560 lines
21 KiB
Python
560 lines
21 KiB
Python
#!/usr/bin/env python3
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####################################################
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"""
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BLE Temp Sensor Driver
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First part of this file is the driver itself
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Since it's intended to be used with a service that could run for months or more,
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it also has a robust test system included
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The two primary functions for interacting with the driver are:
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def scan_macs() -> List[str]:
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def sensor_data_query(mac_list: List[str]) -> List[dict]:
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A lot of this came from LLM assistance, including the next edited blurb:
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Async BLE reader for Xiaomi Mi temperature / humidity sensors.
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This module exposes a minimal public API that other apps can import:
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* `read_data` - async coroutine, returns SensorReading or None
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All heavy lifting is done in the async functions; the sync wrapper is only
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provided for convenience.
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"""
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####################################################
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import asyncio
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import subprocess
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import time
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import warnings, logging, sys
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warnings.filterwarnings("ignore")
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logging.getLogger('apscheduler').setLevel(logging.ERROR)
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from dataclasses import dataclass
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from typing import List, Optional
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from config import *
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from bleak import BleakClient, BleakScanner
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####################################################
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# Configuration
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####################################################
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MI_SERVICE_UUID = "ebe0ccb0-7a0a-4b0c-8a1a-6ff2997da3a6"
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TEMP_CHAR_UUID = "ebe0ccc1-7a0a-4b0c-8a1a-6ff2997da3a6"
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SCAN_TIMEOUT = 10.0 # seconds to scan for each MAC
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CONNECT_TIMEOUT = 20.0
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READ_TIMEOUT = 5.0
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SERVICE_DISCOVERY_TIMEOUT = 10.0
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DISCOVER_TIMEOUT = SCAN_TIMEOUT + 5.0 # Timeout for discovering device
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current_usb_id = None
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####################################################
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# Logging
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####################################################
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_logger = logging.getLogger(__name__)
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_logger.setLevel(logging.INFO)
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# Stream (stdout) handler - always present
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_stdout_handler = logging.StreamHandler(sys.stdout)
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_stdout_handler.setFormatter(
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logging.Formatter(
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fmt="%(asctime)s [%(levelname)s] %(message)s",
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datefmt="%H:%M:%S",
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)
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)
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_logger.addHandler(_stdout_handler)
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# finally create the log
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log = _logger
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####################################################
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# Data model
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####################################################
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@dataclass
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class SensorReading:
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"""Single Mi sensor reading."""
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mac: str
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temperature: float
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humidity: int
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########################################################################################################
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### BLE Driver functions
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########################################################################################################
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####################################################
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# BLE Helpers mined from the javascript
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# This magic is necessary and mysterious
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####################################################
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# Scan once for the given MAC and return its address if found
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async def _discover_device(mac: str) -> Optional[str]:
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try:
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devices = await asyncio.wait_for(
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BleakScanner.discover(timeout=SCAN_TIMEOUT),
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timeout=SCAN_TIMEOUT + 2.0, # give a small buffer over scan timeout
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)
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for d in devices:
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if d.address.lower() == mac.lower():
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log.info("Found device %s (%s)", d.name or d.address, d.address)
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return d.address
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log.warning("Device %s not found in scan", mac)
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except asyncio.TimeoutError:
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log.warning("Discover call timed out after %.1fs for %s", SCAN_TIMEOUT + 2.0, mac)
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except Exception as e:
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log.error(f"Dicvoere call failed - {e}")
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reset_adapter()
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if "AccessDenied" in str(e):
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restart_bt_service()
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return None
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# Don't question the ancient magic
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# This evidently will "Parse the 3-byte Mi packet into temperature & humidity."
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def _parse_sensor_data(raw: bytes) -> (float, int):
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sign = raw[1] & (1 << 7)
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temp = ((raw[1] & 0x7F) << 8 | raw[0])
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if sign:
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temp -= 32767
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temp = temp / 100.0
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hum = raw[2]
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return temp, hum
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####################################################
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# BLE device discovery function and helpers
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# Returns a list of MACs of sensors detected
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####################################################
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# This is the primary function for interacting with the sensor data through the driver
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# Provide it with a List of MACs and it will return a list of Sensor data
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def sensor_data_query(mac_list: List[str]) -> List[dict]:
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result = []
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for mac in mac_list:
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try:
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# The main function used here is read_data
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this_result = asyncio.run(read_data(mac))
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except Exception as e:
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log.error(f"Error reading BLE data - {e}")
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this_result = None
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if "org.freedesktop.DBus.Error.AccessDenied" in str(e):
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reset_adapter()
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# return result
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#if "argument of type 'BleakDBusError' is not iterable" in str(e):
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# reset_adapter()
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return result
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if this_result:
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result.append(
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{"name": mac, "temp": this_result.temperature, "humidity": this_result.humidity}
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)
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log.info(f"Data query complete - returning result")
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return result
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# This non-async helper function scans for MACs
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# Primary function to interact with this driver function
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def scan_macs() -> List[str]:
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log.info("Scanning for MACs:")
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new_macs = asyncio.run(_scan_once())
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log.info(f"Found {len(new_macs)} new MACs.")
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return new_macs
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# Scans nearby BT devices, return a list of detected MACs that pass the filter
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async def _scan_once() -> List[str]:
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log.info("Starting one-shot BLE scan (timeout = %.1fs)", SCAN_TIMEOUT)
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try:
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devices = await BleakScanner.discover(timeout=SCAN_TIMEOUT)
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except Exception as e:
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log.error(f"Error reading BLE data - {e}")
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this_result = None
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if "org.freedesktop.DBus.Error.AccessDenied" in str(e):
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return []
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# only return MACs for devices that pass the _is_match
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return [dev.address for dev in devices if _is_match(dev.address, dev.name)]
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# this function filters MACs for octets and model
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def _is_match(mac: str, name: str) -> bool:
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if name == "LYWSD03MMC":
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return mac.upper().startswith(MAC_PREFIX.upper())
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####################################################
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# Core async read functions
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# Mined directly from the javascript
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# This is the actual function that does the magic
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####################################################
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async def read_data(mac: str) -> Optional[SensorReading]:
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try:
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address = await asyncio.wait_for(
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_discover_device(mac),
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timeout=DISCOVER_TIMEOUT,
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)
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except asyncio.TimeoutError:
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log.warning("Device discovery timed out for %s after %.1fs", mac, DISCOVER_TIMEOUT)
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return None
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if not address:
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return None
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try:
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async with BleakClient(address, timeout=CONNECT_TIMEOUT) as client:
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# NEW BLOCK ----------------------------------------------
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try:
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await asyncio.wait_for(client.get_services(),
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timeout=SERVICE_DISCOVERY_TIMEOUT)
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except asyncio.TimeoutError:
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log.warning("Service discovery timed out for %s", mac)
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return None
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except Exception as e:
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log.error(f"Discovery failed - {e}")
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####################################################
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# If we get here, services are available.
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####################################################
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if MI_SERVICE_UUID.lower() not in (
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s.uuid.lower() for s in client.services
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):
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log.error("Mi service not found on %s", mac)
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return None
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raw = await asyncio.wait_for(
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client.read_gatt_char(TEMP_CHAR_UUID),
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timeout=READ_TIMEOUT,
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)
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temp, hum = _parse_sensor_data(raw)
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log.info("Read from %s: %.1f°C, %d%%", mac, temp, hum)
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return SensorReading(mac=mac, temperature=temp, humidity=hum)
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except asyncio.TimeoutError:
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# This is the *connect* timeout (BleakClient)
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log.error("Connection to %s timed out after %.1fs", mac, CONNECT_TIMEOUT)
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except Exception as exc:
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log.exception("Error reading from %s: %s", mac, exc)
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return None
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########################################################################################################
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### Test Function Section
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### This runs a single full test of the driver
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### This two-step process first runs a single scan
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### Then, it scans the list until all devices have been scanned
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########################################################################################################
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def test_driver(test_count = 0, bt_usb_id = None):
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# if this happens then this needs to fail
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if bt_usb_id == None:
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log.error(f"Error - no USB ID Passed, this is needed for the test")
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return -1
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####################################################
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# first test - scanner function
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# the scanner function scans for compatible devices in range
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# this is pretty simple
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####################################################
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test_loop_count = 0
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found_macs = scan_macs()
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log.info("Found these MACs on a scan:")
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log.info(found_macs)
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####################################################
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# second test - scan devices for data
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# the primary function to perform this task is sensor_data_query
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# that runs a single scan and returns a list of sensor data dicts
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# this test runs that task as many times as it takes
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# to get all the MACs in the mac_list
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####################################################
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test_complete = False
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sensors = []
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mac_list = []
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# this gets MACs from the comment dict in config
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for mac in comment_lookup:
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mac_list.append(mac['mac'])
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log.info("Starting BLE test...")
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log.info(f" Scanning MACs: {mac_list}")
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# test_list shrinks with successful tests
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test_list = mac_list
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# for the history logic
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passed_list = []
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mac_history = []
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prev_list_snapshot = None
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####################################################
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# here is the big main test loop
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# only for second function
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# it loops until all MACs in mac_list are found
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####################################################
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while not test_complete:
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# Check if the failed list has been the same for reset_retries loops
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# If so, reset adapter and history
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if prev_list_snapshot is not None and passed_list == prev_list_snapshot:
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# List unchanged - add to mac_history
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mac_history.append(passed_list)
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else:
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# List changed - reset mac_history
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mac_history = []
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mac_history.append(passed_list)
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if len(mac_history) == reset_retries and all(lst == mac_history[0] for lst in mac_history):
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log.warning(f"Last {reset_retries} tests have been identical, resetting adapter")
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reset_adapter()
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mac_history = []
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prev_list_snapshot = passed_list
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# Preparing this scan loop
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log.info(f" Test run: {test_count} - loop {test_loop_count} start. Initializing run...")
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####################################################
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# Here the primary sensor_data_query query is executed
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####################################################
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test_run_results = sensor_data_query(test_list)
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# This all governs the loop logic and test variable handling
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test_loop_count = test_loop_count + 1
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for test_run_result in test_run_results:
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sensors.append(test_run_result)
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passed_list = [device["name"] for device in sensors]
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log.info(f" Passed list - {passed_list}")
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# If all the MACs have been scanned, then this test is complete.
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if len(mac_list) == len(passed_list):
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log.info(f" Test run {test_count} completed, yee-haw")
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print_sensor_data(sensors)
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test_complete = True
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result = {
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"found_macs": found_macs,
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"sensor_results": sensors
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}
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return result
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# If not, then re-scan the failed sensors
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else:
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log.warning(f" Test run incomplete/failed, attempt {len(mac_history)} of {reset_retries}, re-running, loop {test_loop_count}. Updating test list.")
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print_sensor_data(sensors)
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# here is where test_list might shrink
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test_list = get_failed_macs(mac_list, passed_list)
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log.warning(f" Re-do list - {test_list}")
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# end of the big main test loop and test_driver function
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####################################################
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# Various other helper functions
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####################################################
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# helper function for processing failed tests
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def get_failed_macs(mac_list, passed_list):
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mac_list_new = []
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for mac in mac_list:
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if mac not in passed_list:
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mac_list_new.append(mac)
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return mac_list_new
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# helper to print sensor data
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def print_sensor_data(sensors):
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for sensor in sensors:
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# Sorry I can't feel celcius, I want my freedom degrees
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log.info(f" {sensor['name']} - Temp: {temp_ctof(sensor['temp'])} | Humidity: {sensor['humidity']}")
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# yes i am an insufferable american that doesn't think in celcius, sue me
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def temp_ctof(c_temp):
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f_temp = (c_temp * 1.80) + 32.0
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return round(f_temp, 1)
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# This resets the BT adapter when things go caca
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def reset_adapter():
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log.info("Restting BT Adapter...")
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if len(current_usb_id) > 0:
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log.warning(f"Doing big reset - USB ID {current_usb_id}")
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log.info(subprocess.run(["usbreset", current_usb_id], capture_output=True, text=True, check=True).stdout.strip())
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time.sleep(2)
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else:
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log.warning("Hmm, this shouldn't happen, the current_usb_id is blank 0_o")
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log.info("Reset complete. ")
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# this restarts the bluetooth service
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def restart_bt_service():
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log.info("Resetting bluetooth.service...")
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log.info(subprocess.run(["systemctl", "stop", "bluetooth.service"], capture_output=True, text=True, check=True).stdout.strip())
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time.sleep(2)
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log.info(subprocess.run(["systemctl", "start", "bluetooth.service"], capture_output=True, text=True, check=True).stdout.strip())
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# this will return the USB ID based on systems scans
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def get_usb_id():
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present_usb_ids_command = "lsusb | awk '{print $6}'"
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# Capture each USB ID as a separate line
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present_usb_id_output = subprocess.run(
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present_usb_ids_command,
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shell=True,
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capture_output=True,
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text=True,
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check=True,
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).stdout.splitlines()
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result = ''
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# first let's see if it's already in the list
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for usb_id in present_usb_id_output:
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if usb_id in bt_usb_ids:
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result = usb_id
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# if it's not in the list, guess
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if len(result) == 0:
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result = usb_id_guess()
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return result
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# this will guess the USB ID if it's not found in the list
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def usb_id_guess():
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log.warning("USB ID Not found, I'll try and guess...")
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result = ''
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guess_command = "lsusb | grep -i blue | awk '{print $6'}"
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try:
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# Run the command in a shell because of the pipe
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output = subprocess.run(
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guess_command,
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shell=True,
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capture_output=True,
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text=True,
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check=True,
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).stdout.strip()
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result = output
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log.info(f"USB Best guess - {result}")
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except subprocess.CalledProcessError as exc:
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log.error(f"USB-ID guess failed: {exc}")
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return result
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# helper function to render BT device scan results for entire test
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def summarize_device_scan(test_result):
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mac_parts: List[str] = []
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for mac in sorted(test_result['test_result']['found_macs']):
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short_mac = ":".join(mac.split(":")[-2:])
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mac_parts.append(short_mac)
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found_macs_summary = " | ".join(mac_parts)
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result = f"Found {len(test_result['test_result']['found_macs'])} MACs - {found_macs_summary}"
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return result
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# helper function to summarize the full test results
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def summarize_test_results(test_result):
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parts: List[str] = []
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for reading in sorted(test_result['test_result']['sensor_results'], key=lambda r: r['name']):
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mac = reading['name']
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temp = reading['temp']
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# Grab the last two octets of the MAC address
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octets = mac.split(":")[-2:]
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short_mac = ":".join(octets)
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parts.append(f"{short_mac} - {temp:.1f}")
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result_summary = " | ".join(parts)
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return result_summary
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####################################################
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# If ble.py is run as a script, it will execute a test
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# Since I intend to run this driver for months at a time,
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# I need to do some robust long term tests on it
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# This entire main subroutine is dedicated to testing it
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####################################################
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if __name__ == "__main__":
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####################################################
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# initialize test
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####################################################
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# make a log file in temp
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import json
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from datetime import datetime
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logfile_path = f"/tmp/ble-test-{datetime.now().strftime('%y%m%d-%H%M%S')}.log"
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_file_handler = logging.FileHandler(logfile_path, mode="a")
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_file_handler.setLevel(logging.INFO) # same level (or tweak)
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_file_handler.setFormatter(_stdout_handler.formatter) # reuse formatter
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_logger.addHandler(_file_handler)
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log.info(f"Logfile initialized at {logfile_path}")
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# Make sure the test count value is passed
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if len(sys.argv) < 2:
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print("Usage: python3 test.py <count>")
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sys.exit(1)
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try:
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count = int(sys.argv[1])
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except ValueError:
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print("The count must be an integer.")
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sys.exit(1)
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# make sure bluetooth is unblocked in case something weird happened
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log.info("Unblocking Bluetooth")
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log.info(subprocess.run(["sudo", "rfkill", "unblock", "bluetooth"], capture_output=True, text=True, check=True).stdout.strip())
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time.sleep(2)
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# We need the usb id for all the resetting this has to do
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current_usb_id = get_usb_id()
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log.info(f"BLE USB ID Detected: {current_usb_id} - Resetting")
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# one last adapter reset before the test
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reset_adapter()
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####################################################
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# Beginning test
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####################################################
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# run the test
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test_count = 0
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test_results = []
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log.info(f"Starting BLE Test for {count} iterations")
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while test_count < count:
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test_count = test_count + 1
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this_test_result = []
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|
log.info(f"Starting test run {test_count} of {count}")
|
|
test_label = f"Test {test_count} result"
|
|
# it's tricky, the test run is called here inside the json
|
|
this_test_result = {
|
|
"test_label": test_label,
|
|
"test_result": test_driver(test_count = test_count, bt_usb_id = current_usb_id)
|
|
}
|
|
test_results.append(this_test_result)
|
|
|
|
# Show test results
|
|
log.info("Test run completed! Summary:")
|
|
for test_result in test_results:
|
|
# Which scan is this
|
|
log.info(f"{test_result['test_label']}:")
|
|
# Show summary of MACs found in this scan
|
|
log.info(summarize_device_scan(test_result))
|
|
# Show summary of Sensor data in this scan
|
|
log.info(summarize_test_results(test_result))
|
|
|
|
# This is the structure of test_results
|
|
# [
|
|
# {
|
|
# "test_label": test_label,
|
|
# "test_result": {
|
|
# "found_macs": found_macs,
|
|
# "sensor_results": [
|
|
# {
|
|
# "name": mac,
|
|
# "temp": this_result.temperature,
|
|
# "humidity": this_result.humidity
|
|
# },
|
|
# {
|
|
# "name": mac,
|
|
# "temp": this_result.temperature,
|
|
# "humidity": this_result.humidity
|
|
# }
|
|
# ]
|
|
# }
|
|
# },
|
|
# {
|
|
# "test_label": test_label,
|
|
# "test_result": {
|
|
# "found_macs": found_macs,
|
|
# "sensor_results": [
|
|
# {
|
|
# "name": mac,
|
|
# "temp": this_result.temperature,
|
|
# "humidity": this_result.humidity
|
|
# },
|
|
# {
|
|
# "name": mac,
|
|
# "temp": this_result.temperature,
|
|
# "humidity": this_result.humidity
|
|
# }
|
|
# ]
|
|
# }
|
|
# }
|
|
# ]
|
|
|
|
|