mirabox-stream-dock-sdk 0.2.0

Typed Python SDK for building MiraBox Stream Dock plugins

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MiraBox Stream Dock SDK

A typed Python SDK for building MiraBox Stream Dock plugins

Build reusable actions for keys, touch panels, and dials
without hand-writing the Stream Dock WebSocket protocol.

Quick start · PyPI · Example plugin · Protocol · API · Development

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About

mirabox-stream-dock-sdk provides the protocol, runtime, and browser-side tools needed to build Python plugins for MiraBox Stream Dock. It validates launch arguments and incoming messages, creates one typed action instance per visible control, dispatches lifecycle events, and serializes commands back to the Stream Dock application.

The SDK was originally developed as part of a Stream Dock plugin. It was later extracted into a standalone project so the protocol and runtime could be reused across plugins, tested independently, and evolved as a public package. The SDK will continue to be improved as it is used in real plugins and more Stream Dock behavior is verified.

[!IMPORTANT] The project is currently in the 0.x series. It is ready for experimentation and real plugin development, but public APIs may evolve between minor releases before 1.0.

[!NOTE] This is an unofficial community project and is not affiliated with or endorsed by MiraBox, HotSpot, or Elgato. The callback name connectElgatoStreamDeckSocket is retained because Stream Dock uses it for Property Inspector compatibility.

Table of contents

• Features
• How it works
• Requirements
• Installation
• Quick start
• Property Inspector client
• Counter example plugin
• Protocol basis
• API overview
• Errors and unknown events
• Logging
• Project structure
• Development
• Releasing

Features

	Feature	What it provides
🧩	Typed protocol	Dataclass models for registration, commands, and key, touch, dial, device, application, and settings events.
🧭	Precise validation	Malformed payloads report the event name and exact JSON field path that failed validation.
🎛️	Action runtime	One action instance per Stream Dock context, declarative UUID registration, and automatic lifecycle dispatch.
🔌	WebSocket transport	Registration, message parsing, command serialization, logging, and graceful shutdown.
🗃️	Typed settings	Pluggable codecs for action settings, global settings, and Property Inspector messages.
🖥️	Property Inspector	A versioned, dependency-free JavaScript client with connection state, events, settings helpers, and queued startup messages.
🧰	Plugin services	Start and stop plugin-owned background services in a predictable order.
📦	Distribution tooling	A CLI resource copier, PyInstaller example, package verification, CI, and Trusted Publishing workflow.
🛡️	Forward compatibility	Unknown but valid events can be preserved as UnknownStreamDockEvent instead of breaking the plugin.

How it works

flowchart LR
    App["MiraBox Stream Dock<br>Windows"] <-->|"WebSocket · JSON"| Connection["WebSocketStreamDockConnection"]
    Connection --> Runtime["StreamDockPlugin<br>event dispatcher"]
    Registry["ActionRegistry<br>UUID → Action class"] --> Runtime
    Runtime --> Actions["Action instances<br>one per context"]
    Runtime --> Services["Lifecycle services"]
    PI["Property Inspector<br>HTML / JavaScript"] <-->|"settings and messages"| App
    Client["MiraBoxPropertyInspector<br>browser client"] --> PI

Stream Dock starts the packaged plugin executable with the WebSocket port, plugin UUID, registration event, and application metadata. run_plugin_cli() parses those arguments, while StreamDockPlugin registers the plugin and maps incoming events to the appropriate action instance.

Requirements

• Python 3.11+;
• MiraBox Stream Dock 2.10.179.426 or newer (declared minimum);
• websocket-client>=1.8,<2 (installed automatically);
• Windows to run Stream Dock and package a standalone plugin with PyInstaller.

The SDK's Stream Dock integration has been manually verified with Stream Dock 3.10.203.0701.

The SDK itself and its test suite can be developed on Windows, Linux, or WSL. The final .exe must be built on Windows because PyInstaller is not a cross-compiler.

Installation

Install the released package from PyPI:

python -m pip install mirabox-stream-dock-sdk

To work on the SDK from source:

git clone https://github.com/Nekit678/MiraboxStreamDockSDK.git
cd MiraboxStreamDockSDK
python -m venv .venv

Windows PowerShell

.venv\Scripts\Activate.ps1
python -m pip install --upgrade pip
python -m pip install -e ".[dev]"

Linux / WSL

source .venv/bin/activate
python -m pip install --upgrade pip
python -m pip install -e ".[dev]"

Quick start

Define dependencies shared by your action instances, register each action UUID, and return a configured StreamDockPlugin from the application factory:

from __future__ import annotations

from dataclasses import dataclass

from mirabox_sdk import (
    Action,
    ActionRegistry,
    JsonObject,
    KeyDownEvent,
    PluginLaunchArguments,
    StreamDockPlugin,
    StreamDockSender,
    WebSocketStreamDockConnection,
    WillAppearEvent,
    run_plugin_cli,
)

ACTION_UUID = "com.example.counter.increment"


@dataclass(frozen=True, slots=True)
class Dependencies:
    stream_dock: StreamDockSender


registry: ActionRegistry[Dependencies] = ActionRegistry()


@registry.register(ACTION_UUID)
class CounterAction(Action[JsonObject, Dependencies]):
    def _render(self) -> None:
        count = self.settings.get("count", 0)
        self.set_title(str(count if type(count) is int else 0))

    def on_will_appear(self, _event: WillAppearEvent) -> None:
        self._render()

    def on_key_down(self, _event: KeyDownEvent) -> None:
        count = self.settings.get("count", 0)
        self.set_settings({"count": (count if type(count) is int else 0) + 1})
        self._render()


def build_application(arguments: PluginLaunchArguments) -> StreamDockPlugin[Dependencies]:
    connection = WebSocketStreamDockConnection(arguments.port)
    return StreamDockPlugin(
        arguments,
        stream_dock=connection,
        action_registry=registry,
        action_dependencies=Dependencies(connection),
    )


if __name__ == "__main__":
    raise SystemExit(run_plugin_cli(build_application))

The exact same action UUID must appear in the plugin's manifest.json. Stream Dock creates and removes action contexts through willAppear and willDisappear; the runtime manages the corresponding Python instances.

Action callbacks

Override only the callbacks an action needs:

Input or lifecycle	Action callback
Action becomes visible or disappears	on_will_appear, on_will_disappear
Key press or release	on_key_down, on_key_up
Touch panel tap	on_touch_tap
Dial press, release, or rotation	on_dial_down, on_dial_up, on_dial_rotate
Settings or title parameters change	on_did_receive_settings, on_title_parameters_did_change
Property Inspector opens, closes, or sends data	on_property_inspector_did_appear, on_property_inspector_did_disappear, on_send_to_plugin
Device, application, and wake-up notifications	on_device_did_connect, on_device_did_disconnect, on_application_did_launch, on_application_did_terminate, on_system_did_wake_up

Action helper methods cover the common outbound commands: set_title(), set_image(), set_state(), set_settings(), get_settings(), show_ok(), show_alert(), open_url(), log_message(), and send_to_property_inspector().

Typed settings

Actions use JSON objects by default. To work with an application-specific type, provide a JsonCodec on the action class:

from dataclasses import dataclass

from mirabox_sdk import Action, FunctionalJsonCodec, JsonObject


@dataclass(frozen=True, slots=True)
class CounterSettings:
    count: int


def decode_settings(value: JsonObject) -> CounterSettings:
    count = value.get("count", 0)
    if type(count) is not int:
        raise ValueError("count must be an integer")
    return CounterSettings(count)


COUNTER_SETTINGS_CODEC = FunctionalJsonCodec(
    decoder=decode_settings,
    encoder=lambda value: {"count": value.count},
)


class CounterAction(Action[CounterSettings, Dependencies]):
    settings_codec = COUNTER_SETTINGS_CODEC

The codec boundary verifies that encoded values are valid JSON. Decode errors are wrapped with the relevant event name and settings path.

Property Inspector client

Copy the JavaScript client shipped with the installed SDK into the plugin bundle:

mirabox-sdk copy-property-inspector \
  com.example.counter.sdPlugin/property-inspector

The command refuses to overwrite a different copy by default. Pass --force when intentionally updating the bundled client.

Load it before the action-specific script:

<script src="mirabox-sdk.js"></script>
<script src="counter.js"></script>

Stream Dock invokes the compatibility callback automatically. The action script uses the shared client through window.MiraBoxPropertyInspector:

const client = window.MiraBoxPropertyInspector;

client.on("connected", ({ settings }) => {
  console.log("Current settings", settings);
});

client.on("didReceiveSettings", ({ payload }) => {
  console.log("Updated settings", payload.settings);
});

client.sendToPlugin({ event: "refresh" });
client.updateSettings({ mode: "toggle" });

The client exposes on(), off(), send(), sendToPlugin(), setSettings(), updateSettings(), and getSettings(), plus connection and registration state. Messages sent while the WebSocket is connecting are queued until it opens.

Counter example plugin

examples/counter_plugin is a complete plugin rather than an isolated code fragment. It includes:

• a package with a registered counter action;
• a Property Inspector that can reset the counter;
• a valid .sdPlugin bundle and manifest;
• SVG assets and a PyInstaller specification;
• tests for the plugin behavior.

Build its executable on Windows:

python -m pip install pyinstaller
python -m PyInstaller --clean --noconfirm examples/counter_plugin/build.spec
Copy-Item dist\CounterPlugin.exe `
  examples\counter_plugin\com.example.counter.sdPlugin\

Copy the resulting com.example.counter.sdPlugin directory to %APPDATA%\HotSpot\StreamDock\plugins\ and restart Stream Dock. See the example guide for a source-run command and the complete packaging flow.

Protocol basis

This package is an independent, typed Python implementation of the WebSocket / JSON plugin API published by MiraBox. The primary upstream sources are:

• the official StreamDock Plugin SDK repository, including its Python template;
• the official registration procedure, received events, and events sent reference;
• the official manifest.json reference and Property Inspector guide;
• the upstream template overview on DeepWiki for secondary, generated explanations of the repository;
• the Space Platform for publishing completed Stream Dock plugins.

The local protocol map connects each supported wire event and command to its Python model or helper and calls out behavior verified in Stream Dock but not currently listed in the upstream event reference. When the published documentation and observed runtime behavior differ, tests record the behavior implemented by this SDK.

API overview

Area	Public API
Runtime	Action, ActionRegistry, StreamDockPlugin, LifecycleService
Connection	WebSocketStreamDockConnection, StreamDockConnection, StreamDockSender, StreamDockListener
Launch and registration	PluginLaunchArguments, registration dataclasses, parse_plugin_cli_arguments, run_plugin_cli
Input events	Typed models for key, touch, dial, settings, Property Inspector, device, application, and system events
Output commands	Registration, settings, title, image, state, feedback, URL, log, and Property Inspector command models
Application data	JsonCodec, FunctionalJsonCodec, JsonObjectCodec, typed encode/decode helpers
Resources	copy_property_inspector_client, property_inspector_client_bytes, mirabox-sdk CLI
Parsing	parse_stream_dock_event, parse_registration_info, typed protocol errors
Logging	configure_logging with isolated console, file, and disable controls

The supported public surface is exported from mirabox_sdk. Objects from individual modules should be treated as implementation details unless they are also exported there.

Errors and unknown events

Exception	Meaning
InvalidPluginLaunchArgumentsError	Stream Dock did not provide valid executable arguments.
InvalidRegistrationInfoError	The registration metadata JSON has an invalid field.
MalformedEventError / InvalidFieldError	A known event is malformed; the error includes its JSON path.
UnsupportedEventError	An unknown event was parsed with allow_unknown=False.
JsonCodecDecodeError	Plugin-owned settings or messages could not be decoded.
JsonCodecEncodeError	A codec produced a value that cannot be sent as JSON.

By default, parse_stream_dock_event() preserves an unknown but structurally valid envelope as UnknownStreamDockEvent. This lets the SDK tolerate protocol extensions while known events remain strictly validated.

Logging

SDK logging is disabled by default: it does not propagate to the application's root logger and does not create a log file. Enable diagnostics explicitly before calling run_plugin_cli():

from mirabox_sdk import configure_logging

configure_logging(level="INFO")

When enabled without a file, the destination is stderr. To write UTF-8 logs to a file, pass a path; missing parent directories are created automatically. File logging rotates at 5 MiB with three backups by default:

from pathlib import Path

from mirabox_sdk import configure_logging

configure_logging(
    level="DEBUG",
    log_file=Path.home() / ".mirabox-counter" / "plugin.log",
    max_bytes=5 * 1024 * 1024,
    backup_count=3,
)

Adjust max_bytes and backup_count for the plugin's needs. Set max_bytes=0 only when intentionally requesting an unbounded file.

Repeated calls replace the handler previously installed by configure_logging(), so the level or destination can be changed without duplicating messages. Return the SDK to its default silent state with:

configure_logging(enabled=False)

INFO records contain protocol direction, event, and context. DEBUG adds routing metadata, but message payloads remain redacted at every level. Handlers installed manually by the application remain its responsibility.

Project structure

MiraboxStreamDockSDK/
├── pyproject.toml                     # Package metadata and tool configuration
├── src/mirabox_sdk/
│   ├── action.py                      # Reusable action base class
│   ├── action_registry.py             # Action UUID registry
│   ├── commands.py                    # Typed outbound commands
│   ├── events.py                      # Typed inbound event models
│   ├── parser.py                      # Strict wire-message parser
│   ├── plugin.py                      # Runtime and lifecycle dispatcher
│   ├── connection.py                  # WebSocket transport
│   ├── logging_config.py              # Isolated SDK logging configuration
│   └── property_inspector/            # Browser-side SDK resource
├── examples/counter_plugin/           # Complete buildable plugin
├── tests/                             # SDK and release-tool tests
├── scripts/                           # Version and distribution verification
└── .github/workflows/                 # CI and Trusted Publishing release jobs

Development

Install the development dependencies, then run the same checks as CI:

python -m unittest discover -s tests -v
PYTHONPATH=examples/counter_plugin/src \
  python -m unittest discover -s examples/counter_plugin/tests -v
python -m compileall -q src tests scripts examples
ruff check src tests scripts examples
ruff format --check src tests scripts examples
python -m build
python scripts/verify_distribution.py dist
python -m twine check dist/*

The test suite uses fake connections and protocol messages; it does not require a running Stream Dock instance. CI runs the SDK on Linux and Windows across all supported Python versions.

Contributions are welcome. Please read CONTRIBUTING.md before submitting a change, and include the Stream Dock version and a regression test when changing observed protocol behavior.

Releasing

Releases are built from version tags, published to PyPI through Trusted Publishing, and attached to a generated GitHub Release. The required one-time configuration and release checklist are documented in RELEASING.md.

License

Distributed under the MIT License.

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Built for reusable Python plugins on MiraBox Stream Dock.