uns-kit 0.0.3

Lightweight Python UNS MQTT client (pub/sub + infra topics)

uns-kit (Python)

Lightweight UNS MQTT client for Python. Provides:

• Topic builder compatible with UNS infra topics (uns-infra/<package>/<version>/<process>/).
• Async publish/subscribe via MQTT v5 (using asyncio-mqtt).
• Infra status topics (alive, uptime) with MQTT will.
• Minimal UNS packet builder/parser (data/table).

Install (editable)

cd packages/uns-py
poetry install

CLI

After poetry install, an uns-kit-py command is available (renamed to avoid clashing with the Node CLI):

poetry run uns-kit-py publish --host localhost:1883 --topic raw/data/ --value 1
poetry run uns-kit-py subscribe --host localhost:1883 --topic 'uns-infra/#'
poetry run uns-kit-py write-config --path config.json

Quick start

import asyncio
from uns_kit import UnsMqttClient, TopicBuilder, UnsPacket

async def main():
    tb = TopicBuilder(package_name="uns-kit", package_version="0.0.1", process_name="py-demo")
    client = UnsMqttClient(host="mqtt-broker", topic_builder=tb, reconnect_interval=1)
    await client.connect()

    # Subscribe
    async with client.messages("uns-infra/#") as messages:
        await client.publish_packet("raw/data/", UnsPacket.data(value=1, uom="count"))
        msg = await messages.__anext__()
        print(msg.topic, msg.payload.decode())

    await client.close()

asyncio.run(main())

Resilient subscriber

async for msg in client.resilient_messages("uns-infra/#"):
    print(msg.topic, msg.payload.decode())

Examples

• examples/publish.py — publish 5 data packets.
• examples/subscribe.py — resilient subscription with auto-reconnect.

Notes

• Default QoS is 0; will message is retained on <statusTopic>alive.
• Uptime is published every 10 seconds on <statusTopic>uptime.
• Packet shape mirrors the TypeScript core: {"version":1,"message":{"data":{...}},"sequenceId":0}.