Working with Protocols

Process steps use messaging protocols to send and receive information. Messaging protocols are applied when a subscription trigger starts or joins a process, and when information is sent and received within the process, such as when catching and throwing BPMN events. Designer supports the following four protocols, although some protocols are not available for specific activity or event types:

Protocol	Description	Used by
Subscription	For Publishable Documents	Used by send and receive task activities, message events, signal events, and the start none event. See Configuring a Subscription-Triggered Process and About Subscription Triggered Process Generation.
Simple Service	For Synchronous Receive and Send	Used by send and receive task activities for two-way synchronous information exchange. See Configuring a Simple Service Triggered Process and About Simple Service Triggered Process Generation.
JMS	For JMS Triggered Processes	Used by send and receive task activities, message events, signal events, and the start none event. See Configuring a JMS-Triggered Process and About JMS-Triggered Process Generation.
EDA	For EDA Event Triggered Processes	Used by message events. See Configuring an EDA-Triggered Process and About EDA Triggered Process Generation.

Message end events only send information, so they use only the send version of the selected protocol. Message start events only receive information, so they only use the receive version of the selected protocol.