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//
// serialserver.js
// WebSocket serial server
//
// Neil Gershenfeld
// (c) Massachusetts Institute of Technology 2016
//
// This work may be reproduced, modified, distributed, performed, and
// displayed for any purpose, but must acknowledge the mods
// project. Copyright is retained and must be preserved. The work is
// provided as is; no warranty is provided, and users accept all
// liability.
//
// check command line
//
if (process.argv.length < 4) {
console.log("command line: node serialserver.js client_address server_port")
process.exit(-1)
}
//
// start server
//
var client_address = process.argv[2]
var server_port = process.argv[3]
console.log("listening for connection from client address "+client_address+" on server port "+server_port)
var SerialPort = require('serialport')
var port = null
var WebSocketServer = require('ws').Server
wss = new WebSocketServer({port:server_port})
//
// handle connection
//
wss.on('connection',function(ws) {
//
// check address
//
if (ws._socket.remoteAddress != client_address) {
console.log("connection rejected from "+ws._socket.remoteAddress)
ws.send('socket closed')
ws.close()
}
else {
console.log("connection accepted from "+ws._socket.remoteAddress)
}
//
// handle messages
//
var cancel
ws.on("message",function(message) {
var msg = JSON.parse(message)
//
// open port
//
if (msg.type == 'open') {
var device = msg.device
var baud = parseInt(msg.baud)
var flow = msg.flow
console.log('open '+device+' at '+baud+' flow '+flow)
if (flow == 'none')
port = new SerialPort(device,{baudRate:baud})
port = new SerialPort(device,{baudRate:baud,rtscts:true})
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port.on('open',function() {
ws.send('serial port opened')
if (flow == 'dsrdtr') {
port.set({dsr:true,dtr:true})
port.set({rts:false,cts:false})
}
})
port.on('error',function(err) {
ws.send(err.message)
})
port.on('data',function(data) {
ws.send(data.toString('binary'))
})
}
//
// close port
//
else if (msg.type == 'close') {
var device = msg.device
console.log('close '+device)
ws.send('serial port closed')
port.close()
port = null
}
//
// send string
//
else if (msg.type == 'string') {
console.log(msg.string)
port.write(msg.string,function(){
port.drain(function(err){
if (err)
ws.send(err.message)
})
})
}
//
// send command
//
else if (msg.type == 'command') {
console.log(msg.contents)
port.write(msg.contents,function(){
port.drain(function(err){
if (err)
ws.send(err.message)
else
ws.send('done')
})
})
}
//
// cancel job
//
if (msg.type == 'cancel') {
cancel = true
}
//
// send file
//
else if (msg.type == 'file') {
var count = 0
console.log('writing '+msg.name+' length '+msg.contents.length)
cancel = false
write_char()
//
// character writer
//
function write_char() {
//
// cancel
//
if (cancel) {
console.log('cancel')
ws.send('cancel')
}
//
// continue
//
else {
port.write(msg.contents[count],function(){
port.drain(function(err){
if (err)
ws.send('error '+err.message)
else {
ws.send((count+1)+'/'+msg.contents.length)
count += 1
if (count < msg.contents.length)
write_char()
else {
console.log('done')
ws.send('done')
}
}
})
})
}
}
}
})
//
// close
//
ws.on("close",function() {
console.log("connection closed")
if (port != null)
port.close()
port = null
})
})