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server.js
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server.js
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var debug;
var startServer = function(port,callback) {
var net = require('net');
var server = new net.Server();
server.maxConnections = 1;
server.listen(port);
server.on('listening', function() {
console.log('accepting connections on port ' + port);
callback(server);
});
};
var ipAddress = function(socket) {
var addr = socket.remoteAddress;
if (addr.indexOf(':') > -1) {
var arr = addr.split(':');
return arr[arr.length - 1];
} else {
return addr;
}
};
var startListen = function(server,callback) {
server.on('connection', function(socket) {
console.log('new connection from ' + ipAddress(socket));
callback(socket);
});
};
var openDevice = function(device,callback) {
console.log('opening device ' + device.path);
device.open(function(err) {
if (err)
throw err;
});
device.on('open', function() {
console.log('flushing port!');
device.flush(function() {
console.log('device ready!')
callback();
});
});
}
var closeDevice = function(device) {
console.log('closing device ' + device.path);
device.close();
};
var print = function(text,data) {
console.log(text + ': ' + data.toString('hex'));
};
var monitor = function(device,socket) {
socket.on('data', function(data) {
if (debug) {
print('[dev<-tcp]',data);
}
device.write(data);
});
device.on('data', function(data) {
if (debug)
print('[dev->tcp]',data);
socket.write(data);
});
socket.on('end', function() {
closeDevice(device);
});
};
module.exports = {
start: function(obj) {
var device = obj.device;
var port = obj.port;
if ((device) && (port)) {
if (obj.debug)
debug = obj.debug;
startServer(obj.port, function(server) {
startListen(server, function(socket) {
openDevice(obj.device, function() {
monitor(device,socket);
});
});
});
} else {
console.log('invalid parameters!');
}
}
}