diff --git a/pylamarzocco/clients/bluetooth.py b/pylamarzocco/clients/bluetooth.py
index 1a018d4..40557c5 100644
--- a/pylamarzocco/clients/bluetooth.py
+++ b/pylamarzocco/clients/bluetooth.py
@@ -131,11 +131,19 @@ async def authenticate() -> None:
                     base64.b64encode(user_bytes) + b"@" + base64.b64encode(token)
                 )
 
+                auth_characteristic = client.services.get_characteristic(
+                    AUTH_CHARACTERISTIC
+                )
+                if auth_characteristic is None:
+                    raise BluetoothConnectionFailed(
+                        f"Could not find auth characteristic {AUTH_CHARACTERISTIC} on machine."
+                    )
+
                 try:
                     await client.write_gatt_char(
-                        char_specifier=AUTH_CHARACTERISTIC,
+                        char_specifier=auth_characteristic,
                         data=auth_string,
-                        response=False,
+                        response=True,
                     )
                 except (BleakError, TimeoutError) as e:
                     raise BluetoothConnectionFailed(
@@ -148,10 +156,18 @@ async def authenticate() -> None:
                 "Sending bluetooth message: %s to %s", message, characteristic
             )
 
+            settings_characteristic = client.services.get_characteristic(
+                SETTINGS_CHARACTERISTIC
+            )
+            if settings_characteristic is None:
+                raise BluetoothConnectionFailed(
+                    f"Could not find settings characteristic {SETTINGS_CHARACTERISTIC} on machine."
+                )
+
             await client.write_gatt_char(
-                char_specifier=characteristic,
+                char_specifier=settings_characteristic,
                 data=message,
-                response=False,
+                response=True,
             )
 
     async def _write_bluetooth_json_message(
diff --git a/pyproject.toml b/pyproject.toml
index 46b7ad4..5a17142 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "pylamarzocco"
-version = "1.4.5"
+version = "1.4.6"
 license = { text = "MIT" }
 description = "A Python implementation of the new La Marzocco API"
 readme = "README.md"
diff --git a/tests/conftest.py b/tests/conftest.py
index 03ec488..1cd9afa 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -161,4 +161,6 @@ def mock_bleak() -> Generator[AsyncMock, None, None]:
     """Mock BleakClient."""
     with patch("pylamarzocco.clients.bluetooth.BleakClient") as bleak_client:
         aenter = bleak_client.return_value.__aenter__.return_value
+        aenter.services.get_characteristic = lambda uuid: uuid
+
         yield aenter
diff --git a/tests/test_bluetooth.py b/tests/test_bluetooth.py
index 1a53fe0..605d0f1 100644
--- a/tests/test_bluetooth.py
+++ b/tests/test_bluetooth.py
@@ -21,13 +21,13 @@ async def test_bluetooth_set_power(
     mock_bleak.write_gatt_char.assert_any_call(  # type: ignore[attr-defined]
         char_specifier=AUTH_CHARACTERISTIC,
         data=b"dXNlcm5hbWU6c2VyaWFs@dG9rZW4=",
-        response=False,
+        response=True,
     )
 
     mock_bleak.write_gatt_char.assert_called_with(  # type: ignore[attr-defined]
         char_specifier=SETTINGS_CHARACTERISTIC,
         data=b'{"name":"MachineChangeMode","parameter":{"mode":"BrewingMode"}}\x00',
-        response=False,
+        response=True,
     )
 
 
@@ -41,13 +41,13 @@ async def test_bluetooth_set_steam(
     mock_bleak.write_gatt_char.assert_any_call(  # type: ignore[attr-defined]
         char_specifier=AUTH_CHARACTERISTIC,
         data=b"dXNlcm5hbWU6c2VyaWFs@dG9rZW4=",
-        response=False,
+        response=True,
     )
 
     mock_bleak.write_gatt_char.assert_called_with(  # type: ignore[attr-defined]
         char_specifier=SETTINGS_CHARACTERISTIC,
         data=b'{"name":"SettingBoilerEnable","parameter":{"identifier":"SteamBoiler","state":true}}\x00',
-        response=False,
+        response=True,
     )
 
 
@@ -61,11 +61,11 @@ async def test_bluetooth_set_temperature(
     mock_bleak.write_gatt_char.assert_any_call(  # type: ignore[attr-defined]
         char_specifier=AUTH_CHARACTERISTIC,
         data=b"dXNlcm5hbWU6c2VyaWFs@dG9rZW4=",
-        response=False,
+        response=True,
     )
 
     mock_bleak.write_gatt_char.assert_called_with(  # type: ignore[attr-defined]
         char_specifier=SETTINGS_CHARACTERISTIC,
         data=b'{"name":"SettingBoilerTarget","parameter":{"identifier":"SteamBoiler","value":131}}\x00',
-        response=False,
+        response=True,
     )