Send Apache Kafka messages through localtunnel.me

Question

I am new to Apache Kafka and I'm trying to build a Python app which is able to handle Kafka messages. I've set Kafka up to produce and consume messages locally. Now I also want this to work non-locally, so that I can send messages from everywhere to my Python app.

My idea was to just expose the specific port that Kafka is using by using Localtunnel. I thought this would just mirror the local messages, so that I can consume them via the generated URL. But surprise, it doesn't work.

I just don't receive any messages at all. Do you have an idea why this is? Do I maybe have to configure the listeners in the Kafka server.properties first?

Thanks!