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- Makes links on the root README.md direct to the hosted documentation.
- includes discovery in the sequences index page
- split hardware to explicitly describe the different fields
- Correct version description in schema (no longer major version)
- add expected behaviour on config
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@noursaidi
noursaidi authored Apr 28, 2022
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38 changes: 20 additions & 18 deletions .gencode_hash.txt
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fb243b3fa232d8497472869b0cf1acb2accea6dee72bbd006ec82396fd0012a9 gencode/java/udmi/schema/DiscoveryEvent.java
04112dd47b0f761131c276c67d3cd8b789d25e6716b5732be9fef14fc6831f1d gencode/java/udmi/schema/DiscoveryModel.java
9962b0eb7d5adf52af6160e9f3131f8eeb52ae9e518954dbb6aead1bcad0245e gencode/java/udmi/schema/DiscoveryState.java
090bbaf1508aa6ca8380af936af990673f300eb5a940c9e8ab94deb64efa2b7b gencode/java/udmi/schema/Entry.java
Expand All @@ -35,11 +35,12 @@ efb376cd7a80ca74fbf74d3ef3f4101d393341a91d01db36456aa84f6be3d0a5 gencode/java/u
60a8115ae1acae7c199b63180823198d38ec50d57b48dd85aca1ccc865058f85 gencode/java/udmi/schema/GatewayConfig.java
56b46f4914ef1f4baa59bf597186ff7901b7c8b607720ec798f4e4e6ad59aa08 gencode/java/udmi/schema/GatewayModel.java
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910c68183db7703b00bcb81146ad73e6fe0d4bbc4caec4dc9c621f3cc2e5eee5 gencode/java/udmi/schema/LocalnetModel.java
2df4ae32d0bbecc21f7c3f6a416a195baa766a6210cfa8abca4a7bb45b9c7961 gencode/java/udmi/schema/Location.java
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5e1c5411fae4d7c47391ceb5d19ae864fcd484df75ac6b6db39fd2d12647dec8 gencode/java/udmi/schema/Physical_tag.java
0868f0a9beb671dd08f066e7e7e796531fe151307a0b853b1f1a1aafe50ee746 gencode/java/udmi/schema/PointEnumerationEvent.java
Expand All @@ -48,20 +49,20 @@ a4e8f69100ab678a8236f481c558d677bbaea3e76c853bbd9262113d2a9c031d gencode/java/u
1372dc65268324a65a5854008b5dc5d2492328c145799dc4fda2a520e9f8198b gencode/java/udmi/schema/PointPointsetModel.java
db8d6dd3498019ad12e0f328b6237d07e52f133f8b08858b712611a52c198009 gencode/java/udmi/schema/PointPointsetState.java
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580dd48ce15879fcedf2150e9b87de99c3b6bdf3b631372b1391af048ba6771f gencode/java/udmi/schema/PointsetModel.java
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247652dd11714452adc27ffa542e3d5915f8e9b7b255d181723d6fe1e897b565 gencode/java/udmi/schema/SystemEvent.java
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04e5a1734f164edea681962debfa3e1f2c2ec09726fd9cc5a45848d76b8e16f4 gencode/python/udmi/schema/__init__.py
6578d68f65b87b781086e72566de910db4bef365599fe3188862d4d8a81e84fb gencode/python/udmi/schema/command_discovery.py
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b975892df78076dabc797b4c0be87f20b33eacda11f9d1ac1c09be33d4937a87 gencode/python/udmi/schema/config.py
Expand Down Expand Up @@ -105,4 +106,5 @@ a5a914cb5d74c29671a4d29dfa6c700b3fec27d695d607e28814ad31307e82da gencode/python
05e82aa15c64842e206ae8ce3d5810d115bb890d009ea5d657822fad0e0d2165 gencode/python/udmi/schema/state_gateway.py
3520ad936af70b414d9e7f90e606a011768bc4ee3bf1248714acc517ee9b393d gencode/python/udmi/schema/state_pointset.py
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22 changes: 11 additions & 11 deletions README.md
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Expand Up @@ -6,8 +6,8 @@ The Universal Device Management Interface (UDMI) provides a high-level specifica
management and operation of physical IoT systems. This data is typically exchanged
with a cloud entity that can maintain a "digital twin" or "shadow device" in the cloud.

* [Core UDMI documentation](docs/) for tools and specifications
* [Message schema definition](https://github.com/faucetsdn/udmi/tree/master/schema) with ([_🧬Interactive Viewer_](gencode/docs/))
* [Core UDMI documentation](http://faucetsdn.github.io/udmi/docs/) for tools and specifications
* [Message schema definition](https://github.com/faucetsdn/udmi/tree/master/schema) with ([_🧬Interactive Viewer_](http://faucetsdn.github.io/udmi/gencode/docs/)
* [[email protected]](https://groups.google.com/forum/#!forum/udmi-discuss) email discussion list
* Bi-weekly _UDMI Discuss_ video meeting open to all (join the mailing list to get an invite)

Expand All @@ -19,14 +19,14 @@ By design, this schema is intended to be:
* **M**anagement: Focus on device _management_, rather than command & control.
* **I**nterface: Define an interface specification, rather than a client-library or RPC mechanism.

See the associated [UDMI Tech Stack](docs/specs/tech_stack.md) for details about transport mechanism
See the associated [UDMI Tech Stack](http://faucetsdn.github.io/udmi/docs/specs/tech_stack.md) for details about transport mechanism
outside of the core schema definition. Nominally meant for use with
[Google's Cloud IoT Core](https://cloud.google.com/iot/docs/), it can be applied to any set
of data or hosting setup.

## Recommended Workflow

The [recommended workflow](docs/guides/workflow.md) for UDMI covers using the _registrar_ and
The [recommended workflow](http://faucetsdn.github.io/udmi/docs/guides/workflow.md) for UDMI covers using the _registrar_ and
_validator_ tools to configure and test a cloud project. Additionally, the _pubber_ tool
is instrumental in setting up and testing the system independent of actual device setup.

Expand All @@ -40,7 +40,7 @@ manual operation (aren't automated), and increase the security exposure of the s

UDMI is intended to support a few primary use-cases:
* _Telemetry Ingestion_: Ingest device data points in a standardized format.
* [_Gateway Proxy_](docs/specs/gateway.md): Proxy data/connection for non-UDMI devices,
* [_Gateway Proxy_](http://faucetsdn.github.io/udmi/docs/specs/gateway.md): Proxy data/connection for non-UDMI devices,
allowing adaptation to legacy systems.
* _On-Prem Actuation_: Ability to effect on-prem device behavior.
* _Device Testability_: e.g. Trigger a fake alarm to test reporting mechanisms.
Expand Down Expand Up @@ -83,10 +83,10 @@ very large structures or high-bandwidth streams.
UDMI provides a means to multiplex multiple functional subsystems through the same shared
communication channel. There are a number of subsystems that make up the core UDMI spec:

* Core [_system_](docs/messages/system.md) messages about the base device itself.
* Device [_pointset_](docs/messages/pointset.md) for device telemetry organized by points.
* Optional [_gateway_](docs/specs/gateway.md) functionality for proxying device/MQTT connections.
* Local [_discover_](docs/specs/discovery.md) for discovering device and network capabilities.
* Core [_system_](http://faucetsdn.github.io/udmi/docs/messages/system.md) messages about the base device itself.
* Device [_pointset_](http://faucetsdn.github.io/udmi/docs/messages/pointset.md) for device telemetry organized by points.
* Optional [_gateway_](http://faucetsdn.github.io/udmi/docs/specs/gateway.md) functionality for proxying device/MQTT connections.
* Local [_discover_](http://faucetsdn.github.io/udmi/docs/specs/discovery.md) for discovering device and network capabilities.

## Schema Structure

Expand Down Expand Up @@ -120,6 +120,6 @@ An interactive view of the schema is available on [https://faucetsdn.github.io/u
### Metadata Registration and Validation

Using UDMI on a project entails not only the base device and server implementations, but also
properly registering and validating device configuration. The [registrar](docs/tools/registrar.md)
tool and [validator](docs/tools/validator.md) tool provide a means to configure and check site
properly registering and validating device configuration. The [registrar](https://faucetsdn.github.io/udmi/docs/tools/registrar.md)
tool and [validator](https://faucetsdn.github.io/udmi/docs/tools/validator.md) tool provide a means to configure and check site
installations, respectively.
53 changes: 53 additions & 0 deletions docs/specs/sequences/config.md
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Expand Up @@ -13,6 +13,7 @@
* There is an update from internal logic
* Other [sequences](./) such as [writeback](writeback.md) may have specific behaviors relating to
state messages
* A device should of continuously operating when recieving an erroneous config message. The

![State and config](images/state.png)

Expand Down Expand Up @@ -40,4 +41,56 @@ Device->Broker: **STATE**
* `system`:
* `last_config`: Server-side timestamp from the last processed `config`.
* `updating`: Boolean indicating if the system is still processing the last `config` update.

## Erroneous Config Handling

A device should be capable of interpreting erroneous messages without distrupting operation. There are
three types of errors which may be encountered when interpreting config messages:
* Hard-errors
* Soft-errors
* Non-errors

This behavior is tested by the `config` [sequencer](../../tools/sequencer.md) tests.

### Hard-errors

Hard errors are ones such that the sanity of the entire config block is held in question, and
considered "invalid" at a core level. This can happen when:
* Only in response to config update message received
* Payload does not pass JSON parsing
* Missing "required" parameters (e.g. top-level version field)
* NOT by unrecognized extra JSON fields

When this happens, the device should:
* Keep the previous config (and use it) as a "steady state"
* The state system.last_update time should not be updated
* Appropriate error message included in system.statuses.config
* All other status blocks (pointset, etc…) should remain unaffected

## Soft-errors

Are things that can be safely relegated to a specific sub-block (e.g. pointset) without other areas
being affected. This can happen when:
* Invalid operations are indicated (e.g. writeback to non-writable point)
* There is no blanket conditions for all subblocks (just depends)
* Possibly independent of config (internal to device changes)
* Can happen to multiple subblocks independently

When this happens, the device should:
* Update system.last_config with last config.timestamp (config change)
* Indicate relevant error (most significant) in system.statuses.{subblock}
* Indicate more error detail (if any) in irrelevant state sunblock
* Include additional error information in log messages (if appropriate)
* Continue operating as best possible given the specified (invalid) config

## Non-Errors

There are some things that are specifically non-errors, and essentially meant to enable/help with
backwards compatibility. This can happen when:
* There is an extra unknown field in a config json message.

When this happens, the device should:
* Silently ignore the extra field(s) as if there was nothing wrong.
* Generally can be implemented by setting some JSON parsers to "ignore unrecognized fields"


1 change: 1 addition & 0 deletions docs/specs/sequences/readme.md
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Expand Up @@ -7,6 +7,7 @@ Sequences are defined device behavior which are formulated from a series of even
## Defined Sequences

- [Config and State](config.md)
- [Discovery](discovery.md)
- [Writeback](writeback.md)

## Validation
Expand Down
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