Message Bus

The VOLTTRON message bus is the mechanism responsible for enabling communication between agents, drivers, and platform instances. The message bus supports communication using the Publish/Subscribe Paradigm and JSON RPC. Currently VOLTTRON may be configured to use only Zero MQ as message bus. We are working on porting RabbitMQ support from monolithic version of VOLTTRON(version < 10) to the latest modular version of VOLTTRON(version>=10)

To standardize message bus communication, VOLTTRON implements VIP - VOLTTRON Interconnect Protocol. VIP defines patterns for pub/sub communication as well as JSON-RPC, and allows for the creation of agent communication subsystems.

For more information please explore the message bus documentation linked below:

Message Bus Topics

• Messaging Topics
  • Introduction
  • Topics
• VOLTTRON™ Interconnect Protocol
  • Pubsub Subsystem
  • Remote Procedure Calls
  • VIP Known Identities
  • VIP Authentication
  • VIP Authorization
  • VIP Enhancements
  • Agent VIP IDENTITY Assignment Specification
  • Design Overview
  • ZeroMQ
  • Formal Specification
  • Error Handling
  • Subsystems
  • Example Exchanges
  • Reference Implementation