plexus-python 0.3.0

Thin Python SDK for Plexus — send telemetry in one line

plexus-python

Thin Python SDK for Plexus. Send telemetry to the Plexus gateway in one line. Storage, dashboards, alerts, and fleet management live in the platform — this package just ships your data.

Quick Start

pip install plexus-python

from plexus import Plexus

px = Plexus(api_key="plx_xxx", source_id="device-001")
px.send("temperature", 72.5)

Get an API key at app.plexus.company → Devices → Add Device.

Usage

from plexus import Plexus

px = Plexus(source_id="rig-01")   # reads PLEXUS_API_KEY from env

# Numbers
px.send("engine.rpm", 3450)
px.send("coolant.temperature", 82.3, tags={"unit": "C"})

# Strings, bools, objects, arrays — all JSON-serializable
px.send("vehicle.state", "RUNNING")
px.send("motor.enabled", True)
px.send("position", {"x": 1.5, "y": 2.3, "z": 0.8})

# Batch
px.send_batch([
    ("temperature", 72.5),
    ("pressure", 1013.25),
])

# Named run for grouping related data
with px.run("thermal-cycle-001"):
    while running:
        px.send("temperature", read_temp())

Bring Your Own Protocol

This package ships no adapters, auto-detection, or daemons — just the client. Use whatever library you'd use anyway and pipe values into px.send().

# MAVLink (pymavlink)
for msg in conn:
    if msg.get_type() == "ATTITUDE":
        px.send("attitude.roll", msg.roll)

# CAN (python-can)
for msg in bus:
    px.send(f"can.0x{msg.arbitration_id:x}", int.from_bytes(msg.data, "big"))

# MQTT (paho-mqtt)
def on_message(_c, _u, msg):
    px.send(msg.topic.replace("/", "."), float(msg.payload))

# I2C sensor (Adafruit CircuitPython)
px.send("temperature", bme.temperature)

See examples/ for runnable versions of each.

Reliability

Every send buffers locally before hitting the network, retries with exponential backoff, and keeps your data safe across outages. Enable SQLite persistence to survive restarts and power loss:

px = Plexus(persistent_buffer=True)

Point counts and flush:

px.buffer_size()
px.flush_buffer()

Transport

By default the SDK connects over a WebSocket to /ws/device on the gateway — same wire protocol as the C SDK. This gives you:

• lower-latency streaming of telemetry,
• live command delivery from the UI / API to the device.

If the socket is unavailable, sends transparently fall back to POST /ingest so no data is lost.

# default — ws with http fallback
px = Plexus()

# force http (legacy)
px = Plexus(transport="http")

Handling commands

Register a handler before the first send() so the command is advertised in the auth frame:

def reboot(name, params):
    delay = params.get("delay_s", 0)
    # ... reboot logic ...
    return {"ok": True, "delay": delay}

px = Plexus()
px.on_command("reboot", reboot, description="reboot the device")
px.send("temperature", 72.5)   # opens the socket, waits for auth

The SDK sends an ack frame before invoking the handler, then a result frame with whatever the handler returns (or an error frame if it raises).

Environment Variables

Variable	Description	Default
PLEXUS_API_KEY	API key (required)	none
PLEXUS_GATEWAY_URL	HTTP ingest URL	https://plexus-gateway.fly.dev
PLEXUS_GATEWAY_WS_URL	WebSocket URL	wss://plexus-gateway.fly.dev

Architecture

Your code ── px.send() ── HTTP POST /ingest ──> plexus-gateway ──> ClickHouse + Dashboard

One thin path. No agent, no daemon, no adapters. If you want the full HardwareOps platform — dashboards, alerts, RCA, fleet views — that's the web UI at app.plexus.company. This package gets your data there.

License

Apache 2.0