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index.js
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index.js
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require('dotenv').config();
const mqtt = require('mqtt')
const axios = require('axios')
// Setup broker
const BROKER_HOST = process.env.BROKER_HOST
const BROKER_PORT = process.env.BROKER_PORT
const BROKER_CLEAN_CONNECTION = process.env.BROKER_CLEAN_CONNECTION
const BROKER_TIMEOUT = process.env.BROKER_TIMEOUT
const BROKER_RECONNECT_PERIOD= process.env.BROKER_RECONNECT_PERIOD
// Setup listener
const LISTENER_METHOD = process.env.LISTENER_METHOD
const LISTENER_HOST = process.env.LISTENER_HOST
const LISTENER_PORT = process.env.LISTENER_PORT
const LISTENER_URL = `${LISTENER_METHOD}://${LISTENER_HOST}:${LISTENER_PORT}/api`
// Compute broker client and url
const BROKER_CLIENT_ID = `sijaka_client_${Math.random().toString(16).slice(3)}`
const BROKER_URL = `mqtt://${BROKER_HOST}:${BROKER_PORT}`
// Create connection
const client = mqtt.connect(BROKER_URL, {
BROKER_CLIENT_ID,
clean: BROKER_CLEAN_CONNECTION,
connectTimeout: BROKER_TIMEOUT,
reconnectPeriod: BROKER_RECONNECT_PERIOD,
})
// Set the topic
const topics = [
'sijaka/train/+/origin',
'sijaka/train/+/destination',
'sijaka/train/+/location',
'sijaka/station/+/schedule/+/depart_time',
'sijaka/station/+/schedule/+/arrive_time',
]
post = function(path, topic, data) {
const payload = {
topic: topic,
data: data
}
const header = {
headers: {
Accept: 'application/json',
'X-SIJAKA-APIKEY': process.env.APP_API_KEY
}
}
axios.post(`${LISTENER_URL}/${path}`, payload, header)
.then((response) => {
if (response.status === 200) {
console.log(`[HTTP] Topic ${topic} with value ${data} posted to the listener.`)
} else {
console.error(`[HTTP] Failed to post the data! The status code is: ${response.status}.`)
console.error(response)
}
}).catch((error) => {
console.error(`[HTTP] ${error}`)
})
}
client.on('connect', () => {
console.log('[MQTT] Connected to broker!')
client.subscribe(topics, () => {
console.log(`[MQTT] Subscribed to topic '${topics}'!`)
})
})
client.on('message', (topic, payload) => {
console.log(`[MQTT] Received message at ${topic} that says ${payload}`)
console.log(`[MQTT] Requesting HTTP request to listener...`)
post(topic, topic, payload.toString())
})