Eclipse Amlen vs RabbitMQ

Eclipse Amlen is a self-hosted MQTT server for IoT and web messaging. It supports MQTT versions 3 through 5 over TCP/IP and WebSockets, plus JMS, and can convert messages between MQTT and JMS. A protocol plug-in SDK lets users add other protocols, including options for legacy sensors that cannot use MQTT. The Amlen Bridge forwards MQTT messages to another MQTT server or IBM Event Streams for IBM Cloud, with filtering, topic mapping, multiple forwarders, and REST API configuration and monitoring. Security controls include TLS profiles, user ID and password authentication against a configured LDAP server, and policy-based authorization for connections, topics, subscriptions, and queues. Administrators can manage message hubs and endpoints through a WebUI or REST Administration APIs. Supported client platforms include C, Java, Android, iOS, and JavaScript. Server and WebUI downloads are listed for RHEL and AlmaLinux 8, 9, and 10. The free software has configurable delivery guarantees. One limitation is that Amlen supports a single LDAP server connection, so users and groups must be provided through that server.

RabbitMQ is an open source messaging and streaming broker for application communication, including distributed microservices, real-time data, and IoT. Publishers can route messages to one or more consumers using routing, filtering, streaming, and federation. Message acknowledgements and replication across a cluster support delivery reliability, and delivery guarantees are configurable. Supported protocols include AMQP 0-9-1, AMQP 1.0, MQTT, STOMP, RabbitMQ Streams, HTTP, and WebSocket, including browser communication over WebSocket. Client libraries are available for Java, .NET/C#, Erlang, and other languages; the project also offers a community Docker image and Kubernetes operators. RabbitMQ can run in cloud or on-premises environments, on local machines and physical or virtual hardware, and in containers. Linux, Windows, and macOS are supported; z/OS, most mainframes, and systems with less than 100 MB of RAM are not. The free, self-managed Open Source RabbitMQ Server is offered under the Mozilla Public License 2.0 with best-effort community support. VMware Tanzu RabbitMQ is a commercial offering with 24/7 support and enterprise features; pricing is by contact.