RabbitMQ

The official "hello-world" example for python on RabbitMQ's homepage describes a message broker in the following way:

RabbitMQ is a message broker: it accepts and forwards messages. You can think about it as a post office: when you put the mail that you want posting in a post box, you can be sure that Mr. or Ms. Mailperson will eventually deliver the mail to your recipient. In this analogy, RabbitMQ is a post box, a post office and a postman.

The major difference between RabbitMQ and the post office is that it doesn't deal with paper, instead it accepts, stores and forwards binary blobs of data ‒ messages.

For every registered application in Lime CRM, there exists a message queue (or a post box) in RabbitMQ.

Every time an object is created, updated or deleted in the platform, a message is sent to the application's message queue.

Configuration

Communication to RabbitMQ goes through the amqp protocol over port 5672

Any service (Event handler, Task handler, Webserver) connecting to RabbitMQ can be configured as

# config.yaml
events:
    connection_string:  amqp://guest@localhost//