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eman Developer Guide


The OpenDaylight Energy Management (eman) plugin implements an abstract Information Model that describes energy measurement and control features that may be supported by a variety of device types. The eman plugin may support a number of southbound interfaces to accommodate a set of protocols, including but not limited to SNMP, NETCONF, IPDR. The plugin presents a northbound REST API. This framework enables any number of applications to interoperate with any number of devices in order to measure and optimize energy usage. The Information Model will be inherited from the SCTE 216 standard – Adaptive Power Systems Interface Specification (APSIS), which in turn inherits definitions within the IETF eman document set.

This documentation is directed to developers who may use the eman features to build other OpenDaylight features or applications.

eman is composed of 3 Karaf features:
  • eman incudes the YANG model and its implementation
  • eman-api adds support for REST
  • eman-ui adds support for DLUX.

Developers will typically interface with eman-api.

eman Architecture

eman defines a YANG model that represents the IETF energy management Information Model, and includes RPCs. The implementation of the model currently supports an SNMP ‘binding’ via interfacing with the OpenDaylight SNMP module. In the future, other Southbound protocols may be supported.

Developers my use the eman-api feature to read and write energy related data and commands to devices that support the IETF eman MIBS.

Key APIs and Interfaces

The eman API currently supports a subset of the IETF eman Information Model, including the EnergyObjectPowerMeasurement table. Users of the API may get individual attributes or the entire table. When querying the table, the results are written into the MD-SAL, for subsequent access. For example, a developer may periodically poll a device for its powerMeasurements, and fetch a collection of measurements to discover a history of measurements.

Operational API

Via MD-SAL, the following endpoint provides access to previously captured power measurements.


“eo” indicates “energy object” as per the IETF Information Model



  id indicates an index into a collection

EoDevices may contain a collection of individual eoDevice objects, which in turn may contain a collection of eoPowerMeasurement objects

Operations API

A set of RPCs enable interactions with devices.

get-eoAttribute enables query on an individual attribute of a energy object:


  deviceIP indicates IP address of target device
  attribute indicates name of requested attribute


Future releases will provide a enumeration of allowed names.

The supported name are:

  • eoPower
  • eoPowerNameplate
  • eoPowerUnitMultiplier
  • eoPowerAccuracy
  • eoPowerMeasurementCaliber
  • eoPowerCurrentType
  • eoPowerMeasurementLocal
  • eoPowerAdminState
  • eoPowerOperState
  • eoPowerStateEnterReason

set-eoAttribute enables sending a command to an energy object:


  deviceIP. IP address of target device
  attribute. string indicating name of attribute. Currently, no attributes

get-eoDevicePowerMeasures reads an eoPowerMEasurements table from a device and stores the result in MD-SAL, making it available vie the operational API:


  deviceIP. IP address of target device

API Reference Documentation

See eman project page for additional information: