Eclipse Hono is a cloud-native IoT messaging platform that ingests telemetry and events from devices via multiple protocols (MQTT, CoAP, HTTP, AMQP, LoRa, Sigfox) and routes them to northbound applications over AMQP, Kafka, or Google Pub/Sub. The codebase is modular, comprising protocol adapters, device registry services (JDBC and MongoDB), authentication, command routing, and client libraries. It is built on Vert.x and Quarkus, uses Micrometer for metrics and OpenTracing/OpenTelemetry for distributed tracing. The system handles device registration, credentials management, tenant configuration, connection limits, and resource governance. It includes a CLI tool for consuming telemetry and a comprehensive integration test suite. The repository is actively maintained with frequent commits and CI pipelines.