Azure Service Bus is a generic, cloud based messaging system to connect for example applications, services and devices - wherever they are.
With the help of Azure Service Bus you can organize a secure environment decoupled from your business system with ECSCore and SAP. Azure Service Bus (Relay) connects to a dedicated server over TCP and controls an endpoint, which in turn is visible to clients and can be used to exchange data with the ECSCore/SAP.
To use this functionality a Standard Tier level subscription is required which is not included in ECS Core.