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Syntax:
```js
const socket = io({
retries: 3,
ackTimeout: 10000
});
// "my-event" will be sent up to 4 times (1 + 3), until the server sends an acknowledgement
socket.emit("my-event", (err) => {});
```
Notes:
- the order of the packets is guaranteed, as we send packets one by one
- the same packet id is reused for consecutive retries, in order to
allow deduplication on the server side