How do I tell the Vector MQTT sink to use protocol 3.1.1

[mrbluecoat]

I believe the Vector MQTT sink is using protocol 5. How can I configure it to use 3.1.1 instead (aka, confusingly, "V4")?

Would I replace

vector/src/sinks/mqtt/config.rs

Line 4 in 438bc8b

use rumqttc::{MqttOptions, QoS, TlsConfiguration, Transport};

use rumqttc::{ with use rumqttc::{mqttbytes::v4::

like https://github.com/ErikWegner/homecontrol-ui/blob/f76f6ff26974b0c52678ba9c312e359cfed9db1b/server/src/mqtta/actor.rs#L6

[jszwedko]

I think this would be a feature request. Would you want to open one? See https://github.com/vectordotdev/vector/issues/new?assignees=&labels=type%3A+feature&projects=&template=feature.yml

[mrbluecoat]

All set: #21395