How to use the Kafka project?

I'm relatively new to Kafka and I want to publish and consume events to the Kafka running in a kafka zookeeper railway project from external code.

How should I do this? Also how do I get the api key need to gett logs from kafka to graphana?

14b01195-935a-4860-b52d-4fcb301d2a14
I when I try to hit the domain for the service with a port number I get these errors
{"level":"ERROR","timestamp":"2023-08-23T15:23:18.425Z","logger":"kafkajs","message":"[BrokerPool] Failed to connect to seed broker, trying another broker from the list: Connection timeout","retryCount":2,"retryTime":1150}
am I doing something wrong? is my broker not "kafka-production.up.railway.app:29092"
How do I set this up so that It can get external messages?
Looking it up it seems Like I need to play around with the env variables
https://www.confluent.io/blog/kafka-listeners-explained/
but when I add something like EXTERNAL:kafka-production.up.railway.app:29092 kafka crashes bc it can't bind to that
@Brody

Oh wow I didn’t know they did kafka too!
Thank you!