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33 lines
3.6 KiB
Markdown
33 lines
3.6 KiB
Markdown
---
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title: Direct Device Integration API
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parent: APIs
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weight: 82
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---
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The hawkBit [update server](https://github.com/eclipse/hawkbit) provides REST resources which are consumed by the device to retrieve software update tasks.
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This API is based on HTTP standards and a polling mechanism.
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<!--more-->
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{{% note %}}
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In DDI the target is identified using a **controllerId**. Controller is used as a term for the actual service/client on the device. That allows users to have in some cases even multiple clients on the same target for different tasks, e.g. Firmware update and App management.
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{{% /note %}}
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## State Machine Mapping
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For historical reasons the DDI has a different state machine and status messages than the [Target State Machine](../../concepts/targetstate/) of the hawkBit update server.
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This is kept in order to ensure that _DDI_ stays compatible for devices out there in the field. A future version "2" of _DDI_ might change that. _DDI_ also defines more states than the update server, e.g. multiple DDI states are currently mapped by the _DDI_ implementation to _RUNNING_ state. It is possible that in the future hawkBit will fully leverage these additional states.
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The _DDI_ API allows the device to provide the following feedback messages:
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DDI `status.execution` type | handling by update server | Mapped ActionStatus type
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--------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -----------------------------------------------------
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CANCELED | This is send by the target as confirmation of a cancellation request by the update server. | CANCELED
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REJECTED | This is send by the target in case an update of a cancellation is rejected, i.e. cannot be fulfilled at this point in time. Note: the target should send a CLOSED->ERROR if it believes it will not be able to proceed the action at all. | WARNING
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CLOSED | Target completes the action either with `status.result.finished` SUCCESS or FAILURE as result. Note: DDI defines also a status NONE which will not be interpreted by the update server and handled like SUCCESS. | ERROR (DDI FAILURE) or FINISHED (DDI SUCCESS or NONE)
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PROCEEDING | This can be used by the target to inform that it is working on the action. | RUNNING
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SCHEDULED | This can be used by the target to inform that it scheduled on the action. | RUNNING
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RESUMED | This can be used by the target to inform that it continued to work on the action. | RUNNING
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<iframe width="100%" height="800px" frameborder="0" src="../../rest-api/rootcontroller-api-guide/"></iframe> |