diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 59e9f82..54f5a0d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -18,5 +18,7 @@ jobs:
         run: make .venv
       - name: Run lint
         run: make lint
+      - name: Run typecheck
+        run: make typecheck
       - name: Run tests
         run: make test
diff --git a/pyproject.toml b/pyproject.toml
index bdf0cee..24c5959 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,16 +21,16 @@ dependencies = [
     "bluetooth-adapters ~= 0.16",
     "cachetools ~= 5.3",
     "dbus-fast ~= 2.15",
-    "pybricks ~= 3.5.0",
+    "pybricks ~= 3.6.0",
 ]
 
 [dependency-groups]
 debug = ["bluetooth-data-tools ~= 1.15"]
 dev = [
     "async-timer ~= 1.1.6",
-    "mypy ~= 1.15.0",
+    "mypy ~= 1.16.0",
     "pytest ~= 8.3",
-    "pytest-asyncio ~= 0.26.0",
+    "pytest-asyncio ~= 1.0.0",
     "python-dbusmock ~= 0.34.3",
     "ruff ~= 0.11.8",
     "types-cachetools ~= 5.3",
diff --git a/src/pb_ble/bluezdbus/broadcaster.py b/src/pb_ble/bluezdbus/broadcaster.py
index 2457364..3a29a71 100644
--- a/src/pb_ble/bluezdbus/broadcaster.py
+++ b/src/pb_ble/bluezdbus/broadcaster.py
@@ -83,7 +83,8 @@ async def stop_broadcast(self, adv: str | BroadcastAdvertisement):
             pass
         finally:
             self.bus.unexport(path)
-            del self.advertisements[path]
+            if path in self.advertisements:
+                del self.advertisements[path]
 
     async def stop(self):
         """
@@ -114,7 +115,8 @@ async def broadcast(self, adv: BroadcastAdvertisement):
         def release_advertisement(path):
             try:
                 self.bus.unexport(path)
-                del self.advertisements[path]
+                if path in self.advertisements:
+                    del self.advertisements[path]
             finally:
                 on_release(path)
 
diff --git a/src/pb_ble/constants.py b/src/pb_ble/constants.py
index f315d47..81d5bdd 100644
--- a/src/pb_ble/constants.py
+++ b/src/pb_ble/constants.py
@@ -18,7 +18,7 @@
 """Type of a value that can be broadcast."""
 
 PybricksBroadcastData: TypeAlias = (
-    PybricksBroadcastValue | tuple[PybricksBroadcastValue]
+    PybricksBroadcastValue | tuple[PybricksBroadcastValue, ...]
 )
 """Type of the broadcast data."""
 
diff --git a/src/pb_ble/messages.py b/src/pb_ble/messages.py
index 7b02544..c9d9cc8 100644
--- a/src/pb_ble/messages.py
+++ b/src/pb_ble/messages.py
@@ -10,11 +10,14 @@
 
 """
 
+import logging
 from enum import IntEnum
 from struct import pack, unpack, unpack_from
-from typing import Literal, Tuple
+from typing import Literal, Tuple, cast
 
-from .constants import PybricksBroadcast, PybricksBroadcastValue
+from .constants import PybricksBroadcast, PybricksBroadcastData, PybricksBroadcastValue
+
+logger = logging.getLogger(__name__)
 
 
 def decode_message(
@@ -30,24 +33,32 @@ def decode_message(
         or a tuple.
     """
 
+    logger.debug(f"decoding[{len(data)}]: {data!r}")
+
     # idx 0 is the channel
     channel: int = unpack_from("<B", data)[0]  # uint8
+    logger.debug(f"channel: {channel}")
     # idx 1 is the message start
     idx = 1
-    decoded_data = []
+    decoded_data: list[PybricksBroadcastValue] = []
     single_object = False
 
     while idx < len(data):
         idx, val = _decode_next_value(idx, data)
         if val is None:
+            logger.debug(f"data[{len(decoded_data)}]: SINGLE_OBJECT marker")
             single_object = True
         else:
+            logger.debug(f"data[{len(decoded_data)}] of {type(val)!s:<15}: {val!r}")
             decoded_data.append(val)
 
     if single_object:
-        return PybricksBroadcast(channel, decoded_data[0])
+        decoded_value: PybricksBroadcastValue = decoded_data[0]
+        return PybricksBroadcast(channel, decoded_value)
     else:
-        return PybricksBroadcast(channel, tuple(decoded_data))  # type: ignore # https://github.com/python/mypy/issues/7509
+        return PybricksBroadcast(
+            channel, cast(PybricksBroadcastData, tuple(decoded_data))
+        )
 
 
 def encode_message(channel: int = 0, *values: PybricksBroadcastValue) -> bytes:
@@ -63,6 +74,7 @@ def encode_message(channel: int = 0, *values: PybricksBroadcastValue) -> bytes:
 
     # idx 0 is the channel
     encoded_channel = pack("<B", channel)
+    logger.debug(f"channel: {channel} -> {encoded_channel!r}")
 
     # idx 1 is the message start
     encoded_data = bytearray(encoded_channel)
@@ -70,10 +82,14 @@ def encode_message(channel: int = 0, *values: PybricksBroadcastValue) -> bytes:
     if len(values) == 1:
         # set SINGLE_OBJECT marker
         header = PybricksBleBroadcastDataType.SINGLE_OBJECT << 5
+        logger.debug(f"data[{len(encoded_data)}]: SINGLE_OBJECT marker")
         encoded_data.append(header)
 
     for val in values:
         header, encoded_val = _encode_value(val)
+        logger.debug(
+            f"data[{len(encoded_data)}] of {type(val)!s}: {val!r} -> ({header!r}, {encoded_val!r})"
+        )
         encoded_data.append(header)
 
         if encoded_val is not None:
@@ -85,7 +101,9 @@ def encode_message(channel: int = 0, *values: PybricksBroadcastValue) -> bytes:
                 f"Payload too large: {len(encoded_data)} bytes (maximum is {OBSERVED_DATA_MAX_SIZE} bytes)"
             )
 
-    return bytes(encoded_data)
+    message = bytes(encoded_data)
+    logger.debug(f"encoded[{len(message)}]: {message!r}")
+    return message
 
 
 def unpack_pnp_id(data: bytes) -> Tuple[Literal["BT", "USB"], int, int, int]:
@@ -99,9 +117,14 @@ def unpack_pnp_id(data: bytes) -> Tuple[Literal["BT", "USB"], int, int, int]:
     :return: Tuple containing the vendor ID type (`BT` or `USB`), the vendor
         ID, the product ID and the product revision.
     """
+    vid_type: int
+    vid: int
+    pid: int
+    rev: int
+
     vid_type, vid, pid, rev = unpack("<BHHH", data)
-    vid_type = "BT" if vid_type else "USB"
-    return vid_type, vid, pid, rev
+
+    return "BT" if vid_type else "USB", vid, pid, rev
 
 
 def pack_pnp_id(
diff --git a/src/pb_ble/py.typed b/src/pb_ble/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/src/pb_ble/vhub.py b/src/pb_ble/vhub.py
index 1088902..a82ae90 100644
--- a/src/pb_ble/vhub.py
+++ b/src/pb_ble/vhub.py
@@ -1,6 +1,6 @@
 import sys
 from contextlib import AsyncExitStack
-from typing import ClassVar, Optional, Sequence, Tuple, Union
+from typing import ClassVar, Optional, Sequence, Tuple, Union, cast
 
 from dbus_fast.aio import MessageBus, ProxyObject
 from dbus_fast.constants import BusType
@@ -16,6 +16,8 @@
 from .constants import (
     PYBRICKS_MAX_CHANNEL,
     PYBRICKS_MIN_CHANNEL,
+    PybricksBroadcastData,
+    PybricksBroadcastValue,
     ScanningMode,
 )
 
@@ -61,19 +63,32 @@ async def __aenter__(self):
                 raise
         return self
 
-    async def broadcast(self, data: Union[bool, int, float, str, bytes]) -> None:
-        if data is None:
+    async def broadcast(self, *data: PybricksBroadcastValue | None) -> None:  # type: ignore [override]
+        if len(data) == 0:
+            raise ValueError("Broadcast must be a value or tuple.")
+        if None in data:
             await self._broadcaster.stop_broadcast(self._adv)
         else:
             if not self._broadcaster.is_broadcasting(self._adv):
                 await self._broadcaster.broadcast(self._adv)
-            self._adv.message = data
+            self._adv.message = cast(PybricksBroadcastData, tuple(data))
 
     def observe(
         self, channel: int
     ) -> Optional[Tuple[Union[bool, int, float, str, bytes], ...]]:
         advertisement = self._observer.observe(channel)
-        return advertisement.data if advertisement is not None else None
+
+        if advertisement is not None:
+            if isinstance(advertisement.data, tuple):
+                return advertisement.data
+            else:
+                # TODO: Pybricks does expose single-value broadcasts
+                # in a single-object tuple. However, that doesn't match
+                # the type signature of the observe() method. To adhere
+                # to the type signature, we only return wrapped values.
+                return (advertisement.data,)
+        else:
+            return None
 
     def signal_strength(self, channel: int) -> int:
         advertisement = self._observer.observe(channel)
diff --git a/tests/fixtures/bluez5_mock.py b/tests/fixtures/bluez5_mock.py
index 230d141..afc7cd2 100644
--- a/tests/fixtures/bluez5_mock.py
+++ b/tests/fixtures/bluez5_mock.py
@@ -1,8 +1,8 @@
 import sys
 import unittest.mock
 
-import dbus
 import pytest
+from dbus.proxies import ProxyObject
 from dbusmock import SpawnedMock
 from dbusmock.testcase import PrivateDBus
 
@@ -19,7 +19,7 @@ def pytest_runtest_setup(item) -> None:
 
 
 @pytest.fixture
-def bluez_mock(dbusmock_system: PrivateDBus) -> YieldFixture[dbus.proxies.ProxyObject]:
+def bluez_mock(dbusmock_system: PrivateDBus) -> YieldFixture[ProxyObject]:
     template = "bluez5"
     parameters = {
         "advertise": True,
@@ -34,9 +34,7 @@ def bluez_mock(dbusmock_system: PrivateDBus) -> YieldFixture[dbus.proxies.ProxyO
 
 
 @pytest.fixture(autouse=True)
-def adapter_mock(
-    bluez_mock: dbus.proxies.ProxyObject, adapter_name: str
-) -> YieldFixture[str]:
+def adapter_mock(bluez_mock: ProxyObject, adapter_name: str) -> YieldFixture[str]:
     device_name = adapter_name
 
     # Mock out the DBus adapter
diff --git a/tests/test_messages.py b/tests/test_messages.py
index 4940b1a..2e29f26 100644
--- a/tests/test_messages.py
+++ b/tests/test_messages.py
@@ -5,6 +5,7 @@
 
 
 class TestPybricksBleDecodeMessage:
+    # h.ble.broadcast(5)
     def test_decode_message_single_object(self):
         # channel 200
         # single object marker
@@ -13,11 +14,11 @@ def test_decode_message_single_object(self):
         channel, data = decode_message(message)
 
         assert channel == 200
-        assert not isinstance(data, tuple)
+        assert isinstance(data, int), type(data)
 
         assert data == 5
 
-    # TODO: Check behaviour against reference implementation
+    # h.ble.broadcast((5,))
     def test_decode_message_single_object_tuple(self):
         # channel 200
         # int8: 5
@@ -25,10 +26,23 @@ def test_decode_message_single_object_tuple(self):
         channel, data = decode_message(message)
 
         assert channel == 200
+        assert isinstance(data, tuple), type(data)
+        assert len(data) == 1
+
+        assert data == (5,)
+
+    # h.ble.broadcast((5,))
+    def test_decode_message_single_object_tuple_0(self):
+        # channel 0
+        # int8: 5
+        message = b"\x00a\x05"
+        channel, data = decode_message(message)
+
+        assert channel == 0
         assert isinstance(data, tuple)
         assert len(data) == 1
 
-        assert data[0] == 5
+        assert data == (5,)
 
     def test_decode_message_int8_int16_int32(self):
         # channel: 200
@@ -127,9 +141,9 @@ def test_encode_message_single_object(self):
         data = encode_message(200, 5)
         assert data == b"\xc8\x00\x61\x05"
 
-    @pytest.mark.skip("Check behaviour against reference implementation")
+    @pytest.mark.skip("Encoding single-object tuples is not supported")
     def test_encode_message_single_object_tuple(self):
-        data = encode_message(200, (1))
+        data = encode_message(200, (1,))  # type: ignore[arg-type]
         assert data == b"\xc8\x61\x01"
 
     def test_encode_message_int8_int16_int32(self):
diff --git a/tests/test_vhub.py b/tests/test_vhub.py
index 8b786df..cb29364 100644
--- a/tests/test_vhub.py
+++ b/tests/test_vhub.py
@@ -16,15 +16,37 @@ class TestVirtualBLE:
     async def test_create_vble(self, adapter):
         ble = await get_virtual_ble(broadcast_channel=1, observe_channels=[2])
         assert ble is not None
+        assert not ble._broadcaster.is_broadcasting()
 
-    async def test_observe(self):
+    async def test_observe_none(self):
         ble = await get_virtual_ble(broadcast_channel=1, observe_channels=[2])
         data = ble.observe(2)
         assert data is None
+        assert not ble._broadcaster.is_broadcasting()
 
-    async def test_broadcast(self):
+    async def test_broadcast_single(self):
         ble = await get_virtual_ble(broadcast_channel=1, observe_channels=[2])
         await ble.broadcast(42)
+        assert ble._broadcaster.is_broadcasting()
+        assert ble._adv.message == 42
+
+    async def test_broadcast_multiple(self):
+        ble = await get_virtual_ble(broadcast_channel=1, observe_channels=[2])
+        await ble.broadcast(42, 24)
+        assert ble._broadcaster.is_broadcasting()
+        assert ble._adv.message == (42, 24)
+
+    async def test_broadcast_none(self):
+        ble = await get_virtual_ble(broadcast_channel=1, observe_channels=[2])
+        await ble.broadcast(None)
+        assert not ble._broadcaster.is_broadcasting()
+
+    async def test_broadcast_start_stop(self):
+        ble = await get_virtual_ble(broadcast_channel=1, observe_channels=[2])
+        await ble.broadcast(42)
+        assert ble._broadcaster.is_broadcasting()
+        await ble.broadcast(None)
+        assert not ble._broadcaster.is_broadcasting()
 
     async def test_context(self):
         async with await get_virtual_ble(