Optimized pydantic use

All protocol classes have now been duplicated in order to minimize the
use of pydantic validation

The "pure" classes are named what the previous validated classes were,
now each transport has its transport name prefixed on the class.

For example before we had Heartbeat, now we have Heartbeat and
JsonHeartbeat

This new architecture allows us to reduce the number of useless backend
validation steps created when copying and processing data, reducing CPU
stress by roughly 10-20% in real world testing

src/dynalab_core/constants.py

@@ -5,23 +5,19 @@
 from uuid import uuid4
 from dynalab_core.protocols.common import VersionDescriptor
 from dynalab_core.protocols.constants import PROTOCOL_VERSION
-from dynalab_core.protocols.packets.handshake import ConnectorHello, DynaLabHello
+from dynalab_core.protocols.packets.handshake import (
+    ConnectorHello,
+    DynaLabHello,
+    JsonDynaLabHello,
+)
 
 
 CORE_VERSION = VersionDescriptor(type="alpha", major=0, minor=0, patch=1)
 
-HELLO_PACKET = DynaLabHello(
+HELLO_PACKET = JsonDynaLabHello(
     instance_id=uuid4(),
     core_version=CORE_VERSION,
     protocol_version=PROTOCOL_VERSION,
     heartbeat_interval_ms=1000,
     heartbeat_timeout_ms=5000,
 )
-
-INTERNAL_CONNECTOR_HELLO = ConnectorHello(
-    connector_uuid=uuid4(),
-    protocol_version=PROTOCOL_VERSION,
-    connector_name="INTERNAL_LOOPBACK",
-    connector_version=CORE_VERSION.get_version(),
-    signals=[],
-)

src/dynalab_core/protocols/endpoint.py

@@ -10,7 +10,7 @@ from time import monotonic, sleep
 from uuid import UUID
 
 from dynalab_core.types import CoreModeState
-from dynalab_core.constants import HELLO_PACKET, INTERNAL_CONNECTOR_HELLO
+from dynalab_core.constants import HELLO_PACKET
 from dynalab_core.errors import ConnectorError
 from dynalab_core.protocols.packets import ProtocolMessage
 from dynalab_core.protocols.packets.data import ValueBatch, ValueDescriptor
@@ -486,21 +486,10 @@ class ConnectorEndpoint:
 class ConnectorRegistry:
     def __init__(self, core_input_queue: Queue, core_mode: CoreModeState) -> None:
         self._endpoints: dict[UUID, ConnectorEndpoint] = {}
-        self._internal_connector: ConnectorHello = INTERNAL_CONNECTOR_HELLO
         self._lock = RLock()
         self._core_input_queue = core_input_queue
         self._core_mode = core_mode
 
-    def add_internal_signal(self, signal: SignalDescriptor) -> None:
-        with self._lock:
-            if not any(s.id == signal.id for s in self._internal_connector.signals):
-                self._internal_connector.signals.append(signal)
-
-    def remove_internal_signal(self, signal: SignalDescriptor) -> None:
-        with self._lock:
-            if not any(s.id == signal.id for s in self._internal_connector.signals):
-                self._internal_connector.signals.remove(signal)
-
     def register(
         self,
         hello: ConnectorHello,
@@ -612,14 +601,7 @@ class ConnectorRegistry:
 
     def get(self, connector_uuid: UUID) -> ConnectorEndpoint | None:
         with self._lock:
-            endpoint = self._endpoints.get(connector_uuid)
-            if not endpoint:
-                return endpoint
-
-            if self._internal_connector.connector_uuid == connector_uuid:
-                return self._internal_connector
-
-            return None
+            return self._endpoints.get(connector_uuid)
 
     def get_signal_descriptor(self, signal_id: UUID) -> SignalDescriptor | None:
         with self._lock:
@@ -630,10 +612,6 @@ class ConnectorRegistry:
                 if signal is not None:
                     return signal
 
-            for signal in self._internal_connector.signals:
-                if signal.id == signal_id:
-                    return signal
-
             return None
 
     def get_all_signal_descriptors(self) -> list[SignalDescriptor]:
@@ -646,9 +624,6 @@ class ConnectorRegistry:
             for signal in endpoint_signals:
                 signals.append(signal)
 
-        for signal in self._internal_connector.signals:
-            signals.append(signal)
-
         return signals
 
     def stop(self) -> bool:

src/dynalab_core/protocols/json/server.py

@@ -17,7 +17,12 @@ from dynalab_core.constants import HELLO_PACKET
 from dynalab_core.protocols.endpoint import ConnectorEndpoint, ConnectorRegistry
 from dynalab_core.errors import ConnectorError, JsonServerError
 from dynalab_core.protocols.json.wire import read_message, write_message
-from dynalab_core.protocols.packets.handshake import ConnectorHello, HandshakeAccepted
+from dynalab_core.protocols.packets.data import JsonValueBatch, JsonValueDescriptor
+from dynalab_core.protocols.packets.handshake import (
+    ConnectorHello,
+    HandshakeAccepted,
+    JsonConnectorHello,
+)
 
 log = logging.getLogger(__name__)
 
@@ -193,6 +198,7 @@ class JsonServer:
         )
         while not self._stop_event.is_set():
             message = await read_message(reader)
+            message = message.to_pure()
             endpoint.put_ingress_packet(message)
 
     async def _output_task(
@@ -216,7 +222,8 @@ class JsonServer:
             except Empty:
                 await asyncio.sleep(0.01)
                 continue
-            await write_message(writer, message)
+            json_message = message.to_json()
+            await write_message(writer, json_message)
             if isinstance(message, HandshakeAccepted):
                 log.info(
                     "Connector %s connected from %s",
@@ -309,7 +316,7 @@ class JsonServer:
                 )
                 return
 
-            if not isinstance(message, ConnectorHello):
+            if not isinstance(message, JsonConnectorHello):
                 reason = "unexpected_message"
                 log.warning(
                     "Connection %s sent %s instead of connector_hello",
@@ -324,7 +331,7 @@ class JsonServer:
                 )
                 return
 
-            connector_hello = message
+            connector_hello = message.to_pure()
             context["connector_uuid"] = str(connector_hello.connector_uuid)
             timeout_event = threading.Event()
             reject_event = threading.Event()

src/dynalab_core/protocols/json/wire.py

@@ -5,19 +5,19 @@
 from asyncio import StreamReader, StreamWriter
 from pydantic import TypeAdapter
 
-from dynalab_core.protocols.packets import ProtocolMessage
+from dynalab_core.protocols.packets import JsonProtocolMessage
 
-_MESSAGE_ADAPTER = TypeAdapter(ProtocolMessage)
+_MESSAGE_ADAPTER = TypeAdapter(JsonProtocolMessage)
 
 
-async def write_message(writer: StreamWriter, message: ProtocolMessage) -> None:
+async def write_message(writer: StreamWriter, message: JsonProtocolMessage) -> None:
     writer.write(message.model_dump_json().encode("utf-8") + b"\n")
     await writer.drain()
 
 
 async def read_message(
     reader: StreamReader, *, max_frame_bytes: int = 65_536
-) -> ProtocolMessage:
+) -> JsonProtocolMessage:
     line = await reader.readline()
 
     if not line:

src/dynalab_core/protocols/packets/__init__.py

@@ -2,27 +2,40 @@
 # Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-from typing import Annotated
-
-from pydantic import Field
-
-from dynalab_core.protocols.packets.data import ValueBatch, ValueDescriptor
+from dynalab_core.protocols.packets.data import (
+    JsonValueBatch,
+    JsonValueDescriptor,
+    ValueBatch,
+    ValueDescriptor,
+)
 from dynalab_core.protocols.packets.handshake import (
     ConnectorHello,
     DynaLabHello,
     HandshakeAccepted,
     HandshakeRejected,
+    JsonConnectorHello,
+    JsonDynaLabHello,
+    JsonHandshakeAccepted,
+    JsonHandshakeRejected,
 )
-from dynalab_core.protocols.packets.heartbeat import Heartbeat
+from dynalab_core.protocols.packets.heartbeat import Heartbeat, JsonHeartbeat
+from dynalab_core.protocols.packets.types import JsonProtocolMessage, ProtocolMessage
 
-
-ProtocolMessage = Annotated[
-    DynaLabHello
-    | ConnectorHello
-    | HandshakeAccepted
-    | HandshakeRejected
-    | Heartbeat
-    | ValueDescriptor
-    | ValueBatch,
-    Field(discriminator="type"),
+__all__ = [
+    "ConnectorHello",
+    "DynaLabHello",
+    "HandshakeAccepted",
+    "HandshakeRejected",
+    "Heartbeat",
+    "JsonConnectorHello",
+    "JsonDynaLabHello",
+    "JsonHandshakeAccepted",
+    "JsonHandshakeRejected",
+    "JsonHeartbeat",
+    "JsonProtocolMessage",
+    "JsonValueBatch",
+    "JsonValueDescriptor",
+    "ProtocolMessage",
+    "ValueBatch",
+    "ValueDescriptor",
 ]

src/dynalab_core/protocols/packets/data.py

@@ -2,18 +2,55 @@
 # Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from __future__ import annotations
+from dataclasses import dataclass
 from typing import Literal
 from uuid import UUID
-from pydantic import BaseModel
+from pydantic import BaseModel, ConfigDict
+
+@dataclass(slots=True)
+class ValueDescriptor:
+    signal_id: UUID
+    value: float
+    timestamp: int
+
+    def __init__(self, signal_id: UUID, value: float, timestamp: int) -> None:
+        self.signal_id: UUID = signal_id
+        self.value: float = value
+        self.timestamp: int = timestamp
+
+    def to_json(self) -> JsonValueDescriptor:
+        return JsonValueDescriptor.model_validate(self)
 
 
-class ValueDescriptor(BaseModel):
+@dataclass(slots=True)
+class ValueBatch:
+    values: list[ValueDescriptor]
+
+    def __init__(self, values: list[ValueDescriptor]) -> None:
+        self.values: list[ValueDescriptor] = values
+
+    def to_json(self) -> JsonValueBatch:
+        return JsonValueBatch.model_validate(self)
+
+
+class JsonValueDescriptor(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
     type: Literal["value_descriptor"] = "value_descriptor"
     signal_id: UUID
     value: float
     timestamp: int
 
+    def to_pure(self) -> ValueDescriptor:
+        return ValueDescriptor(self.signal_id, self.value, self.timestamp)
+
+
+class JsonValueBatch(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
 
-class ValueBatch(BaseModel):
     type: Literal["value_batch"] = "value_batch"
-    values: list[ValueDescriptor]
+    values: list[JsonValueDescriptor]
+
+    def to_pure(self) -> ValueBatch:
+        return ValueBatch([value.to_pure() for value in self.values])

src/dynalab_core/protocols/packets/handshake.py

@@ -2,15 +2,129 @@
 # Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from __future__ import annotations
+from dataclasses import dataclass
 from typing import Literal
 from uuid import UUID
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, ConfigDict, Field
 
 from dynalab_core.protocols.common import VersionDescriptor
 from dynalab_core.protocols.constants import PROTOCOL_VERSION
+@dataclass(slots=True)
+class SignalDescriptor:
+    id: UUID
+    name: str
+    type: Literal["number", "binary"]
+    min_value: float | None
+    max_value: float | None
+    unit: str | None
+    timeout_ms: int
+    origin: Literal["source", "derived"]
+
+    def __init__(
+        self,
+        id: UUID,
+        name: str,
+        type: Literal["number", "binary"],
+        min_value: float | None = None,
+        max_value: float | None = None,
+        unit: str | None = None,
+        timeout_ms: int = 2000,
+        origin: Literal["source", "derived"] = "source",
+    ) -> None:
+        self.id: UUID = id
+        self.name: str = name
+        self.type: Literal["number", "binary"] = type
+        self.min_value: float | None = min_value
+        self.max_value: float | None = max_value
+        self.unit: str | None = unit
+        self.timeout_ms: int = timeout_ms
+        self.origin: Literal["source", "derived"] = origin
+
+    def to_json(self) -> JsonSignalDescriptor:
+        return JsonSignalDescriptor.model_validate(self)
 
 
-class SignalDescriptor(BaseModel):
+@dataclass(slots=True)
+class DynaLabHello:
+    instance_id: UUID
+    core_version: VersionDescriptor
+    protocol_version: VersionDescriptor
+    heartbeat_interval_ms: int
+    heartbeat_timeout_ms: int
+
+    def __init__(
+        self,
+        instance_id: UUID,
+        core_version: VersionDescriptor,
+        protocol_version: VersionDescriptor = PROTOCOL_VERSION,
+        heartbeat_interval_ms: int = 1000,
+        heartbeat_timeout_ms: int = 5000,
+    ) -> None:
+        self.instance_id: UUID = instance_id
+        self.core_version: VersionDescriptor = core_version
+        self.protocol_version: VersionDescriptor = protocol_version
+
+        self.heartbeat_interval_ms: int = heartbeat_interval_ms
+        self.heartbeat_timeout_ms: int = heartbeat_timeout_ms
+
+    def to_json(self) -> JsonDynaLabHello:
+        return JsonDynaLabHello.model_validate(self)
+
+
+@dataclass(slots=True)
+class ConnectorHello:
+    connector_uuid: UUID
+    protocol_version: VersionDescriptor
+    connector_name: str
+    connector_version: str
+    signals: list[SignalDescriptor]
+
+    def __init__(
+        self,
+        connector_uuid: UUID,
+        connector_name: str,
+        connector_version: str,
+        signals: list[SignalDescriptor],
+        protocol_version: VersionDescriptor = PROTOCOL_VERSION,
+    ) -> None:
+        self.connector_uuid: UUID = connector_uuid
+        self.protocol_version: VersionDescriptor = protocol_version
+
+        self.connector_name: str = connector_name
+        self.connector_version: str = connector_version
+
+        self.signals: list[SignalDescriptor] = signals
+
+    def to_json(self) -> JsonConnectorHello:
+        return JsonConnectorHello.model_validate(self)
+
+
+@dataclass(slots=True)
+class HandshakeAccepted:
+    accepted_signals: list[UUID]
+
+    def __init__(self, accepted_signals: list[UUID]) -> None:
+        self.accepted_signals: list[UUID] = accepted_signals
+
+    def to_json(self) -> JsonHandshakeAccepted:
+        return JsonHandshakeAccepted.model_validate(self)
+
+
+@dataclass(slots=True)
+class HandshakeRejected:
+    reason: str
+
+    def __init__(self, reason: str) -> None:
+        self.reason: str = reason
+
+    def to_json(self) -> JsonHandshakeRejected:
+        return JsonHandshakeRejected.model_validate(self)
+
+
+class JsonSignalDescriptor(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
     id: UUID
     name: str
     type: Literal["number", "binary"]
@@ -20,18 +134,41 @@ class SignalDescriptor(BaseModel):
     timeout_ms: int = 2000
     origin: Literal["source", "derived"] = "source"
 
+    def to_pure(self) -> SignalDescriptor:
+        return SignalDescriptor(
+            self.id,
+            self.name,
+            self.type,
+            self.min_value,
+            self.max_value,
+            self.unit,
+            self.timeout_ms,
+            self.origin,
+        )
 
-class DynaLabHello(BaseModel):
+
+class JsonDynaLabHello(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
     type: Literal["dynalab_hello"] = "dynalab_hello"
     instance_id: UUID
     core_version: VersionDescriptor
     protocol_version: VersionDescriptor = PROTOCOL_VERSION
 
-    heartbeat_interval_ms: int = Field(default_factory=1000, ge=0)
-    heartbeat_timeout_ms: int = Field(default_factory=5000, ge=0)
+    heartbeat_interval_ms: int = Field(default=1000, ge=0)
+    heartbeat_timeout_ms: int = Field(default=5000, ge=0)
+
+    def to_pure(self) -> DynaLabHello:
+        return DynaLabHello(
+            self.instance_id,
+            self.core_version,
+            self.protocol_version,
+            self.heartbeat_interval_ms,
+            self.heartbeat_timeout_ms,
+        )
 
 
-class ConnectorHello(BaseModel):
+class JsonConnectorHello(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
     type: Literal["connector_hello"] = "connector_hello"
     connector_uuid: UUID
     protocol_version: VersionDescriptor = PROTOCOL_VERSION
@@ -39,14 +176,31 @@ class ConnectorHello(BaseModel):
     connector_name: str
     connector_version: str
 
-    signals: list[SignalDescriptor]
+    signals: list[JsonSignalDescriptor]
+
+    def to_pure(self) -> ConnectorHello:
+        return ConnectorHello(
+            connector_uuid=self.connector_uuid,
+            connector_name=self.connector_name,
+            connector_version=self.connector_version,
+            signals=[signal.to_pure() for signal in self.signals],
+            protocol_version=self.protocol_version,
+        )
 
 
-class HandshakeAccepted(BaseModel):
+class JsonHandshakeAccepted(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
     type: Literal["handshake_accepted"] = "handshake_accepted"
     accepted_signals: list[UUID]
 
+    def to_pure(self) -> HandshakeAccepted:
+        return HandshakeAccepted(self.accepted_signals)
 
-class HandshakeRejected(BaseModel):
+
+class JsonHandshakeRejected(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
     type: Literal["handshake_rejected"] = "handshake_rejected"
     reason: str
+
+    def to_pure(self) -> HandshakeRejected:
+        return HandshakeRejected(self.reason)

src/dynalab_core/protocols/packets/heartbeat.py

@@ -2,13 +2,35 @@
 # Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-
+from __future__ import annotations
+from dataclasses import dataclass
 from typing import Literal
-from pydantic import BaseModel
+from pydantic import BaseModel, ConfigDict
+
+@dataclass(slots=True)
+class Heartbeat:
+    sequence: int
+    send_timestamp: int
+    return_timestamp: int | None
+
+    def __init__(
+        self, sequence: int, send_timestamp: int, return_timestamp: int | None = None
+    ) -> None:
+        self.sequence: int = sequence
+        self.send_timestamp: int = send_timestamp
+        self.return_timestamp: int | None = return_timestamp
+
+    def to_json(self) -> JsonHeartbeat:
+        return JsonHeartbeat.model_validate(self)
 
 
-class Heartbeat(BaseModel):
+class JsonHeartbeat(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
     type: Literal["heartbeat"] = "heartbeat"
     sequence: int
     send_timestamp: int
     return_timestamp: int | None = None
+
+    def to_pure(self) -> Heartbeat:
+        return Heartbeat(self.sequence, self.send_timestamp, self.return_timestamp)

src/dynalab_core/protocols/packets/types.py

@@ -0,0 +1,55 @@
+# Copyright (C) 2026 Hector van der Aa <hector@h3cx.dev>
+# Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+"""Aggregate packet types used at package boundaries.
+
+Leaf packet modules deliberately do not import this module.  Keeping the
+aggregate unions here prevents the package re-export layer from becoming part
+of a packet model's dependency graph.
+"""
+
+from typing import Annotated
+
+from pydantic import Field
+
+from dynalab_core.protocols.packets.data import (
+    JsonValueBatch,
+    JsonValueDescriptor,
+    ValueBatch,
+    ValueDescriptor,
+)
+from dynalab_core.protocols.packets.handshake import (
+    ConnectorHello,
+    DynaLabHello,
+    HandshakeAccepted,
+    HandshakeRejected,
+    JsonConnectorHello,
+    JsonDynaLabHello,
+    JsonHandshakeAccepted,
+    JsonHandshakeRejected,
+)
+from dynalab_core.protocols.packets.heartbeat import Heartbeat, JsonHeartbeat
+
+
+ProtocolMessage = Annotated[
+    DynaLabHello
+    | ConnectorHello
+    | HandshakeAccepted
+    | HandshakeRejected
+    | Heartbeat
+    | ValueDescriptor
+    | ValueBatch,
+    Field(discriminator="type"),
+]
+
+JsonProtocolMessage = Annotated[
+    JsonDynaLabHello
+    | JsonConnectorHello
+    | JsonHandshakeAccepted
+    | JsonHandshakeRejected
+    | JsonHeartbeat
+    | JsonValueDescriptor
+    | JsonValueBatch,
+    Field(discriminator="type"),
+]

test/manual/peer.py

@@ -13,6 +13,13 @@ from rich.logging import RichHandler
 from dynalab_core.protocols.common import VersionDescriptor
 from dynalab_core.protocols.constants import PROTOCOL_VERSION
 from dynalab_core.protocols.json.wire import read_message, write_message
+from dynalab_core.protocols.packets import (
+    JsonConnectorHello,
+    JsonDynaLabHello,
+    JsonHeartbeat,
+    JsonValueBatch,
+    JsonValueDescriptor,
+)
 from dynalab_core.protocols.packets.data import ValueBatch, ValueDescriptor
 from dynalab_core.protocols.packets.handshake import (
     ConnectorHello,
@@ -124,13 +131,13 @@ def value_sender_thread(
                 tau * SINE_FREQUENCY_HZ * (perf_counter() - sine_start_time)
             )
             timestamp = monotonic_ns()
-            message = ValueBatch(values=[])
-            value1 = ValueDescriptor(
+            message = JsonValueBatch(values=[])
+            value1 = JsonValueDescriptor(
                 signal_id=signal_id_1,
                 value=2.0 * sine_value,
                 timestamp=timestamp,
             )
-            value2 = ValueDescriptor(
+            value2 = JsonValueDescriptor(
                 signal_id=signal_id_2,
                 value=sine_value,
                 timestamp=timestamp,
@@ -203,7 +210,7 @@ async def perform_handshake(
     except TimeoutError as exc:
         raise TimeoutError("Timed out waiting for server hello") from exc
 
-    if not isinstance(message, DynaLabHello):
+    if not isinstance(message, JsonDynaLabHello):
         raise RuntimeError(f"Expected DynaLabHello, received {type(message).__name__}")
 
     log.debug(
@@ -211,7 +218,7 @@ async def perform_handshake(
         message.instance_id,
     )
 
-    connector_hello = ConnectorHello(
+    connector_hello = JsonConnectorHello(
         connector_uuid=uuid4(),
         protocol_version=PROTOCOL_VERSION,
         connector_name="Test connector",
@@ -252,7 +259,7 @@ async def receive_messages(
     while True:
         message = await read_message(reader)
 
-        if isinstance(message, Heartbeat):
+        if isinstance(message, JsonHeartbeat):
             message.return_timestamp = monotonic_ms()
 
             await send_message(

test/test_json_server.py

@@ -10,7 +10,12 @@ from dynalab_core.config import CoreConfig
 from dynalab_core.errors import JsonServerError
 from dynalab_core.protocols.constants import PROTOCOL_VERSION
 from dynalab_core.protocols.common import VersionDescriptor
-from dynalab_core.protocols.packets.handshake import ConnectorHello, SignalDescriptor
+from dynalab_core.protocols.packets import JsonConnectorHello
+from dynalab_core.protocols.packets.handshake import (
+    ConnectorHello,
+    JsonSignalDescriptor,
+    SignalDescriptor,
+)
 from test.common import find_available_port
 
 
@@ -141,12 +146,12 @@ def test_rejected_handshake_is_not_logged_as_connected(
     port = find_available_port(8765)
     core = Core(CoreConfig(port=port))
     connector_uuid = uuid4()
-    connector_hello = ConnectorHello(
+    connector_hello = JsonConnectorHello(
         connector_uuid=connector_uuid,
         protocol_version=VersionDescriptor(type="alpha", major=999, minor=0, patch=0),
         connector_name="Incompatible connector",
         connector_version="0.1.0-test",
-        signals=[SignalDescriptor(id=uuid4(), name="Dummy signal", type="number")],
+        signals=[JsonSignalDescriptor(id=uuid4(), name="Dummy signal", type="number")],
     )
 
     with caplog.at_level(logging.DEBUG, logger="dynalab_core"):
@@ -176,12 +181,12 @@ def test_json_server_waits_for_connection_handlers_on_stop(
     port = find_available_port(8765)
     core = Core(CoreConfig(port=port))
     connector_uuid = uuid4()
-    connector_hello = ConnectorHello(
+    connector_hello = JsonConnectorHello(
         connector_uuid=connector_uuid,
         protocol_version=PROTOCOL_VERSION,
         connector_name="Test connector",
         connector_version="0.1.0-test",
-        signals=[SignalDescriptor(id=uuid4(), name="Dummy signal", type="number")],
+        signals=[JsonSignalDescriptor(id=uuid4(), name="Dummy signal", type="number")],
     )
 
     with caplog.at_level(logging.DEBUG, logger="dynalab_core"):