Sourcecode - https://github.com/senssei/azure-eventhub-kafka-c
Since there I wasn't able to find any existing libraries for connecting to Azure EventHub from C/C++ using native EventHub Kafka surface capabilities and using librdkafka to achieve it.
Existing EventHub AMQP capacities could be used to reach the same level using eitherazure-uamqp-corQpid Proton
Azure EventHub setup
https://learn.microsoft.com/en-us/azure/event-hubs/event-hubs-create
Create EventHub Namespace with minimum Standard tier since Kafka Surface is not available in Basic tier.

After creating EventHub within EventHub Namespace for the configuration we will need Hostname and Shared access policies Connection String.

Build and run
Copy getting-started.ini.sample file to getting-started.ini and update fields with XXXXXX based on the information from EventHub configuration.
Examples assumes the Event Hub name (topic name) is purchases.Consumer
docker build -f Dockerfile.consumer . azure-eventhub-kafka-c-consumer:latest
docker run azure-eventhub-kafka-c-consumer:latest
Producer
docker build -f Dockerfile.producer . azure-eventhub-kafka-c-producer:latest
docker run azure-eventhub-kafka-c-producer:latest

Materials and references
- https://learn.microsoft.com/en-us/azure/event-hubs/event-hubs-for-kafka-ecosystem-overview
- https://learn.microsoft.com/en-us/azure/event-hubs/event-hubs-kafka-connect-debezium
- https://docs.confluent.io/kafka-clients/librdkafka/current/overview.html
- https://developer.confluent.io/get-started/c/#introduction
- https://packages.debian.org/pl/sid/librdkafka-dev
- https://github.com/edenhill/librdkafka
- https://github.com/Azure/azure-event-hubs-for-kafka/tree/master/quickstart/java
- https://github.com/Azure/azure-event-hubs-for-kafka/tree/master/quickstart/kafkacat