diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 8d29941..bf524b0 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -33,7 +33,7 @@ jobs:
 
       - name: Install Python modules
         run: |
-          pip install --constraint=.github/workflows/constraints.txt pre-commit black flake8 reorder-python-imports
+          pip install --constraint=.github/workflows/constraints.txt pre-commit black flake8 isort
 
       - name: Run pre-commit on all files
         run: |
diff --git a/.gitignore b/.gitignore
index 2f4cb75..22445ec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,5 @@ config/blueprint*
 config/.HA_VERSION
 config/configuration.yaml
 config/known_devices.yaml
+
+node_modules/.cache*
diff --git a/.isort.cfg b/.isort.cfg
new file mode 100644
index 0000000..d9e5b68
--- /dev/null
+++ b/.isort.cfg
@@ -0,0 +1,4 @@
+[settings]
+add_imports=from __future__ import annotations
+force_single_line=true
+profile=black
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 13b7d33..74d81e8 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,12 +1,13 @@
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.4.0
+    rev: v4.5.0
     hooks:
       - id: check-added-large-files
       - id: check-yaml
       - id: end-of-file-fixer
       - id: trailing-whitespace
-  - repo: local
+  - repo: https://github.com/psf/black
+    rev: 24.2.0
     hooks:
       - id: black
         name: black
@@ -14,19 +15,19 @@ repos:
         language: system
         types: [python]
         require_serial: true
+  - repo: local
+    hooks:
       - id: flake8
         name: flake8
         entry: flake8
         language: system
         types: [python]
         require_serial: true
-      - id: reorder-python-imports
-        name: Reorder python imports
-        entry: reorder-python-imports
-        language: system
-        types: [python]
-        args: [--application-directories=custom_components]
+  - repo: https://github.com/pycqa/isort
+    rev: 5.13.2
+    hooks:
+      - id: isort
   - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: v3.0.2
+    rev: v4.0.0-alpha.8
     hooks:
       - id: prettier
diff --git a/custom_components/__init__.py b/custom_components/__init__.py
index 9e5dc14..6f53023 100644
--- a/custom_components/__init__.py
+++ b/custom_components/__init__.py
@@ -1 +1,3 @@
 """Dummy init so that pytest works."""
+
+from __future__ import annotations
diff --git a/custom_components/bermuda/__init__.py b/custom_components/bermuda/__init__.py
index f7e1ad8..d23cf1e 100644
--- a/custom_components/bermuda/__init__.py
+++ b/custom_components/bermuda/__init__.py
@@ -4,20 +4,20 @@
 For more details about this integration, please refer to
 https://github.com/agittins/bermuda
 """
+
 from __future__ import annotations
 
 import asyncio
 import logging
 from datetime import datetime
 from datetime import timedelta
-from typing import TYPE_CHECKING
 
 import voluptuous as vol
 from homeassistant.components import bluetooth
+from homeassistant.components.bluetooth import MONOTONIC_TIME
 from homeassistant.components.bluetooth import BluetoothChange
 from homeassistant.components.bluetooth import BluetoothScannerDevice
 from homeassistant.components.bluetooth import BluetoothServiceInfoBleak
-from homeassistant.components.bluetooth import MONOTONIC_TIME
 from homeassistant.components.bluetooth.active_update_coordinator import (
     PassiveBluetoothDataUpdateCoordinator,
 )
@@ -25,10 +25,10 @@
 from homeassistant.const import STATE_HOME
 from homeassistant.const import STATE_NOT_HOME
 from homeassistant.const import STATE_UNAVAILABLE
-from homeassistant.core import callback
 from homeassistant.core import Config
 from homeassistant.core import HomeAssistant
 from homeassistant.core import SupportsResponse
+from homeassistant.core import callback
 from homeassistant.exceptions import ConfigEntryNotReady
 from homeassistant.helpers import area_registry
 from homeassistant.helpers import config_validation as cv
@@ -57,10 +57,12 @@
 from .const import SIGNAL_DEVICE_NEW
 from .const import STARTUP_MESSAGE
 
+# from typing import TYPE_CHECKING
+
 # from bthome_ble import BTHomeBluetoothDeviceData
 
-if TYPE_CHECKING:
-    from bleak.backends.device import BLEDevice
+# if TYPE_CHECKING:
+#     from bleak.backends.device import BLEDevice
 
 SCAN_INTERVAL = timedelta(seconds=5)
 
@@ -135,24 +137,34 @@ class BermudaPBDUCoordinator(
 
     Looks like this needs to be run through setup, with a specific
     BLEDevice (address) already specified, so won't do "all adverts"
+
+    We (plan to) use it to capture each monitored addresses' events so we can update more
+    frequently than UPDATE_INTERVAL, and respond in realtime.
+    The co-ordinator will create one of these for each device we create
+    sensors for, and this will just call the coordinator's update routine
+    whenever something changes.
+
+    WORK IN PROGRESS: this doesn't currently do anything.
     """
 
     def __init__(
         self,
         hass: HomeAssistant,
         logger: logging.Logger,
-        ble_device: BLEDevice,
+        address: str,
         device: BermudaDevice,
+        coordinator: BermudaDataUpdateCoordinator,
     ) -> None:
         """Init"""
         super().__init__(
             hass=hass,
             logger=logger,
-            address=ble_device.address,
-            mode=bluetooth.BluetoothScanningMode.ACTIVE,
+            address=address,
+            mode=bluetooth.BluetoothScanningMode.PASSIVE,
             connectable=False,
         )
         self.device = device
+        self.coordinator = coordinator
 
     @callback
     def _async_handle_unavailable(
@@ -164,6 +176,10 @@ def _async_handle_unavailable(
     def _async_handle_bluetooth_event(
         self, service_info: BluetoothServiceInfoBleak, change: BluetoothChange
     ) -> None:
+        _LOGGER.warning(
+            "Update triggered by device %s (this is a good thing)", self.device.name
+        )
+        self.coordinator.async_refresh()
         return super()._async_handle_bluetooth_event(service_info, change)
 
 
@@ -462,6 +478,7 @@ def __init__(
                     self.options[key] = val
 
         self.devices: dict[str, BermudaDevice] = {}
+        self.updaters: dict[str, BermudaPBDUCoordinator] = {}
 
         self.area_reg = area_registry.async_get(hass)
 
@@ -490,6 +507,11 @@ def sensor_created(self, address):
         dev = self._get_device(address)
         if dev is not None:
             dev.create_sensor_done = True
+            self.updaters[address] = pduc = BermudaPBDUCoordinator(
+                self.hass, _LOGGER, address, dev, self
+            )
+            _LOGGER.debug("Registering PDUC for %s", dev.name)
+            self.config_entry.async_on_unload(pduc.async_start())
         else:
             _LOGGER.warning("Very odd, we got sensor_created for non-tracked device")
 
diff --git a/custom_components/bermuda/binary_sensor.py b/custom_components/bermuda/binary_sensor.py
index 2e1c106..c974a45 100644
--- a/custom_components/bermuda/binary_sensor.py
+++ b/custom_components/bermuda/binary_sensor.py
@@ -1,4 +1,7 @@
 """Binary sensor platform for Bermuda BLE Trilateration."""
+
+from __future__ import annotations
+
 from homeassistant.components.binary_sensor import BinarySensorEntity
 
 from .const import BINARY_SENSOR
diff --git a/custom_components/bermuda/config_flow.py b/custom_components/bermuda/config_flow.py
index e14a9ac..7437f5c 100644
--- a/custom_components/bermuda/config_flow.py
+++ b/custom_components/bermuda/config_flow.py
@@ -1,4 +1,7 @@
 """Adds config flow for Bermuda BLE Trilateration."""
+
+from __future__ import annotations
+
 import voluptuous as vol
 from homeassistant import config_entries
 from homeassistant.components import bluetooth
diff --git a/custom_components/bermuda/const.py b/custom_components/bermuda/const.py
index 5174667..f6fdefd 100644
--- a/custom_components/bermuda/const.py
+++ b/custom_components/bermuda/const.py
@@ -1,5 +1,8 @@
 """Constants for Bermuda BLE Trilateration."""
+
 # Base component constants
+from __future__ import annotations
+
 NAME = "Bermuda BLE Trilateration"
 DOMAIN = "bermuda"
 DOMAIN_DATA = f"{DOMAIN}_data"
@@ -56,9 +59,9 @@
 DOCS[CONF_MAX_RADIUS] = "For simple area-detection, max radius from receiver"
 
 CONF_DEVTRACK_TIMEOUT, DEFAULT_DEVTRACK_TIMEOUT = "devtracker_nothome_timeout", 30
-DOCS[
-    CONF_DEVTRACK_TIMEOUT
-] = "Timeout in seconds for setting devices as `Not Home` / `Away`."
+DOCS[CONF_DEVTRACK_TIMEOUT] = (
+    "Timeout in seconds for setting devices as `Not Home` / `Away`."  # fmt: skip
+)
 
 CONF_ATTENUATION, DEFAULT_ATTENUATION = "attenuation", 3
 DOCS[CONF_ATTENUATION] = "Factor for environmental signal attenuation."
diff --git a/custom_components/bermuda/device_tracker.py b/custom_components/bermuda/device_tracker.py
index e5377f5..7b62a42 100644
--- a/custom_components/bermuda/device_tracker.py
+++ b/custom_components/bermuda/device_tracker.py
@@ -1,4 +1,5 @@
 """Create device_tracker entities for Bermuda devices"""
+
 from __future__ import annotations
 
 import logging
diff --git a/custom_components/bermuda/entity.py b/custom_components/bermuda/entity.py
index 6440e9d..ab6a0f8 100644
--- a/custom_components/bermuda/entity.py
+++ b/custom_components/bermuda/entity.py
@@ -1,4 +1,5 @@
 """BermudaEntity class"""
+
 from __future__ import annotations
 
 from typing import TYPE_CHECKING
diff --git a/custom_components/bermuda/sensor.py b/custom_components/bermuda/sensor.py
index f99ff8b..842c38a 100644
--- a/custom_components/bermuda/sensor.py
+++ b/custom_components/bermuda/sensor.py
@@ -1,4 +1,7 @@
 """Sensor platform for Bermuda BLE Trilateration."""
+
+from __future__ import annotations
+
 from collections.abc import Mapping
 from typing import Any
 
@@ -6,8 +9,8 @@
 from homeassistant.components.sensor import SensorDeviceClass
 from homeassistant.components.sensor import SensorStateClass
 from homeassistant.const import UnitOfLength
-from homeassistant.core import callback
 from homeassistant.core import HomeAssistant
+from homeassistant.core import callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
diff --git a/custom_components/bermuda/switch.py b/custom_components/bermuda/switch.py
index 04dbefe..ca18bae 100644
--- a/custom_components/bermuda/switch.py
+++ b/custom_components/bermuda/switch.py
@@ -1,4 +1,7 @@
 """Switch platform for Bermuda BLE Trilateration."""
+
+from __future__ import annotations
+
 from homeassistant.components.switch import SwitchEntity
 
 from .const import DEFAULT_NAME
diff --git a/requirements_test.txt b/requirements_test.txt
index 2a3cdac..04e4d68 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -3,6 +3,7 @@ pytest-asyncio
 pytest-homeassistant-custom-component
 #==0.13.50
 pre-commit
-reorder-python-imports
+isort
+black==24.2.0
 pyserial-asyncio==0.6
 pyserial==3.5
diff --git a/tests/__init__.py b/tests/__init__.py
index d2559b4..fa3be76 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1 +1,3 @@
 """Tests for Bermuda BLE Trilateration integration."""
+
+from __future__ import annotations
diff --git a/tests/conftest.py b/tests/conftest.py
index 015968e..3b921a2 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,4 +1,7 @@
 """Global fixtures for Bermuda BLE Trilateration integration."""
+
+from __future__ import annotations
+
 from unittest.mock import patch
 
 import pytest
diff --git a/tests/const.py b/tests/const.py
index c99b331..2a71fd9 100644
--- a/tests/const.py
+++ b/tests/const.py
@@ -1,4 +1,5 @@
 """Constants for Bermuda BLE Trilateration tests."""
+
 # AJG: We don't use these vars in our flow. TODO: Add some we _do_ use!
 # from custom_components.bermuda.const import (
 #    CONF_PASSWORD,
@@ -7,4 +8,6 @@
 #    CONF_USERNAME,
 # )
 # MOCK_CONFIG = {CONF_USERNAME: "test_username", CONF_PASSWORD: "test_password"}
+from __future__ import annotations
+
 MOCK_CONFIG = {}
diff --git a/tests/test_config_flow.py b/tests/test_config_flow.py
index f7ca6ee..1849d58 100644
--- a/tests/test_config_flow.py
+++ b/tests/test_config_flow.py
@@ -1,26 +1,20 @@
 """Test Bermuda BLE Trilateration config flow."""
+
+from __future__ import annotations
+
 from unittest.mock import patch
 
 import pytest
-from custom_components.bermuda.const import (
-    BINARY_SENSOR,
-)
-from custom_components.bermuda.const import (
-    DOMAIN,
-)
-from custom_components.bermuda.const import (
-    PLATFORMS,
-)
-from custom_components.bermuda.const import (
-    SENSOR,
-)
-from custom_components.bermuda.const import (
-    SWITCH,
-)
 from homeassistant import config_entries
 from homeassistant import data_entry_flow
 from pytest_homeassistant_custom_component.common import MockConfigEntry
 
+from custom_components.bermuda.const import BINARY_SENSOR
+from custom_components.bermuda.const import DOMAIN
+from custom_components.bermuda.const import PLATFORMS
+from custom_components.bermuda.const import SENSOR
+from custom_components.bermuda.const import SWITCH
+
 from .const import MOCK_CONFIG
 
 
diff --git a/tests/test_init.py b/tests/test_init.py
index 6bceace..85dc8d5 100644
--- a/tests/test_init.py
+++ b/tests/test_init.py
@@ -1,23 +1,17 @@
 """Test Bermuda BLE Trilateration setup process."""
+
+from __future__ import annotations
+
 import pytest
-from custom_components.bermuda import (
-    async_reload_entry,
-)
-from custom_components.bermuda import (
-    async_setup_entry,
-)
-from custom_components.bermuda import (
-    async_unload_entry,
-)
-from custom_components.bermuda import (
-    BermudaDataUpdateCoordinator,
-)
-from custom_components.bermuda.const import (
-    DOMAIN,
-)
 from homeassistant.exceptions import ConfigEntryNotReady
 from pytest_homeassistant_custom_component.common import MockConfigEntry
 
+from custom_components.bermuda import BermudaDataUpdateCoordinator
+from custom_components.bermuda import async_reload_entry
+from custom_components.bermuda import async_setup_entry
+from custom_components.bermuda import async_unload_entry
+from custom_components.bermuda.const import DOMAIN
+
 from .const import MOCK_CONFIG
 
 # from pytest_homeassistant_custom_component.common import AsyncMock
diff --git a/tests/test_switch.py b/tests/test_switch.py
index 6da17de..0ebcb36 100644
--- a/tests/test_switch.py
+++ b/tests/test_switch.py
@@ -1,24 +1,20 @@
 """Test Bermuda BLE Trilateration switch."""
+
+from __future__ import annotations
+
 from unittest.mock import call
 from unittest.mock import patch
 
-from custom_components.bermuda import (
-    async_setup_entry,
-)
-from custom_components.bermuda.const import (
-    DEFAULT_NAME,
-)
-from custom_components.bermuda.const import (
-    DOMAIN,
-)
-from custom_components.bermuda.const import (
-    SWITCH,
-)
 from homeassistant.components.switch import SERVICE_TURN_OFF
 from homeassistant.components.switch import SERVICE_TURN_ON
 from homeassistant.const import ATTR_ENTITY_ID
 from pytest_homeassistant_custom_component.common import MockConfigEntry
 
+from custom_components.bermuda import async_setup_entry
+from custom_components.bermuda.const import DEFAULT_NAME
+from custom_components.bermuda.const import DOMAIN
+from custom_components.bermuda.const import SWITCH
+
 from .const import MOCK_CONFIG