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Reference

com.webos.service.power2

API Summary

Allows client applications to power-on, power-off, and perform other power-related operations on the device.

Overview of the API

By using this service, a client application can control the power state of the device.

Note: Power states are device-specific, and these states will be added in further revisions to this document.

Using the APIs provided by this service, client application do the following:

  • Set the device in different power states:
    • setState(), getState()
    • reboot()
    • shutdown()
  • Register for state change transitions and confirm the transitions where applicable:
    • registerStateTransition()
    • respondStateTransitionAck()
  • Set a wake lock on the device
    • acquireWakeLock ()
    • releaseWakeLock()
  • Specify power-on reason
    • setPowerOnReason()
    • getPowerOnReason()

Check descriptions of specific methods to get relevant details.

Methods

setState

Description

Sets the state of the device.

This method forcefully sets the state and ignores the sequential flow of power states. This means that the client is not prompted for acknowledgement, even if you have registered for state change notifications (using registerStateTransition() method).

Note: This method can also reboot or shutdown the device. However, it is advisable to use the specific methods provided for these purposes.

Parameters

Name

Required

Type

Description

stateRequiredString

State to be set.

reasonRequiredNumber

The event that caused the state change.

Possible values are:

  • 0 - wake on LAN via external device network
  • 1 - wake on WiFi via external device network
  • 2 - power on/off by remote
  • 3 - power on by on timer

Call Returns

Name

Required

Type

Description

returnValueRequiredBoolean

Indicates the status of operation. Possible values are:

  • true - Indicates that the operation was successful.
  • false - Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCodeOptionalNumber

The error code for the failed operation.

errorTextOptionalString

Indicates the reason for the failure of the operation. See the API Error Codes Reference for more details.

Example

Set the state to ACTIVE due to wake on LAN via external device network

# luna-send -n 1 luna://com.webos.service.power2/setState '{
   "state":"ActiveState",
   "reason":1
}'

Response:

{
    "returnValue": true
}

getState

Description

Obtains the currently set state.

Parameters

Name

Required

Type

Description

subscribeOptionalBoolean

Subscribe for notifications on state changes.

  • true - Subscribe to be notified on state changes.
  • false - Get the latest state (one-time only).

Call Returns

Name

Required

Type

Description

stateRequiredString

Current state.

subscribedRequiredBoolean

Indicates whether subscribed.

returnValueRequiredBoolean

Indicates the status of operation. Possible values are:

  • true - Indicates that the operation was successful.
  • false - Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCodeOptionalNumber

The error code for the failed operation.

errorTextOptionalString

Indicates the reason for the failure of the operation. See the API Error Codes Reference for more details.

Subscription Returns

Name

Required

Type

Description

stateRequiredString

Current state.

Example

Subscribe for state change

# luna-send -n i luna://com.webos.service.power2/getState '{
   "subscribe":true
}'

Response:

{
    "state": "ActiveState",
    "subscribed": true,
    "returnValue": true
}

registerStateTransition

Description

Clients can register to get notified when the state changes from a specified state. For example, if registered to get notifications on state “ACTIVE”, you will get notified when state changes from “ACTIVE” to any other state.

Some transitions require acceptance (acknowledgement) from all clients who register to this state. For this check the respondStateTransitionAck() method.

Note: It is a subscription method. Subscription is notified when specified state change happens. setState method can be used for state change forcefully.

Parameters

Name

Required

Type

Description

stateRequiredString

State for which to register.

Call Returns

Name

Required

Type

Description

clientIdRequiredString

Identity of the client.

subscribedOptionalBoolean

Always returns true.

stateRequiredString

Current state of the device.

returnValueRequiredBoolean

Indicates the status of operation. 

Possible values are:

  • true - Indicates that the operation was successful.
  • false - Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCodeOptionalNumber

The error code for the failed operation.

errorTextOptionalString

Indicates the reason for the failure of the operation. See the API Error Codes Reference for more details.

Subscription Returns

Name

Required

Type

Description

stateRequiredString

Registered state.

nextStateRequiredString

Processing possible next state.

tokenRequiredString

Session token.

Example

Register for transitions of the ACTIVE state

# luna-send -n i luna://com.webos.service.power2/registerStateTransition '{
   "state":"ActiveState"
}'

Response:

{
   "clientId":"com.webos.lunasend-954",
   "subscribed":true,
   "state":"ActiveState",
   "returnValue":true
}

Subscription:

{
   "state":"ActiveState",
   "nextState":"PowerOffState",
   "token":"6UixZdy.4"
}

respondStateTransitionAck

Description

For clients that have registered for state change notifications, some state transitions require acceptance (acknowledgement) of all clients who register for this state :

  • If all subscribers approve (ACK), the state change occurs.
  • If even one subscriber rejects (NACK), the state does not change.
  • Clients who have not subscribed to that state are not required to vote.
  • No user input is considered as acceptance of the state change.

Parameters

Name

Required

Type

Description

stateRequiredString

Registered state.

ackRequiredBoolean

Client vote.

Possible values are:

  • true - positive acknowledgement (ACK) confirming the state transition.
  • false - negative acknowledgement (NACK) to reject the state transition.
tokenRequiredString

Session token generated in response to the registerStateTransition() method.

Call Returns

Name

Required

Type

Description

returnValueRequiredBoolean

Indicates the status of operation.

Possible values are:

  • true - Indicates that the operation was successful.
  • false - Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCodeOptionalNumber

The error code for the failed operation.

errorTextOptionalString

Indicates the reason for the failure of the operation. See the API Error Codes Reference for more details.

Example

Accept the state transition

# luna-send -n 1 luna://com.webos.service.power2/respondStateTransitionAck '{
   "ack":true,
   "state":"ActiveState",
   "token":"6UixZdy.4"
}'

Response:

{
    "returnValue": true
}

setPowerOnReason

Description

Specify the reason that caused the device to be powered on.

Parameters

Name

Required

Type

Description

reasonRequiredString

The event that caused the device to be powered.

Possible values are:

  • remoteKey - Powered on using the remote control
  • onTimer - Powered on using ON timer
  • SwDownload - Powered on after software download
  • ota - Powered on after OTA update completion

Call Returns

Name

Required

Type

Description

returnValueRequiredBoolean

Indicates the status of operation. 

Possible values are:

  • true - Indicates that the operation was successful.
  • false - Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCodeOptionalNumber

The error code for the failed operation.

errorTextOptionalString

Indicates the reason for the failure of the operation. See the API Error Codes Reference for more details.

Example

Set the reason to power-on the device

# luna-send -n 1 luna://com.webos.service.power2/setPowerOnReason '{
   "reason":"remoteKey"
}'

Response:

{
    "returnValue": true
}

getPowerOnReason

Description

Gets the last reason set for powering-on the device.

Parameters

Name

Required

Type

Description

subscribeRequiredBoolean

Subscribe for notifications on any changes.

  • true - Subscribe to be notified on any changes to the power on reason.
  • false - Get the latest reason (one-time only).

Call Returns

Name

Required

Type

Description

subscribedRequiredBoolean

Indicates whether subscribed to get notifications.

reasonRequiredString

Indicates the power on reason.

returnValueRequiredBoolean

Indicates the status of operation. 

Possible values are:

  • true - Indicates that the operation was successful.
  • false - Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCodeOptionalNumber

The error code for the failed operation.

errorTextOptionalString

Indicates the reason for the failure of the operation. See the API Error Codes Reference for more details.

Subscription Returns

Name

Required

Type

Description

reasonRequiredString

Power-on reason.

Example

Subscribe for new device power-on reasons

# luna-send -n 1 luna://com.webos.service.power2/getPowerOnReason '{
   "subscribe":true
}'

Response:

{
    "reason": "remoteKey",
    "subscribed": true,
    "returnValue": true
}

acquireWakeLock

Description

Allows the device to remain powered on for a specific time period, after which the lock is released.

Note: No other state change operation can be executed during this time period.

Parameters

Name

Required

Type

Description

clientIdRequiredString

Identity of the client.

timeoutRequiredNumber

The duration (in seconds) to hold the lock.

Call Returns

Name

Required

Type

Description

returnValueRequiredBoolean

Indicates the status of operation. 

Possible values are:

  • true - Indicates that the operation was successful.
  • false - Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCodeOptionalNumber

The error code for the failed operation.

errorTextOptionalString

Indicates the reason for the failure of the operation. See the API Error Codes Reference for more details.

Example

Acquire lock for 60 seconds

# luna-send -n 1 luna://com.webos.service.power2/acquireWakeLock '{
   "clientId":"com.webos.lunasend-5726",
   "timeout":60
}'

Response:

{
    "returnValue": true
}

releaseWakeLock

Description

Instantly releases the wake lock for the client.

Parameters

Name

Required

Type

Description

clientIdRequiredString

Identity of the client who has acquired the lock.

Call Returns

Name

Required

Type

Description

returnValueRequiredBoolean

Indicates the status of operation. 

Possible values are:

  • true - Indicates that the operation was successful.
  • false - Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCodeOptionalNumber

The error code for the failed operation.

errorTextOptionalString

Indicates the reason for the failure of the operation. See the API Error Codes Reference for more details.

Example

Release the wake lock

# luna-send -n 1 luna://com.webos.service.power2/releaseWakeLock '{
   "clientId" : "com.webos.lunasend-1110"
}'

Response:

{
    "returnValue": true
}

reboot

Description

Reboots the device with in timeout after acknowledged from registered client. LunaInterfacePMSRoot:TimeOut is configured in /var/PMS/pms.conf file as 15mins by default. Timeout is in HH:MM:SS format

Note: Client will be prompted for acknowledgement if registered for state change notifications.

Parameters

Name

Required

Type

Description

reasonRequiredString

The event that caused the device to be reboot.

Possible values are:

  • reset - Reboot after device was reset
  • ota - Reboot after OTA update completion
  • SwDownload - Reboot after software download

Call Returns

Name

Required

Type

Description

returnValueRequiredBoolean

Indicates the status of operation. 

Possible values are:

  • true - Indicates that the operation was successful.
  • false - Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCodeOptionalNumber

The error code for the failed operation.

errorTextOptionalString

Indicates the reason for the failure of the operation. See the API Error Codes Reference for more details.

Example

Reboot the device after OTA update

# luna-send -n 1 luna://com.webos.service.power2/reboot '{
   "reason" : "ota"
}'

Response:

{
    "returnValue": true
}

shutdown

Description

Shuts down the device.

Note: Client will be prompted for acknowledgement if registered for state change notifications.

This shutdown API will work differently for ose. If it is in ActiveState, it may go garage state base if it met preconditions i.e wifi on and SSID. (garageSSID can be configured in /var/PMS/pms.conf). Shuts down the device with in timeout after acknowledged from connection manager service(Precondition not met). LunaInterfacePMSRoot:TimeOut is configured in /var/PMS/pms.conf file as 15mins by default. Timeout is in HH:MM:SS format

Parameters

Name

Required

Type

Description

reasonRequiredString

The event that causes the device to be shutdown.

Possible values are:

  • remoteKey - Power off using remote control
  • offTimer - Power off using OFF timer
  • localKey - Power off using using the devices hardware power on/off key
  • diagnosticsDone - Power off device when diagnostics operation done

Call Returns

Name

Required

Type

Description

returnValueRequiredBoolean

Indicates the status of operation. 

Possible values are:

  • true - Indicates that the operation was successful.
  • false - Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCodeOptionalNumber

The error code for the failed operation.

errorTextOptionalString

Indicates the reason for the failure of the operation. See the API Error Codes Reference for more details.

Example

Shutdown the device using the remote control

# luna-send -n 1 luna://com.webos.service.power2/shutdown '{
   "reason" : "remoteKey"
}'

Response:

{
    "returnValue": true
}

API Error Codes Reference

Error Code

Error Text

Error Description

1errorPower2Busy

com.webos.service.power2 is busy

2errorInvalidJsonFormat

Invalid JSON format

3errorClientNotRegistered

The client is not registered

4errorCleintAlreadyRegistered

The client is already registered

5errorResponseTooLate

The response is too late

6errorTimerNotRunning

The timer is not running

7errorUnknown

Unknown error

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 and sample code is licensed under the Apache License 2.0.

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