PeerJS error : Cannot receive messages - peerjs

Question

Hello I'm trying to use PeerJS to send and receive message datas, so take a look to my code:
var peer = new Peer({key: 'my-personnal-peer-id-key'});
peer.on('open', function(id) {
console.log('My peer ID is: ' + id);
});
var dest = prompt("id de destination à appeller")
var conn = peer.connect(dest);
conn.send('Hello!');
conn.on('open', function() {
console.log('2')
// Receive messages
conn.on('data', function(data) {
console.log('3')
console.log('Received: ' + data);
});
});
In the window.prompt, I paste the destination peer id, but I don't receive any message in the console log at the following line:
console.log('Received: ' + data);
Please help me.

Answer 1

The connection has to have an event listener for 'data' to handle the received data. From your code, it looks like conn.send() is called before conn.on('data') is executed.
This means when conn.send is executed, the connection has no data event listener and hence the sent data is not handled at all.
It could be done like this
var conn = peer.connect(dest);
conn.on('open', function() {
console.log('2')
// Receive messages
conn.on('data', function(data) {
console.log('3')
console.log('Received: ' + data);
});
conn.send('Hello!');
});