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MQTT client JWT refresh and set TLS to 1.2 #521

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merged 2 commits into from
Dec 8, 2017
Merged

MQTT client JWT refresh and set TLS to 1.2 #521

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1684cb3
MQTT client JWT refresh and set TLS to 1.2
gguuss Nov 10, 2017
ed5eaf7
Merge branch 'master' into iot-mqtt-refresh
gguuss Nov 30, 2017
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41 changes: 37 additions & 4 deletions iot/mqtt_example/cloudiot_mqtt_example_nodejs.js
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,12 @@ var argv = require(`yargs`)
requiresArg: true,
type: 'number'
},
token_exp_mins: {
default: 20,
description: 'Minutes to JWT token expiration.',
requiresArg: true,
type: 'number'
},
mqtt_bridge_hostname: {
default: 'mqtt.googleapis.com',
description: 'MQTT bridge hostname.',
Expand Down Expand Up @@ -127,6 +133,31 @@ function publishAsync (messageCount, numMessages) {
// If we have published fewer than numMessage messages, publish payload
// messageCount + 1 in 1 second.
setTimeout(function () {
let secsFromIssue = parseInt(Date.now() / 1000) - iatTime;
if (secsFromIssue > argv.token_exp_mins * 60) {
iatTime = parseInt(Date.now() / 1000);
console.log(`\tRefreshing token after ${secsFromIssue} seconds.`);

client.end();
connectionArgs.password = createJwt(argv.project_id, argv.private_key_file, argv.algorithm);
client = mqtt.connect(connectionArgs);

client.on('connect', () => {
console.log('connect', arguments);
});

client.on('close', () => {
console.log('close', arguments);
});

client.on('error', () => {
console.log('error', arguments);
});

client.on('packetsend', () => {
// Too verbose to log here
});
}
publishAsync(messageCount + 1, numMessages);
}, delayMs);
} else {
Expand All @@ -146,17 +177,19 @@ const mqttClientId = `projects/${argv.project_id}/locations/${argv.cloud_region}
// non-empty. The password field is used to transmit a JWT to authorize the
// device. The "mqtts" protocol causes the library to connect using SSL, which
// is required for Cloud IoT Core.
const connectionArgs = {
let connectionArgs = {
host: argv.mqtt_bridge_hostname,
port: argv.mqtt_bridge_port,
clientId: mqttClientId,
username: 'unused',
password: createJwt(argv.project_id, argv.private_key_file, argv.algorithm),
protocol: 'mqtts'
protocol: 'mqtts',
secureProtocol: 'TLSv1_2_method'
};

// Create a client, and connect to the Google MQTT bridge.
const client = mqtt.connect(connectionArgs);
let iatTime = parseInt(Date.now() / 1000);
let client = mqtt.connect(connectionArgs);

// The MQTT topic that this device will publish data to. The MQTT
// topic name is required to be in the format below. The topic name must end in
Expand All @@ -180,7 +213,7 @@ client.on('error', () => {
});

client.on('packetsend', () => {
console.log('packetsend', arguments);
// Note: logging packet send is very verbose
});

// Once all of the messages have been published, the connection to Google Cloud
Expand Down