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udp_server.js
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udp_server.js
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// Example adapted from https://gist.github.com/sid24rane/6e6698e93360f2694e310dd347a2e2eb
// https://gist.github.com/sid24rane
const udp = require('dgram')
const conf = require('./config/config')
const {
log
} = require('./util/loggerTool')
// --------------------creating a udp server --------------------
// creating a udp server
const server = udp.createSocket('udp4')
// emits when any error occurs
server.on('error', (error) => {
log("udp_server", "error", error)
server.close()
})
// emits on new datagram msg
server.on('message', (msg,info) => {
log("udp_server", "info", msg.toString() + ` | Received ${msg.length} bytes from ${info.address}:${info.port}`)
let timestp = new Date()
const response = {
description: 'UDP PORT TEST BY RMS Math',
serverPort: conf.port,
timestamp: timestp.toJSON(),
received: {
message: msg.toString(),
fromIP: info.address,
fromPort: info.port
}
}
const data = Buffer.from(JSON.stringify(response))
//sending msg
server.send(data, info.port, info.address, (error, bytes) => {
if(error){
log("udp_server", "error", error)
client.close()
} else {
log("udp_server", "info", 'Data sent !!!')
}
})
}) // end server.on
//emits when socket is ready and listening for datagram msgs
server.on('listening', () => {
const address = server.address()
const port = address.port
const family = address.family
const ipaddr = address.address
log("udp_server", "info", 'Server is listening at port ' + port)
log("udp_server", "info", 'Server ip :' + ipaddr)
log("udp_server", "info", 'Server is IP4/IP6 : ' + family)
})
//emits after the socket is closed using socket.close()
server.on('close', () => {
log("udp_server", "info", 'Socket is closed !')
})
server.bind(conf.port)