Let a connector write, and publish strings bare

Two things stopped the engine commanding this house. ConnectorNode hardwired
its node function to a no-op, so an input message reaching a connector was
discarded and Art-Net's packet builder was unreachable; write() now carries
the input ports, which is additive so the contract version holds. And the MQTT
publisher JSON-encoded every payload, so "ON" went on the wire quoted and the
devices on a shared broker, which speak bare values, ignored it.

seed_house_control.py is the rig: a flow that drives the washing machine plug,
a dimmer and a colour fixture over MQTT, carries the same two as DMX on an
Art-Net node with transmit still off, and a dashboard to drive it by hand.

scripts/seed_house_control.py

@@ -0,0 +1,459 @@
+#!/usr/bin/env python
+"""Seed the house write-path evaluation: one flow, one dashboard, real devices.
+
+This is the M4 write-path test rig. Node-RED drives this house today; the flow
+below speaks the same MQTT bus it does, and carries an Art-Net node aimed at
+the same gateway so the Node-RED-free path can be tried on the same fixtures.
+
+    house_control   inputs -> encoders -> mqtt out      commands three fixtures
+                    mqtt in -> meter                    what the house echoed
+                    inputs -> dmx -> artnet             the same two, direct
+
+What the reference does, and what this reproduces:
+
+    actor/washingMachinePlug   "ON" / "OFF"    -> DMX ch 33   (1CH Actor)
+    light/traverseSpotLight    0-100 raw       -> DMX ch 31   (1CH Light)
+    light/livingRoomAmbientLight  "[h,s,v]"    -> DMX ch 1-4  (4CH Light)
+
+Nothing is retained on that broker, so the echo the flow subscribes to is the
+only handshake there is: a value coming back is proof the broker took it.
+
+**The flow is seeded stopped.** Starting it publishes the current input values
+once, which is `OFF` for the plug and zero for both lights — start it with the
+washing machine idle.
+
+Run it against a stack that is already up::
+
+    make -C app seed-house
+
+Environment (the Makefile passes these):
+    API_URL, FIRST_SUPERUSER, FIRST_SUPERUSER_PASSWORD
+    HOUSE_BROKER, HOUSE_BROKER_USER, ARTNET_HOST
+"""
+
+from __future__ import annotations
+
+import os
+import sys
+from typing import Any
+
+import httpx
+
+API = os.environ.get("API_URL", "http://api.localhost")
+EMAIL = os.environ.get("FIRST_SUPERUSER", "")
+PASSWORD = os.environ.get("FIRST_SUPERUSER_PASSWORD", "")
+
+BROKER = os.environ.get("HOUSE_BROKER", "192.168.1.104")
+BROKER_USER = os.environ.get("HOUSE_BROKER_USER", "fluksio")
+ARTNET_HOST = os.environ.get("ARTNET_HOST", "192.168.1.12")
+
+SECRET = "mqtt_thcomp_password"
+FLOW = "house_control"
+PANEL = "house_control"
+
+PLUG_TOPIC = "actor/washingMachinePlug"
+SPOT_TOPIC = "light/traverseSpotLight"
+AMBIENT_TOPIC = "light/livingRoomAmbientLight"
+POWER_TOPIC = "shellypm/status/pm1:0"
+
+# Universe 1 on the gateway, the same channels the reference stamps in.
+DMX_PLUG = 33
+DMX_SPOT = 31
+
+PLUG_SOURCE = '''"""A relay speaks ON and OFF. Anything else lands on DMX as a string."""
+
+
+def process(wash):
+    return {"plug": "ON" if wash else "OFF"}
+'''
+
+SPOT_SOURCE = '''"""A single-channel dimmer takes the level raw.
+
+The reference hands 0-100 straight to DMX without scaling to 255, so a
+replacement that "fixes" that would be four times too bright.
+"""
+
+
+def process(spot):
+    return {"spot_level": max(0, min(100, int(spot)))}
+'''
+
+AMBIENT_SOURCE = '''"""The 4CH fixtures take "[h,s,v]" as text: hue 0-360, the rest 0-100."""
+
+
+def process(hue, level):
+    return {"ambient": f"[{int(hue)},80,{max(0, min(100, int(level)))}]"}
+'''
+
+METER_SOURCE = '''"""House power, so a plug switching is visible as a step rather than a claim.
+
+This is the whole house, not the one socket — the inventory has no per-plug
+metering. A washing machine still moves it by hundreds of watts.
+"""
+
+
+def process(power_raw):
+    return {"power": float(power_raw.get("apower", 0.0))}
+'''
+
+DMX_SOURCE = '''"""The same two commands as DMX levels, for the Node-RED-free path.
+
+Mirrors the reference's "1CH Actor" (ON -> 255) and "1CH Light" (level used
+raw). One node owns the universe, so both channels are set every run.
+"""
+
+
+def process(wash, spot):
+    return {
+        "dmx_wash": 255 if wash else 0,
+        "dmx_spot": max(0, min(255, int(spot))),
+    }
+'''
+
+
+def broker_params(client_id: str, topic: dict[str, str]) -> dict[str, Any]:
+    """One broker, one credential, a topic per port."""
+    return {
+        "topic": topic,
+        "broker_host": BROKER,
+        "broker_port": 1883,
+        "username": BROKER_USER,
+        "password": {"$secret": SECRET},
+        "client_id": client_id,
+        "qos": 0,
+        "retain": False,
+    }
+
+
+# One publisher per fixture on purpose: a node is handed every input it
+# requires on every run, so a single publisher would re-command the plug each
+# time a light slider moved.
+NODES = [
+    {
+        "id": "plug_cmd",
+        "type": "python",
+        "title": "Plug to ON/OFF",
+        "requires": [{"name": "wash", "dtype": "bool"}],
+        "provides": [{"name": "plug", "dtype": "str"}],
+    },
+    {
+        "id": "spot_cmd",
+        "type": "python",
+        "title": "Spot level",
+        "requires": [{"name": "spot", "dtype": "float"}],
+        "provides": [{"name": "spot_level", "dtype": "int"}],
+    },
+    {
+        "id": "ambient_cmd",
+        "type": "python",
+        "title": "Ambient colour",
+        "requires": [
+            {"name": "hue", "dtype": "float"},
+            {"name": "level", "dtype": "float"},
+        ],
+        "provides": [{"name": "ambient", "dtype": "str"}],
+    },
+    {
+        "id": "plug_out",
+        "type": "mqtt",
+        "title": "Washing machine plug",
+        "params": broker_params("fluksio-house-plug", {"plug": PLUG_TOPIC}),
+        "requires": [{"name": "plug", "dtype": "str"}],
+    },
+    {
+        "id": "spot_out",
+        "type": "mqtt",
+        "title": "Traverse spot",
+        "params": broker_params("fluksio-house-spot", {"spot_level": SPOT_TOPIC}),
+        "requires": [{"name": "spot_level", "dtype": "int"}],
+    },
+    {
+        "id": "ambient_out",
+        "type": "mqtt",
+        "title": "Living room ambient",
+        "params": broker_params("fluksio-house-ambient", {"ambient": AMBIENT_TOPIC}),
+        "requires": [{"name": "ambient", "dtype": "str"}],
+    },
+    {
+        "id": "echo",
+        "type": "mqtt",
+        "title": "What the house said back",
+        "params": broker_params(
+            "fluksio-house-echo",
+            {
+                "plug_state": PLUG_TOPIC,
+                "spot_state": SPOT_TOPIC,
+                "power_raw": POWER_TOPIC,
+            },
+        ),
+        "provides": [
+            {"name": "plug_state", "dtype": "str"},
+            {"name": "spot_state", "dtype": "float"},
+            {"name": "power_raw", "dtype": "json", "interval": 5.0},
+        ],
+    },
+    {
+        "id": "meter",
+        "type": "python",
+        "title": "House power",
+        "requires": [{"name": "power_raw", "dtype": "json"}],
+        "provides": [{"name": "power", "dtype": "float"}],
+    },
+    {
+        "id": "dmx",
+        "type": "python",
+        "title": "The same two, as DMX levels",
+        "requires": [
+            {"name": "wash", "dtype": "bool"},
+            {"name": "spot", "dtype": "float"},
+        ],
+        "provides": [
+            {"name": "dmx_wash", "dtype": "int"},
+            {"name": "dmx_spot", "dtype": "int"},
+        ],
+    },
+    {
+        "id": "artnet_out",
+        "type": "artnet",
+        "title": "Art-Net universe 1 (off the wire)",
+        "params": {
+            "host": ARTNET_HOST,
+            "universe": 1,
+            "channels": {"dmx_wash": DMX_PLUG, "dmx_spot": DMX_SPOT},
+            # Stays off until Node-RED's own sender is stopped: a frame carries
+            # the whole universe, so two senders overwrite each other.
+            "transmit": False,
+        },
+        "requires": [
+            {"name": "dmx_wash", "dtype": "int"},
+            {"name": "dmx_spot", "dtype": "int"},
+        ],
+    },
+]
+
+INPUTS = [
+    {"spec": {"name": "wash", "dtype": "bool"}, "initial": False},
+    {"spec": {"name": "spot", "dtype": "float"}, "initial": 0.0},
+    {"spec": {"name": "hue", "dtype": "float"}, "initial": 30.0},
+    {"spec": {"name": "level", "dtype": "float"}, "initial": 0.0},
+]
+
+SOURCES = {
+    "plug_cmd": PLUG_SOURCE,
+    "spot_cmd": SPOT_SOURCE,
+    "ambient_cmd": AMBIENT_SOURCE,
+    "meter": METER_SOURCE,
+    "dmx": DMX_SOURCE,
+}
+
+
+def msg(name: str) -> str:
+    return f"{FLOW}.{name}"
+
+
+WIDGETS = [
+    {
+        "id": "wash",
+        "type": "switch",
+        "title": "Washing machine plug",
+        "layout": {"lg": {"x": 0, "y": 0, "w": 3, "h": 2}},
+        "config": {"target": msg("wash"), "dtype": "bool", "style": "button"},
+    },
+    {
+        "id": "spot",
+        "type": "slider",
+        "title": "Traverse spot",
+        "layout": {"lg": {"x": 3, "y": 0, "w": 3, "h": 2}},
+        "config": {
+            "target": msg("spot"),
+            "dtype": "float",
+            "min": 0,
+            "max": 100,
+            "step": 5,
+            "unit": "%",
+        },
+    },
+    {
+        "id": "hue",
+        "type": "slider",
+        "title": "Ambient hue",
+        "layout": {"lg": {"x": 6, "y": 0, "w": 3, "h": 2}},
+        "config": {
+            "target": msg("hue"),
+            "dtype": "float",
+            "min": 0,
+            "max": 360,
+            "step": 10,
+            "unit": "°",
+        },
+    },
+    {
+        "id": "level",
+        "type": "slider",
+        "title": "Ambient brightness",
+        "layout": {"lg": {"x": 9, "y": 0, "w": 3, "h": 2}},
+        "config": {
+            "target": msg("level"),
+            "dtype": "float",
+            "min": 0,
+            "max": 100,
+            "step": 5,
+            "unit": "%",
+        },
+    },
+    {
+        "id": "plug_state",
+        "type": "stat",
+        "title": "Plug echoed back",
+        "layout": {"lg": {"x": 0, "y": 2, "w": 3, "h": 2}},
+        "config": {"message": msg("plug_state"), "dtype": "str"},
+    },
+    {
+        "id": "spot_state",
+        "type": "stat",
+        "title": "Spot echoed back",
+        "layout": {"lg": {"x": 3, "y": 2, "w": 3, "h": 2}},
+        "config": {
+            "message": msg("spot_state"),
+            "dtype": "float",
+            "precision": 0,
+            "unit": "%",
+        },
+    },
+    {
+        "id": "power",
+        "type": "chart",
+        "title": "House power",
+        "layout": {"lg": {"x": 6, "y": 2, "w": 6, "h": 5}},
+        "config": {
+            "series": [{"message": msg("power"), "dtype": "float", "label": "Total"}],
+            "history": {"points": 360},
+            "unit": " W",
+            "y_label": "W",
+        },
+    },
+    {
+        "id": "protocol",
+        "type": "markdown",
+        "title": "Test protocol",
+        "layout": {"lg": {"x": 0, "y": 4, "w": 6, "h": 5}},
+        "config": {
+            "content": (
+                "## Before you start\n"
+                "- The flow is seeded stopped. Starting it publishes the"
+                " current values once, which is OFF for the plug and zero for"
+                " both lights.\n"
+                "- Start it with the washing machine idle.\n"
+                "- Node-RED reacts to the plug going ON by scheduling an"
+                " automatic OFF at midnight. That is its logic, not a fault.\n"
+                "## What to try\n"
+                "- Plug: ON, then OFF. The stat beside it is the broker's"
+                " echo, and the chart should step by a few hundred watts.\n"
+                "- Traverse spot: 0, 60, 0. The number is used raw as the DMX"
+                " level, exactly as the reference does.\n"
+                "- Ambient: move brightness up, then hue. Back to zero when"
+                " done.\n"
+                "## Art-Net, once Node-RED is stopped\n"
+                "- The Art-Net node is on the canvas with transmit off. It"
+                " aims at the same gateway, universe 1, channels 33 and 31.\n"
+                "- A frame carries all 512 channels, so one sender owns a"
+                " universe. Stop Node-RED's Art-Net sender first, or the two"
+                " overwrite each other every second.\n"
+                "- Everything on that universe this node does not set goes"
+                " dark while it drives.\n"
+            )
+        },
+    },
+]
+
+
+class Api:
+    def __init__(self) -> None:
+        self.http = httpx.Client(base_url=f"{API}/api/v1", timeout=30)
+        token = self.http.post(
+            "/login/access-token",
+            data={"username": EMAIL, "password": PASSWORD},
+        ).json()["access_token"]
+        self.http.headers["Authorization"] = f"Bearer {token}"
+
+    def __call__(self, method: str, path: str, body: Any = None) -> Any:
+        response = self.http.request(method, path, json=body)
+        response.raise_for_status()
+        return response.json() if response.content else None
+
+    def drop(self, path: str) -> None:
+        """Delete something that may not be there."""
+        try:
+            self("DELETE", path)
+        except httpx.HTTPStatusError:
+            pass
+
+
+def main() -> int:
+    if not EMAIL or not PASSWORD:
+        print("FIRST_SUPERUSER / FIRST_SUPERUSER_PASSWORD are unset.", file=sys.stderr)
+        return 1
+
+    api = Api()
+
+    if SECRET not in api("GET", "/secrets/")["data"]:
+        print(
+            f"No secret named '{SECRET}'. Add the broker password under "
+            "Secrets, or point HOUSE_BROKER at a broker that takes anonymous "
+            "connections.",
+            file=sys.stderr,
+        )
+        return 1
+
+    api.drop(f"/flows/{FLOW}")
+    api(
+        "PUT",
+        f"/flows/{FLOW}",
+        {
+            "name": FLOW,
+            "title": "House control (evaluation)",
+            "nodes": NODES,
+            "inputs": INPUTS,
+        },
+    )
+    for node_id, code in SOURCES.items():
+        api("PUT", f"/flows/{FLOW}/nodes/{node_id}/source", {"code": code})
+    version = api("GET", f"/flows/{FLOW}")["definition"]["version"]
+    api("POST", f"/flows/{FLOW}/publish", {"version": version})
+
+    # Seeded stopped: nothing reaches the house until someone is watching.
+    api("POST", f"/flows/{FLOW}/stop")
+    print(f"  {FLOW}: {len(NODES)} nodes, published, stopped")
+
+    issues = api("POST", f"/flows/{FLOW}/validate")["issues"]
+    for issue in issues:
+        print(f"  ! {issue}")
+
+    api.drop(f"/dashboards/{PANEL}")
+    api("POST", f"/dashboards/{PANEL}")
+    current = api("GET", f"/dashboards/{PANEL}")
+    api(
+        "PUT",
+        f"/dashboards/{PANEL}",
+        {
+            **current,
+            "title": "House control",
+            "pages": [
+                {
+                    "id": "main",
+                    "title": "Write paths",
+                    "sections": [{"id": "main", "widgets": WIDGETS}],
+                }
+            ],
+        },
+    )
+    version = api("GET", f"/dashboards/{PANEL}?draft=true")["version"]
+    api("POST", f"/dashboards/{PANEL}/publish", {"version": version})
+    print(f"  dashboard '{PANEL}': published")
+
+    print(f"\nStart the flow, then open /view/{PANEL}.")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())