Closed
Description
- Version:
v12.12.0 - Platform:
macos catalina/10.15 (19A602) - Subsystem:
n/a
When sending an empty udp message, the message will not be received until another non-empty udp message is received.
Example/Reproduce: (may only affect macos 10.15?)
file server.js
var PORT = 33333;
var HOST = '127.0.0.1';
var dgram = require('dgram');
var server = dgram.createSocket('udp4');
server.on('listening', function() {
var address = server.address();
console.log('UDP Server listening on ' + address.address + ':' + address.port);
});
server.on('message', function(message, remote) {
console.log(remote.address + ':' + remote.port +' - ' + message);
});
server.bind(PORT, HOST);
file client_test.js
var PORT = 33333;
var HOST = '127.0.0.1';
var dgram = require('dgram');
var client = dgram.createSocket('udp4');
var message = Buffer.from('abc');
client.send(message, 0, message.length, PORT, HOST, function(err, bytes) {
if (err) throw err;
console.log('UDP message sent to ' + HOST +':'+ PORT);
client.close();
});
file client_0.js
var PORT = 33333;
var HOST = '127.0.0.1';
var dgram = require('dgram');
var client = dgram.createSocket('udp4');
var message = Buffer.from('');
client.send(message, 0, message.length, PORT, HOST, function(err, bytes) {
if (err) throw err;
console.log('UDP message sent to ' + HOST +':'+ PORT);
client.close();
});
run the server code, then run the client_0.js: no response in server.
followed by running client_test.js: server got empty and the "abc" message.