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5bf419b385
* Remove docs folder. This was a redirect from a GitHub pages site that does not appear to be in use. * Rename api folder to api-samples. * Move examples to functional-samples folder. * Move cookbook sample to functional-samples. * Move tutorials to functional-samples folder. * Move mv2 and apps folders to _archive. * Rename tools folder to .repo. * Move reference folder to functional-samples. * Update README. Update README with new relative links for reorg. * Update README.md Co-authored-by: amysteamdev <37001393+AmySteam@users.noreply.github.com> --------- Co-authored-by: amysteamdev <37001393+AmySteam@users.noreply.github.com>
44 lines
1.2 KiB
JavaScript
44 lines
1.2 KiB
JavaScript
/*
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* Node.js UDP echo server
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*
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* This demonstration shows a basic echo server that has randomly drops responses.
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* The drop factor is `threshold` 0.9 = 90% chance of succes, 10% dropped packets
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*
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* Additionally each response is delayed by 2-3 seconds.
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*
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* Listens on port 3007 by default. Pass in a desired port as cmdline argument.
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*/
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var dgram = require('dgram');
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var server = dgram.createSocket('udp4');
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var threshold = 0.99;
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server.on("listening", function() {
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var address = server.address();
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console.log("Listening on " + address.address);
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});
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server.on("message", function(message, rinfo) {
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var delay = 2000+Math.random()*1000;
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// Echo the message back to the client.
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var dropped = Math.random();
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if(dropped > threshold) {
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console.log("Recieved message from: " + rinfo.address + ", DROPPED");
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return;
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}
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console.log("Recieved message from: " + rinfo.address);
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setTimeout(function() {
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server.send(message, 0, message.length, rinfo.port, rinfo.address, function(err, bytes) {
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console.log(err, bytes);
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});
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}, delay);
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});
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server.on("close", function() {
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console.log("Socket closed");
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});
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var port = process.argv[2];
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server.bind(port ? parseInt(port) : 3007);
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