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shadow.js
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shadow.js
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const iot = require('aws-iot-device-sdk');
const tessel = require('tessel');
const thingShadows = iot.thingShadow({
keyPath: __dirname + '/private.pem.key',
certPath: __dirname + '/certificate.pem.crt',
caPath: __dirname + '/root-certificate.pem.crt',
clientId: 'Tessel',
region: 'eu-west-1'
});
const myThingName = 'Tessel';
const reportState = () => {
'use strict';
let ledState = {'state': {'reported': {'green': tessel.led[2].isOn, 'blue': tessel.led[3].isOn}}};
console.log('Reporting LED state', ledState.state.reported);
let clientTokenUpdate = thingShadows.update(myThingName, ledState);
if (clientTokenUpdate === null) {
console.log('update shadow failed, operation still in progress');
setTimeout(reportState, 100);
}
};
const updateState = (state) => {
'use strict';
if ('green' in state && state.green === true) {
tessel.led[2].on();
console.log('Switched green LED on');
} else if ('green' in state && state.green === false) {
tessel.led[2].off();
console.log('Switched green LED off');
}
if ('blue' in state && state.blue === true) {
tessel.led[3].on();
console.log('Switched blue LED on');
} else if ('blue' in state && state.blue === false) {
tessel.led[3].off();
console.log('Switched blue LED off');
}
reportState();
};
thingShadows.on('connect', () => {
'use strict';
console.log('Connect');
thingShadows.register(myThingName, {}, () => {
console.log('Registered');
reportState();
});
});
thingShadows.on('status', (thingName, stat, clientToken, stateObject) => {
'use strict';
console.log('received ' + stat + ' on ' + thingName + ': ' + JSON.stringify(stateObject));
if (thingName === myThingName && stateObject.state.desired) {
updateState(stateObject.state.desired);
}
});
thingShadows.on('delta', (thingName, stateObject) => {
'use strict';
console.log('received delta on ' + thingName + ': ' + JSON.stringify(stateObject));
if (thingName === myThingName && stateObject.state) {
updateState(stateObject.state);
}
});
thingShadows.on('timeout', (thingName, clientToken) => {
'use strict';
console.log('received timeout on ' + thingName + ' with token: ' + clientToken);
});
thingShadows.on('error', err => {
'use strict';
console.log(err);
});