | 
 8 | var AWS = require('aws-sdk');
 9 | var iotdata = new AWS.IotData({endpoint: config.endpointAddress});
10 | 
11 | exports.handler = function(event, context) {
12 |     console.log('Received event:', JSON.stringify(event, null, 2));
13 |     iotdata.getThingShadow({
14 |         thingName: config.thingName
15 |     }, function(err, data) {
16 |         if (err) {
17 |             context.fail(err);
18 |         } else {
19 |             console.log(data);
20 |             var jsonPayload = JSON.parse(data.payload);
21 |             var status = jsonPayload.state.reported.status;
22 |             console.log('status: ' + status);
23 |             var newStatus;
24 |             if (status == 'ON') {
25 |                 newStatus = 'OFF';
26 |             } else {
27 |                 newStatus = 'ON';
28 |             }
29 |             var update = {
30 |                 "state": {
31 |                    "desired" : {
32 |                         "status" : newStatus
33 |                     }
34 |                 }
35 |             };
36 |             iotdata.updateThingShadow({
37 |                 payload: JSON.stringify(update),
38 |                 thingName: config.thingName
39 |             }, function(err, data) {
40 |                 if (err) {
41 |                     context.fail(err);
42 |                 } else {
43 |                     console.log(data);
44 |                     context.succeed('newStatus: ' + newStatus);
45 |                 }
46 |             });
47 |         }
48 |     });
49 | };
50 | 
51 | 


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