x

.gitignore

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+*.parquet

.vscode/settings.json

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+{
+    "python.analysis.autoImportCompletions": true,
+    "python.analysis.typeCheckingMode": "standard"
+}

main.py

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+from typing import (
+    Annotated,
+    AsyncGenerator,
+    Final,
+    Generator,
+    List,
+    Literal,
+    Optional,
+    Tuple,
+    TypeVar,
+    TypedDict,
+    Any,
+    cast,
+)
+
+from loguru import logger
+import numpy as np
+import plotly.graph_objects as go
+import streamlit as st
+import anyio
+from anyio.abc import TaskGroup
+from anyio import create_memory_object_stream
+from anyio.streams.memory import MemoryObjectSendStream, MemoryObjectReceiveStream
+from aiomqtt import Client as MqttClient, Message as MqttMessage
+from threading import Thread
+from time import sleep
+from pydantic import BaseModel, computed_field
+from datetime import datetime
+import awkward as ak
+from awkward import Array as AwkwardArray, Record as AwkwardRecord
+import orjson
+
+
+# https://handmadesoftware.medium.com/streamlit-asyncio-and-mongodb-f85f77aea825
+class AppState(TypedDict):
+    worker_thread: Thread
+    client: MqttClient
+    message_queue: MemoryObjectReceiveStream[MqttMessage]
+    task_group: TaskGroup
+
+
+MQTT_BROKER: Final[str] = "192.168.2.189"
+MQTT_BROKER_PORT: Final[int] = 1883
+TOPIC: Final[str] = "GwData"
+NDArray = np.ndarray
+
+T = TypeVar("T")
+
+
+def unwrap(value: Optional[T]) -> T:
+    if value is None:
+        raise ValueError("Value is None")
+    return value
+
+
+@st.cache_resource
+def resource(params: Any = None):
+    client: Optional[MqttClient] = None
+    tx, rx = create_memory_object_stream[MqttMessage]()
+    tg: Optional[TaskGroup] = None
+
+    async def main():
+        nonlocal tg
+        nonlocal client
+        tg = anyio.create_task_group()
+        async with tg:
+            client = MqttClient(MQTT_BROKER, port=MQTT_BROKER_PORT)
+            async with client:
+                await client.subscribe(TOPIC)
+                logger.info(
+                    "Subscribed {}:{} to topic {}", MQTT_BROKER, MQTT_BROKER_PORT, TOPIC
+                )
+                # https://aiomqtt.bo3hm.com/subscribing-to-a-topic.html
+                async for message in client.messages:
+                    await tx.send(message)
+
+    tr = Thread(target=anyio.run, args=(main,))
+    tr.start()
+    sleep(0.1)
+    state: AppState = {
+        "worker_thread": tr,
+        "client": unwrap(client),
+        "message_queue": rx,
+        "task_group": unwrap(tg),
+    }
+    return state
+
+
+class GwMessage(TypedDict):
+    v: int
+    mid: int
+    time: int
+    ip: str
+    mac: str
+    devices: list[Any]
+    rssi: int
+
+
+class DeviceMessage(BaseModel):
+    mac: str
+    """
+    Hex string, capital letters, e.g. "D6AF1CA9C491"
+    """
+    service: str
+    """
+    Hex string, capital letters, e.g. "180D"
+    """
+    characteristic: str
+    """
+    Hex string, capital letters, e.g. "2A37"
+    """
+    value: str
+    """
+    Hex string, capital letters, e.g. "0056"
+    """
+    rssi: int
+
+    @property
+    def value_bytes(self) -> bytes:
+        return bytes.fromhex(self.value)
+
+
+def get_device_data(message: GwMessage) -> List[DeviceMessage]:
+    """
+    devices
+
+    [[5,"D6AF1CA9C491","180D","2A37","0056",-58],[5,"A09E1AE4E710","180D","2A37","0055",-50]]
+
+    unknown, mac addr, service, characteristic, value (hex), rssi
+    """
+    l: list[DeviceMessage] = []
+    for d in message["devices"]:
+        x, mac, service, characteristic, value, rssi = d
+        l.append(
+            DeviceMessage(
+                mac=mac,
+                service=service,
+                characteristic=characteristic,
+                value=value,
+                rssi=rssi,
+            )
+        )
+    return l
+
+
+def payload_to_hr(payload: bytes) -> int:
+    """
+    ignore the first byte, parse the rest as a big-endian integer
+
+    Bit 0 (Heart Rate Format)
+        0: Heart rate value is 8 bits
+        1: Heart rate value is 16 bits
+    Bit 3 (Energy Expended)
+        Indicates whether energy expended data is present
+    Bit 4 (RR Interval)
+        Indicates whether RR interval data is present
+    """
+    flags = payload[0]
+    if flags & 0b00000001:
+        return int.from_bytes(payload[1:3], "big")
+    else:
+        return payload[1]
+
+
+def main():
+    state = resource()
+    logger.info("Resource created")
+    history: dict[str, AwkwardArray] = {}
+
+    MAX_LENGTH = 500
+
+    def push_new_message(message: GwMessage):
+        dms = get_device_data(message)
+        now = datetime.now()
+        for dm in dms:
+            rec = AwkwardRecord(
+                {
+                    "time": now,
+                    "value": payload_to_hr(dm.value_bytes),
+                    "rssi": dm.rssi,
+                }
+            )
+            if dm.mac not in history:
+                history[dm.mac] = AwkwardArray([rec])
+            else:
+                history[dm.mac] = ak.concatenate([history[dm.mac], [rec]])
+                if len(history[dm.mac]) > MAX_LENGTH:
+                    history[dm.mac] = AwkwardArray(history[dm.mac][-MAX_LENGTH:])
+
+    def on_export():
+        now = datetime.now()
+        filename = f"export-{now.strftime('%Y-%m-%d-%H-%M-%S')}.parquet"
+        ak.to_parquet([history], filename)
+        logger.info("Export to {}", filename)
+
+    export_btn = st.button(
+        "Export", help="Export the current data to a parquet file", on_click=on_export
+    )
+    pannel = st.empty()
+    while True:
+        try:
+            message = state["message_queue"].receive_nowait()
+        except anyio.WouldBlock:
+            continue
+        m: str
+        if isinstance(message.payload, str):
+            m = message.payload
+        elif isinstance(message.payload, bytes):
+            m = message.payload.decode("utf-8")
+        else:
+            logger.warning("Unknown message type: {}", type(message.payload))
+            continue
+        d = cast(GwMessage, orjson.loads(m))
+        push_new_message(d)
+
+        def to_scatter(key: str, dev_history: AwkwardArray):
+            x = ak.to_numpy(dev_history["time"])
+            y = ak.to_numpy(dev_history["value"])
+            return go.Scatter(x=x, y=y, mode="lines+markers", name=key)
+
+        scatters = [to_scatter(k, el) for k, el in history.items()]
+        fig = go.Figure(scatters)
+        pannel.plotly_chart(fig)
+
+
+if __name__ == "__main__":
+    main()
+
+# 1659A202

parse_exported.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import awkward as ak"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "name": "python",
+   "version": "3.12.7"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}