OpenFactory Commands Schemas#

Command envelope schema for OpenFactory command execution.

This module defines the CommandEnvelope and CommandHeader models used to standardize command messages exchanged between OpenFactory components (e.g., Core, Gateways, Applications).

The CommandEnvelope represents a structured command request including metadata (header) and named string-based arguments.

Design Principles:

  • Arguments are string-based.

  • Argument ordering, if needed, is handled by the receiving component (e.g., OPC UA gateway).

  • Identity and correlation metadata are carried in the header.

  • Strict schema validation is enforced (extra fields are forbidden).

Note

  • This schema defines the protocol structure only.

  • It does not implement authentication or signature validation.

  • Signature validation (if used) must be implemented at runtime level.

Warning

Signature validation is not yet implemented in OpenFactory and will be added in future. The presence of the signature field does not imply authentication or integrity verification at this stage.

Usage Example

Example JSON message:

{
  "header": {
    "correlation_id": "550e8400-e29b-41d4-a716-446655440000",
    "sender_uuid": "HMI-CNC-9207",
    "timestamp": "2026-02-21T12:00:00Z",
    "signature": null
  },
  "arguments": {
    "x": "10",
    "y": "20",
    "z": "30"
  }
}
class openfactory.schemas.command_header.CommandEnvelope(**data)[source]#

Bases: BaseModel

OpenFactory command request envelope.

The envelope contains a metadata header and a dictionary of named string arguments.

Parameters:

  • header (CommandHeader) – Metadata associated with the command.

  • arguments (Dict[str, str]) – Named string arguments passed to the receiving asset.

Note

  • All argument values are strings.

  • Argument ordering is resolved by the receiving gateway if required.

  • Unknown fields are rejected.

arguments: Dict[str, str]#
header: CommandHeader#
model_config = {'extra': 'forbid', 'str_strip_whitespace': True}#

Configuration for the model, should be a dictionary conforming to [ConfigDict][pydantic.config.ConfigDict].

class openfactory.schemas.command_header.CommandHeader(**data)[source]#

Bases: BaseModel

Metadata header for an OpenFactory command message.

Parameters:

  • correlation_id (UUID) – Unique identifier used to correlate request and response.

  • sender_uuid (UUID) – UUID of the requesting asset.

  • timestamp (datetime) – Time at which the command was issued (UTC).

  • signature (Optional[str]) – Optional cryptographic signature for authentication purposes. Validation is performed at runtime, not at schema level.

correlation_id: UUID#
model_config = {'extra': 'forbid', 'str_strip_whitespace': True}#

Configuration for the model, should be a dictionary conforming to [ConfigDict][pydantic.config.ConfigDict].

sender_uuid: str#
signature: str | None#
timestamp: datetime#