Power Plugin

Version: 1.0

Status:

Power plugin for Thunder framework.

Introduction

Scope

This document describes purpose and functionality of the Power plugin. It includes detailed specification about its configuration, methods and properties as well as sent notifications.

Case Sensitivity

All identifiers of the interfaces described in this document are case-sensitive. Thus, unless stated otherwise, all keywords, entities, properties, relations and actions should be treated as such.

Acronyms, Abbreviations and Terms

The table below provides and overview of acronyms used in this document and their definitions.

Acronym	Description
API	Application Programming Interface
HTTP	Hypertext Transfer Protocol
JSON	JavaScript Object Notation; a data interchange format
JSON-RPC	A remote procedure call protocol encoded in JSON

The table below provides and overview of terms and abbreviations used in this document and their definitions.

Term	Description
callsign	The name given to an instance of a plugin. One plugin can be instantiated multiple times, but each instance the instance name, callsign, must be unique.

References

Ref ID	Description
HTTP	HTTP specification
JSON-RPC	JSON-RPC 2.0 specification
JSON	JSON specification
Thunder	Thunder API Reference

Configuration

The table below lists configuration options of the plugin.

Name	Type	M/O	Description
callsign	string	mandatory	Plugin instance name (default: Power)
classname	string	mandatory	Class name: Power
locator	string	mandatory	Library name: libThunderPower.so
startmode	string	mandatory	Determines in which state the plugin should be moved to at startup of the framework
configuration	object	optional	...
configuration?.powerkey	integer	optional	Key associated as powerkey
configuration?.offmode	string	optional	Type of offmode
configuration?.control	boolean	optional	Enable control clients
configuration?.gpiopin	integer	optional	GGIO pin (Broadcom)
configuration?.gpiotype	sting	optional	GPIO type (Broadcom)
configuration?.statechange	integer	optional	Statechange (Broadcom)

Interfaces

This plugin implements the following interfaces:

IPower (IPower.h) (version 1.0.0) (compliant format)

This interface uses legacy lowercase naming convention. With the next major release the naming convention will change to camelCase.

Methods

The following methods are provided by the Power plugin:

Built-in methods:

Method	Description
versions	Retrieves a list of JSON-RPC interfaces offered by this service
exists	Checks if a JSON-RPC method or property exists
register	Registers for an asynchronous JSON-RPC notification
unregister	Unregisters from an asynchronous JSON-RPC notification

Power interface methods:

Method	Description
setstate / set	Set the power state

versions ^method

Retrieves a list of JSON-RPC interfaces offered by this service.

Parameters

This method takes no parameters.

Result

Name	Type	M/O	Description
result	array	mandatory	A list ofsinterfaces with their version numbers Array length must be at most 255 elements.
result[#]	object	mandatory	...
result[#].name	string	mandatory	Name of the interface
result[#].major	integer	mandatory	Major part of version number
result[#].minor	integer	mandatory	Minor part of version number
result[#].patch	integer	mandatory	Patch part of version version number

Example

Request

{
  "jsonrpc": "2.0",
  "id": 42,
  "method": "Power.1.versions"
}

Response

{
  "jsonrpc": "2.0",
  "id": 42,
  "result": [
    {
      "name": "JMyInterface",
      "major": 1,
      "minor": 0,
      "patch": 0
    }
  ]
}

exists ^method

Checks if a JSON-RPC method or property exists.

Description

This method will return True for the following methods/properties: getstate, versions, exists, register, unregister, setstate.

Parameters

Name	Type	M/O	Description
params	object	mandatory	...
params.method	string	mandatory	Name of the method or property to look up

Result

Name	Type	M/O	Description
result	boolean	mandatory	Denotes if the method exists or not

Example

Request

{
  "jsonrpc": "2.0",
  "id": 42,
  "method": "Power.1.exists",
  "params": {
    "method": "methodName"
  }
}

Response

{
  "jsonrpc": "2.0",
  "id": 42,
  "result": false
}

register ^method

Registers for an asynchronous JSON-RPC notification.

Description

This method supports the following event names: statechange.

Parameters

Name	Type	M/O	Description
params	object	mandatory	...
params.event	string	mandatory	Name of the notification to register for
params.id	string	mandatory	Client identifier

Result

Name	Type	M/O	Description
result	null	mandatory	Always null

Errors

Message	Description
`ERROR_FAILED_REGISTERED`	Failed to register for the notification (e.g. already registered)

Example

Request

{
  "jsonrpc": "2.0",
  "id": 42,
  "method": "Power.1.register",
  "params": {
    "event": "eventName",
    "id": "myapp"
  }
}

Response

{
  "jsonrpc": "2.0",
  "id": 42,
  "result": null
}

unregister ^method

Unregisters from an asynchronous JSON-RPC notification.

Description

This method supports the following event names: statechange.

Parameters

Name	Type	M/O	Description
params	object	mandatory	...
params.event	string	mandatory	Name of the notification to register for
params.id	string	mandatory	Client identifier

Result

Name	Type	M/O	Description
result	null	mandatory	Always null

Errors

Message	Description
`ERROR_FAILED_UNREGISTERED`	Failed to unregister from the notification (e.g. not yet registered)

Example

Request

{
  "jsonrpc": "2.0",
  "id": 42,
  "method": "Power.1.unregister",
  "params": {
    "event": "eventName",
    "id": "myapp"
  }
}

Response

{
  "jsonrpc": "2.0",
  "id": 42,
  "result": null
}

setstate ^method

Set the power state.

set is an alternative name for this method. This name is deprecated and may be removed in the future. It is not recommended for use in new implementations.

Parameters

Name	Type	M/O	Description
params	object	mandatory	...
params.state	string	mandatory	The power state to set (must be one of the following: ActiveStandby, Hibernate, On, PassiveStandby, PowerOff, SuspendToRAM)
params.waittime	integer	mandatory	The time to wait for the power state to be set in seconds

Result

Name	Type	M/O	Description
result	null	mandatory	Always null

Errors

Message	Description
`ERROR_GENERAL`	General failure
`ERROR_DUPLICATE_KEY`	Trying to set the same power mode
`ERROR_ILLEGAL_STATE`	Power state is not supported
`ERROR_BAD_REQUEST`	Invalid Power state or Bad JSON param data format

Example

Request

{
  "jsonrpc": "2.0",
  "id": 42,
  "method": "Power.1.setstate",
  "params": {
    "state": "Hibernate",
    "waittime": 10
  }
}

Response

{
  "jsonrpc": "2.0",
  "id": 42,
  "result": null
}

Properties

The following properties are provided by the Power plugin:

Power interface properties:

Property	R/W	Description
getstate / state	read-only	Get the current power state

getstate ^property

Provides access to the get the current power state.

This property is read-only.

state is an alternative name for this property. This name is deprecated and may be removed in the future. It is not recommended for use in new implementations.

Value

Name	Type	M/O	Description
(property)	string	mandatory	The current power state (must be one of the following: ActiveStandby, Hibernate, On, PassiveStandby, PowerOff, SuspendToRAM)

Example

Get Request

{
  "jsonrpc": "2.0",
  "id": 42,
  "method": "Power.1.getstate"
}

Get Response

{
  "jsonrpc": "2.0",
  "id": 42,
  "result": "PassiveStandby"
}

Notifications

Notifications are autonomous events triggered by the internals of the implementation and broadcasted via JSON-RPC to all registered observers. Refer to [Thunder] for information on how to register for a notification.

The following events are provided by the Power plugin:

Power interface events:

Notification	Description
statechange	Signals a change in the power state

statechange ^notification

Signals a change in the power state.

Notification Parameters

Name	Type	M/O	Description
params	object	mandatory	...
params.origin	string	mandatory	The state the device is transitioning from (must be one of the following: ActiveStandby, Hibernate, On, PassiveStandby, PowerOff, SuspendToRAM)
params.destination	string	mandatory	The state the device is transitioning to (must be one of the following: ActiveStandby, Hibernate, On, PassiveStandby, PowerOff, SuspendToRAM)
params.phase	string	mandatory	The phase of the transition (must be one of the following: After, Before)

Example

Registration

{
  "jsonrpc": "2.0",
  "id": 42,
  "method": "Power.1.register",
  "params": {
    "event": "statechange",
    "id": "myid"
  }
}

Notification

{
  "jsonrpc": "2.0",
  "method": "myid.statechange",
  "params": {
    "origin": "ActiveStandby",
    "destination": "SuspendToRAM",
    "phase": "After"
  }
}

The client ID parameter is passed within the notification designator, i.e. <client-id>.statechange.

Power Plugin

Table of Contents

Introduction

Scope

Case Sensitivity

Acronyms, Abbreviations and Terms

References

Configuration

Interfaces

Methods

versions method

Parameters

Result

Example

Request

Response

exists method

Description

Parameters

Result

Example

Request

Response

register method

Description

Parameters

Result

Errors

Example

Request

Response

unregister method

Description

Parameters

Result

Errors

Example

Request

Response

setstate method

Parameters

Result

Errors

Example

Request

Response

Properties

getstate property

Value

Example

Get Request

Get Response

Notifications

statechange notification

Notification Parameters

Example

Registration

Notification

versions ^method

exists ^method

register ^method

unregister ^method

setstate ^method

getstate ^property

statechange ^notification