chore(release): 0.7.0-dev.1

Reviewed-on: #16

.gitignore

@@ -45,3 +45,6 @@ logs/
 # Sphinx
 docs/_build/
 docs/ref/modules/
+
+# known clients
+config/known_clients.yaml

.vscode/launch.json

@@ -7,6 +7,7 @@
       "request": "launch",
       "program": "${workspaceFolder}/src/judas_server/__main__.py",
       "console": "integratedTerminal",
+      "cwd": "${workspaceFolder}",
       "justMyCode": true
     }
   ]

CHANGELOG.md

@@ -2,6 +2,123 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.7.0-dev.1] - 2026-03-08
+
+### Features
+
+- [`d7b1368`](https://github.com/pufereq/template-repo/commit/d7b136851bafa2c20e1634bd5568f4bac839177f) **client_details.html**: add temporary initial telemetry display
+- [`7e9a9e6`](https://github.com/pufereq/template-repo/commit/7e9a9e6eede6cc926fef64c626434e65984befbc) **backend_server.py**: add `initial_telemetry` support
+- [`6ed03ab`](https://github.com/pufereq/template-repo/commit/6ed03ab74de8e91d13b5f1971a3f4cec890e4fef) **client.py**: add `Client.initial_telemetry` property
+- [`40c08d0`](https://github.com/pufereq/template-repo/commit/40c08d01693973f29f13c133a11fc5f166891a25) **initial_handler.py**: add handler for `TELEMETRY/INTIIAL` msgs
+
+### Build
+
+- [`3d13d24`](https://github.com/pufereq/template-repo/commit/3d13d241168b011c0044eb64db4b0fe70878d748) **uv.lock**: update judas_protocol to 0.9.1
+- [`28b57b6`](https://github.com/pufereq/template-repo/commit/28b57b6964bfcd6ce78f2a77822f7221f6e4f7e5) **uv.lock**: update judas_protocol to 0.9.0
+
+## [0.6.0] - 2026-03-05
+
+### Bug Fixes
+
+- [`fbb75c2`](https://github.com/pufereq/template-repo/commit/fbb75c263c13726d7e1c3fa28fb4e8f1f8cf0a17) **backend_server.py**: fix double-connection handling
+- [`88d3490`](https://github.com/pufereq/template-repo/commit/88d349090e6e3605800656cc3e85779bf4b417c3) **backend_server.py**: fix double disconnect if client.inbound empty
+- [`e308a07`](https://github.com/pufereq/template-repo/commit/e308a07dabcf20d9b080ce12a8928760dcde3057) **backend_server.py**: call `_initialize_handlers()` on init
+- [`ead2224`](https://github.com/pufereq/template-repo/commit/ead22240660ff9f723c36ee35fa5918c33a0c66d) **backend_server.py**: do not disconnect a client if Exception raised on msg handling
+- [`6446fe8`](https://github.com/pufereq/template-repo/commit/6446fe883cea4268992efc9f97cdb493af416576) **backend_server.py**: check if client to disconnect has an open socket
+
+### Features
+
+- [`72d51b4`](https://github.com/pufereq/template-repo/commit/72d51b451fc11ebe2f38d5e50bf263f9f441b03c) **backend_server.py**: add notice to known_clients.yaml
+- [`0e7c948`](https://github.com/pufereq/template-repo/commit/0e7c9486683be4ceb91203109986f0b9fc83eb8b) **config/**: add `config/` directory
+- [`97fc17f`](https://github.com/pufereq/template-repo/commit/97fc17fbb3ed5d681a4f5a0d488b7a2b09ab35df) **hello_handler.py**: remove client from `pending_hello` if recv'd HELLO
+- [`f5b14fc`](https://github.com/pufereq/template-repo/commit/f5b14fc6109e83730c4b13aaecf6f4314c0136a4) **backend_server.py**: add timeout on HELLO
+- [`bf1ad0e`](https://github.com/pufereq/template-repo/commit/bf1ad0ead0e4fc35c20d0d747cca05388b223d35) **ack_handler.py**: add handling for ACKs
+- [`a9bace8`](https://github.com/pufereq/template-repo/commit/a9bace8acaab07e6e5d02155a9966c6381ad107e) **backend_server.py**: add `ACK_TIMEOUT` constant
+- [`c88e39c`](https://github.com/pufereq/template-repo/commit/c88e39c7355b6f8c982198e6e56da2d09d17c61f) **backend_server.py**: track message ACKs and resend if no ACK recv'd within 5 seconds
+- [`dafe418`](https://github.com/pufereq/template-repo/commit/dafe418916485258694949538eda151d7da33695) **backend_server.py**: add warning if received an unknown message (no handler)
+- [`0ed478a`](https://github.com/pufereq/template-repo/commit/0ed478a88efa46f2f28b24371ad68010ecbf88d0) **backend_server.py**: implement message handling
+- [`c952413`](https://github.com/pufereq/template-repo/commit/c952413d912b7a5d2000bc48c11a4d9274533caf) **hello_handler.py**: add HELLO message handler
+- [`882c878`](https://github.com/pufereq/template-repo/commit/882c8780e15ec827fac1854cf7419b71d9a41a4f) **base_handler.py**: add `BaseHandler` class for message handling
+- [`faecc38`](https://github.com/pufereq/template-repo/commit/faecc382610daf890c90074809085560931fd178) **client_status.py**: move `ClientStatus` enum to own module
+
+### Miscellaneous Tasks
+
+- [`61be674`](https://github.com/pufereq/template-repo/commit/61be674258dcce8a5b54efddb7d1d856c6cba9bc) remove `cache/` directory
+- [`f46d271`](https://github.com/pufereq/template-repo/commit/f46d27164b79107abe405b221c9d424add55a723) **.gitignore**: ignore `config/known_clients.yaml` as it's generated automatically
+- [`f13f243`](https://github.com/pufereq/template-repo/commit/f13f243b5b389d84acaa4ab933a234a00c6a981c) **__main__.py**: set logging level for werkzeug to WARNING
+- [`332238b`](https://github.com/pufereq/template-repo/commit/332238b403782a08a8974b9267071f8d0ff5f006) **__init__.py**: correct version
+- [`e54cc47`](https://github.com/pufereq/template-repo/commit/e54cc479b5f6bb3fb887803122fea0c551e27ee2) **handler/__init__.py**: add `AckHandler` to `__all__`
+- [`ee38141`](https://github.com/pufereq/template-repo/commit/ee381414a931ed9d7562410e08c9de5cdc7b94e7) **backend_server.py**: remove redundant HELLO msg handling
+- [`ec58a52`](https://github.com/pufereq/template-repo/commit/ec58a5257a3007a6edd502eb3967d92a9b652358) **handler/__init__.py**: add module init
+- [`d3f68d3`](https://github.com/pufereq/template-repo/commit/d3f68d3baff8b903be125b0da7a88b415cd56bac) **backend/__init__.py**: add `Client` and `ClientStatus` to `__all__`
+- [`bda10a6`](https://github.com/pufereq/template-repo/commit/bda10a6248478e99dfb42d8c605996cafdaf1e6e) **cache/**: add cache/ directory
+
+### Refactor
+
+- [`efbf99f`](https://github.com/pufereq/template-repo/commit/efbf99f356c20fbd48937f1c4e8df0a2d57f0651) **backend_server.py**: if known_clients.yaml not present, call `_save_known_clients()`
+- [`35899d3`](https://github.com/pufereq/template-repo/commit/35899d366823c2878330eb06dc703f2965f61c3f) **backend_server.py**: move `known_clients.yaml` to `config/`
+- [`3eb681e`](https://github.com/pufereq/template-repo/commit/3eb681e233fa151c2476581854c947bdc77b4900) **backend_server.py**: move loading known clients to its own method
+- [`fa2da20`](https://github.com/pufereq/template-repo/commit/fa2da207a9cf3d90cdbfb5977033fee21d449528) **backend_server.py**: refactor calls to Message class constructors after protocol changes
+
+### Styling
+
+- [`62acc4b`](https://github.com/pufereq/template-repo/commit/62acc4b181cd359557909fa94f0cb0e6a4109255) **client.py**: correct property typing
+
+### Build
+
+- [`c64a258`](https://github.com/pufereq/template-repo/commit/c64a2582439e5ef1ab68bb9c588f7c4644bb4e07) **uv.lock**: update judas_protocol to 0.8.0
+- [`f41a777`](https://github.com/pufereq/template-repo/commit/f41a7774ec5cb4997005ac8e31ed7bdc3541a8d6) **uv.lock**: update judas_protocol to 0.7.0
+
+## [0.5.0] - 2026-02-28
+
+### Features
+
+- [`956da02`](https://github.com/pufereq/template-repo/commit/956da024c3bbe88d83f3ef7bfa37e380c22a04d9) **style.css**: make client list elements flexboxes
+- [`54eec65`](https://github.com/pufereq/template-repo/commit/54eec657a5a4822f5b1211cbc6843045165fe25d) **style.css**: use monospaced font only for heading
+- [`1900bf4`](https://github.com/pufereq/template-repo/commit/1900bf46cc6f103f6e9d359b9fd6af9a74d4cf4d) **client_details.html**: add basic client details
+- [`c5771dc`](https://github.com/pufereq/template-repo/commit/c5771dc3718b447878633b252bdd94b3e793aec9) **panel.html**: use client_details.html after clicking on client on sidebar
+- [`de9240e`](https://github.com/pufereq/template-repo/commit/de9240e6e0c683643df5bb9495c46cae64b0bc68) **backend_server.py**: set client status to STALE if offline for >24h
+- [`b1656cd`](https://github.com/pufereq/template-repo/commit/b1656cdfa95673bb19605d9358cb3c98a69f15d2) **client.py**: redo ClientStatuses adding PENDING and STALE
+- [`563de5a`](https://github.com/pufereq/template-repo/commit/563de5aa199a64946d9f41b84c6e2803aff45714) **backend_server.py**: add known_clients.yaml file for storing clients between server restarts
+- [`6971548`](https://github.com/pufereq/template-repo/commit/6971548589f098f850896ee49e833c7c1bce5efc) **web_server.py**: use client_details blueprint
+- [`31c5157`](https://github.com/pufereq/template-repo/commit/31c51574f7a2b92a959ddf9ae4c8cbf336494725) **client_details.py**: add client_details route
+- [`b652db9`](https://github.com/pufereq/template-repo/commit/b652db930f9a299c467b52acb22420e7ca280fb7) **style.css**: style no-connection-icon and client list
+- [`1dfddd2`](https://github.com/pufereq/template-repo/commit/1dfddd2fc7f4436010ddad31f50355073c8e4abb) **panel.html**: add a side panel client list
+- [`d20ff9b`](https://github.com/pufereq/template-repo/commit/d20ff9be6eeb9e283304ca6d60a4635a2f9b0ab6) **panel.html**: add a no connection icon to header
+- [`2bbe118`](https://github.com/pufereq/template-repo/commit/2bbe118de6290b1e014aa9c1a6f5f9d5b134d2e0) rename `details.html` -> `client_details.html`
+- [`29b4f3a`](https://github.com/pufereq/template-repo/commit/29b4f3a2ff34493d245eb0eb144dd52b0cc9b134) **css/style.css**: add `.button:active` color
+- [`69bf4f1`](https://github.com/pufereq/template-repo/commit/69bf4f13585f06c561c0746966bf95762c188bd0) **css/style.css**: add #content styling, make `main`'s flex column to fit `aside`
+- [`563dc62`](https://github.com/pufereq/template-repo/commit/563dc626246f379f1179179faa36d13b019b6a4e) **css/style.css**: include flaticon icons
+- [`bb229dc`](https://github.com/pufereq/template-repo/commit/bb229dc724ef9cec4c147c6c3d9f67b28eb700ce) **css/style.css**: make UI more compact
+- [`3077a98`](https://github.com/pufereq/template-repo/commit/3077a98d6fe7f34219c861120bc217929dc919d9) **backend_server.py**: add `send_close()` method
+
+### Miscellaneous Tasks
+
+- [`7f904fd`](https://github.com/pufereq/template-repo/commit/7f904fdcd50ac114cc584d7438675d5490b61bcd) **uv.lock**: add pyyaml to depedencies
+- [`f11b442`](https://github.com/pufereq/template-repo/commit/f11b442eced4781ee3be0102bd8ea0614bc378c4) **style.css**: style no connection message correctly
+- [`72a7433`](https://github.com/pufereq/template-repo/commit/72a74334e74f1a1a73d2ae11dd08e72a8a98b094) **pyproject.toml**: add pyyaml to depedencies
+- [`5ca5d9f`](https://github.com/pufereq/template-repo/commit/5ca5d9fcf4e8095b93cac1d72877769064895189) **.vscode/launch.json**: set cwd to workspace folder
+- [`0580a6b`](https://github.com/pufereq/template-repo/commit/0580a6be5390eb08a13eec0ce7c41219b1dca21a) **css/style.css**: remove transition from button hover bg color
+- [`97221bc`](https://github.com/pufereq/template-repo/commit/97221bc1b71112ac54168138bf5adc10acb920b5) **uv.lock**: update depedencies for Python 3.14
+
+### Refactor
+
+- [`a5e1ba8`](https://github.com/pufereq/template-repo/commit/a5e1ba88aeb06d337587e9dfd0a46520ef6c8d95) adapt for client.id
+- [`1e38be5`](https://github.com/pufereq/template-repo/commit/1e38be5ec5d55a30fd715a650ea7402b9fb4c546) **backend_server.py**: adapt client's `id` after refactor
+- [`b265feb`](https://github.com/pufereq/template-repo/commit/b265feba7a79ecd418bf8849a68a0633ae7d4778) **client.py**: rename `Client.mac_id` -> `Client.id`
+- [`840d9ce`](https://github.com/pufereq/template-repo/commit/840d9ce3c1838a3d88264fe895f933aea6c8cb4f) **login.html**: move elements from `main` to `#content`
+- [`9971981`](https://github.com/pufereq/template-repo/commit/9971981f666d4099132235fe0ecfb8e679745d95) **index.html**: move elements from `main` to `#content`
+- [`5510e9d`](https://github.com/pufereq/template-repo/commit/5510e9dd0874a1e3448a96eb8b8472b5599458a1) **backend_server.py**: rewrite `_handle_connection()` to minimize indents
+- [`1e02da1`](https://github.com/pufereq/template-repo/commit/1e02da185111f0e05651df0bf5c1df735f7dc6ff) **backend_server.py**: rename `_send_ack()` -> `send_ack()`
+
+### Styling
+
+- [`f54d974`](https://github.com/pufereq/template-repo/commit/f54d974745c7a0f5d8db619d86d585709649b8ec) **style.css**: remove commented-out code
+
+### Build
+
+- [`f01eaec`](https://github.com/pufereq/template-repo/commit/f01eaecba346715dd0c50eb4b253656df5c89ad8) **uv.lock**: update judas_protocol to 0.6.0
+
 ## [0.4.0] - 2025-11-30
 
 ### Bug Fixes

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "uv_build"
 
 [project]
 name = "judas_server"
-version = "0.4.0"
+version = "0.7.0-dev.1"
 description = "The backbone of the remote PC fleet management system."
 readme = "README.md"
 authors = []
@@ -14,6 +14,7 @@ dependencies = [
     "flask-login>=0.6.3",
     "flask-socketio>=5.5.1",
     "judas-protocol",
+    "pyyaml>=6.0.3",
 ]
 license = { text = "GPL-3.0+" }
 

src/judas_server/__init__.py

@@ -1 +1 @@
-__version__: str = "0.1.0"
+__version__: str = "0.5.0"

src/judas_server/__main__.py

@@ -12,6 +12,8 @@ if __name__ == "__main__":
         format="%(asctime)s : [%(levelname)s] : %(threadName)s : %(name)s :: %(message)s",
     )
 
+    lg.getLogger("werkzeug").setLevel(lg.WARNING)
+
     ladygaga_logger = lg.getLogger(f"{__name__}.LAGA_DYGA")
     ladygaga_logger.info(LADY_GAGA)
 

src/judas_server/backend/__init__.py

@@ -1,3 +1,5 @@
 from .backend_server import BackendServer
+from .client import Client
+from .client_status import ClientStatus
 
-__all__ = ["BackendServer"]
+__all__ = ["BackendServer", "Client", "ClientStatus"]

src/judas_server/backend/backend_server.py

@@ -6,15 +6,28 @@ import selectors
 import socket
 import threading
 import time
+from typing import TYPE_CHECKING, Any, Final
 
-from typing import Any
-
+from judas_protocol.types import TelemetryAction
+import yaml
 from judas_protocol import Category, ControlAction, Message
 
-from judas_server.backend.client import Client
+from judas_server.backend.client import Client, ClientStatus
+from judas_server.backend.handler.hello_handler import HelloHandler
+from judas_server.backend.handler.telemetry.initial_handler import (
+    InitialTelemetryHandler,
+)
+
+if TYPE_CHECKING:
+    from typing import Callable
+
+    from judas_protocol import ActionType
 
 
 class BackendServer:
+    ACK_TIMEOUT: Final[float] = 5.0  # seconds
+    HELLO_TIMEOUT: Final[float] = 3.0  # seconds
+
     def __init__(self, host: str = "0.0.0.0", port: int = 3692) -> None:
         """Initialize the backend server.
 
@@ -41,8 +54,96 @@ class BackendServer:
 
         self.clients: dict[str, Client] = {}
 
+        self.known_clients: dict[str, dict[str, str | float]] = {}
+        self.known_clients = self._load_known_clients()
+
+        self.message_handlers: dict[
+            tuple[Category, ActionType], Callable[[Client, Message], None]
+        ] = {}
+        self._initialize_handlers()
+
+        self.pending_acks: list[tuple[Client, Message, float]] = []
+        self.pending_hello: dict[Client, float] = {}
+
         self.running: bool = False
 
+    def _initialize_handlers(self) -> None:
+        """Initialize message handlers."""
+
+        hello_handler = HelloHandler(self)
+        initial_telemetry_handler = InitialTelemetryHandler(self)
+
+        self.message_handlers[(Category.CONTROL, ControlAction.HELLO)] = (
+            hello_handler.handle
+        )
+
+        self.message_handlers[
+            (Category.TELEMETRY, TelemetryAction.INITIAL)
+        ] = initial_telemetry_handler.handle
+
+    def _load_known_clients(self) -> dict[str, dict[str, str | float]]:
+        """Load the list of known clients from a YAML file and validate."""
+        known_clients: dict[str, dict[str, str | float]] = {}
+
+        try:
+            with open("config/known_clients.yaml", "r") as f:
+                data = yaml.safe_load(f)
+
+                if not isinstance(data, dict):
+                    raise ValueError("YAML root must be a dict")
+
+                known_clients = data.get("known_clients", {}) or {}
+
+                if not isinstance(known_clients, dict):
+                    raise ValueError("'known_clients' must be a dict")
+
+                for client_id, client_data in known_clients.items():
+                    if not isinstance(client_data, dict):
+                        raise ValueError(
+                            f"Client {client_id} data must be a dict"
+                        )
+                    last_seen = client_data.get("last_seen", 0.0)
+                    if not isinstance(last_seen, (float, int)):
+                        raise ValueError(
+                            f"Client {client_id} 'last_seen' must be a float or int"
+                        )
+
+                self.logger.debug(f"Loaded known clients: {known_clients}")
+                self.logger.info(f"Loaded {len(known_clients)} known clients")
+
+            for client_id in known_clients:
+                client = Client(id=client_id, addr=None, socket=None)
+                client.status = ClientStatus.OFFLINE
+                client.last_seen = float(
+                    known_clients[client_id].get("last_seen", 0.0)
+                )
+                client.initial_telemetry = known_clients[client_id].get(  # type: ignore
+                    "initial_telemetry", None
+                )
+                self.clients[client_id] = client
+
+        except FileNotFoundError:
+            self.logger.warning(
+                "known_clients.yaml not found, creating empty known clients list"
+            )
+            self._save_known_clients()
+        except Exception as e:
+            self.logger.error(f"Error loading known clients: {e}")
+            raise
+
+        return known_clients
+
+    def _save_known_clients(self) -> None:
+        """Save the list of known clients to a YAML file."""
+        with open("config/known_clients.yaml", "w") as f:
+            f.write(
+                "# This file is automatically generated by BackendServer.\n"
+                + "# Do not edit manually.\n"
+                + f"# Generated at: {time.strftime('%Y-%m-%d %H:%M:%S', time.localtime())}\n\n"
+            )
+            yaml.safe_dump({"known_clients": self.known_clients}, f)
+        self.logger.debug("Saved known clients")
+
     def _bind_socket(self, host: str, port: int) -> None:
         """Bind the server socket to the specified host and port.
 
@@ -62,6 +163,22 @@ class BackendServer:
                 )
                 time.sleep(1)
 
+    def send(self, client: Client, msg: Message) -> None:
+        """Send a message to a client.
+
+        Args:
+            client (Client): The client to send the message to.
+            msg (Message): The message to send.
+        """
+        msg_bytes: bytes = msg.to_bytes()
+        self.logger.info(
+            f"[>] Sending message {msg.id} to {client}, category: {msg.category}, action: {msg.action}, ack_required: {msg.ack_required}"
+        )
+        self.logger.debug(f"[>] Message bytes: {msg_bytes!r}")
+        if msg.ack_required:
+            self.pending_acks.append((client, msg, time.time()))
+        client.outbound += msg_bytes
+
     def send_ack(self, client: Client, target_id: str) -> None:
         """Send an ACK message to a client.
 
@@ -69,9 +186,9 @@ class BackendServer:
             client (Client): The client to send the ACK to.
             target_id (str): The id of the ACK'd message.
         """
-        ack: bytes = Message.ack(target_id=target_id).to_bytes()
+        ack: Message = Message.Control.ack(target_id=target_id)
         self.logger.info(f"[>] Sending ACK to {client}")
-        client.outbound += ack
+        self.send(client, ack)
 
     def send_close(self, client: Client) -> None:
         """Send a CLOSE message to a client.
@@ -79,9 +196,9 @@ class BackendServer:
         Args:
             client (Client): The client to send the CLOSE message to.
         """
-        close_msg: bytes = Message.close().to_bytes()
+        close_msg: Message = Message.Control.close()
         self.logger.info(f"[>] Sending CLOSE to {client}")
-        client.outbound += close_msg
+        self.send(client, close_msg)
 
     def _accept_connection(self, sock: socket.socket) -> None:
         """Accept a new client connection.
@@ -92,11 +209,13 @@ class BackendServer:
         conn, addr = sock.accept()
         self.logger.info(f"[+] Accepted connection from {addr}")
 
-        client = Client(mac_id=None, addr=addr, socket=conn)
+        client = Client(id=None, addr=addr, socket=conn)
 
         events = selectors.EVENT_READ | selectors.EVENT_WRITE
         self.selector.register(conn, events, data=client)
 
+        self.pending_hello[client] = time.time()
+
         self.logger.info(f"[+] Registered client {client}, HELLO pending...")
 
     def _disconnect(self, client: Client) -> None:
@@ -107,12 +226,19 @@ class BackendServer:
         """
         self.logger.info(f"[-] Disconnecting {client}...")
 
+        if client.socket is None or client.socket._closed:
+            self.logger.warning(
+                f"Client {client} has no socket, nothing to disconnect."
+            )
+            return
+
         try:
             self.selector.unregister(client.socket)
         except Exception as e:
             self.logger.error(f"Error unregistering client {client}: {e}")
 
         client.disconnect()
+        self._save_known_clients()
 
     def _send_outbound(self, sock: socket.socket, client: Client) -> None:
         """Queue data to be sent to a client.
@@ -164,47 +290,6 @@ class BackendServer:
         try:
             if mask & selectors.EVENT_READ:
                 self._receive_inbound(sock, client)
-                if not client.inbound:
-                    self._disconnect(client)
-                    return
-
-                if client.mac_id is None:
-                    # expect HELLO message
-                    try:
-                        msg = Message.from_bytes(client.inbound)
-                    except Exception as e:
-                        self.logger.error(
-                            f"Failed to parse HELLO message from {client}: {e}"
-                        )
-                        self._disconnect(client)
-                        return
-
-                    if (
-                        msg.category == Category.CONTROL
-                        and msg.action == ControlAction.HELLO
-                        and msg.payload.get("mac") is not None
-                    ):
-                        client.mac_id = msg.payload["mac"]
-                        if (
-                            client.mac_id in self.clients
-                            and self.clients[client.mac_id].status
-                            == "connected"
-                        ):
-                            old_client: Client = self.clients[client.mac_id]
-                            self.logger.warning(
-                                f"Client {client.mac_id} is already connected from {old_client.addr}, disconnecting old client..."
-                            )
-                            self.send_close(old_client)
-                            # self._disconnect(old_client)
-                            # TODO: tell client not to reconnect
-                        self.clients[client.mac_id] = client
-                        self.logger.info(f"[+] Registered new client {client}")
-                    else:
-                        self.logger.error(
-                            f"Expected HELLO message from {client}, got {msg}"
-                        )
-                        self._disconnect(client)
-                        return
 
                 while b"\n" in client.inbound:
                     line, client.inbound = client.inbound.split(b"\n", 1)
@@ -214,13 +299,40 @@ class BackendServer:
                     try:
                         msg = Message.from_bytes(line)
                         self.logger.info(f"[.] Parsed message {msg.id}")
+
+                        if client.id is None:
+                            self.logger.debug(
+                                f"Client {client} has no ID, expecting HELLO message..."
+                            )
+                            if (
+                                msg.category != Category.CONTROL
+                                or msg.action != ControlAction.HELLO
+                            ):
+                                self.logger.warning(
+                                    f"First message from {client} must be HELLO, disconnecting..."
+                                )
+                                self._disconnect(client)
+                                continue
+
+                        handler: Callable[[Client, Message], None] | None = (
+                            self.message_handlers.get(
+                                (msg.category, msg.action), None
+                            )
+                        )
+                        if handler is not None:
+                            handler(client, msg)
+                        else:
+                            self.logger.warning(
+                                f"No handler for message {msg.id} with category {msg.category} and action {msg.action}"
+                            )
+                            continue
+
                         if msg.ack_required:
                             self.send_ack(client, target_id=msg.id)
                     except Exception as e:
                         self.logger.error(
                             f"Failed to parse message from {client}: {e}"
                         )
-                        self._disconnect(client)
                         return
 
             if mask & selectors.EVENT_WRITE and client.outbound:
@@ -251,6 +363,34 @@ class BackendServer:
                         self._accept_connection(key.fileobj)  # type: ignore
                     else:
                         self._handle_connection(key, mask)
+
+                # update client statuses
+                now = time.time()
+                for client in self.clients.values():
+                    if (
+                        client.status == ClientStatus.OFFLINE
+                        and now - client.last_seen > 60 * 60 * 24  # 24 hours
+                    ):
+                        self.clients[client.id].status = ClientStatus.STALE
+
+                # check pending ACKs
+                for client, msg, timestamp in self.pending_acks[:]:
+                    if time.time() - timestamp > self.ACK_TIMEOUT:
+                        self.logger.warning(
+                            f"ACK timeout for message {msg.id} to {client}, resending..."
+                        )
+                        self.send(client, msg)
+                        self.pending_acks.remove((client, msg, timestamp))
+
+                # check pending HELLOs
+                for client, timestamp in list(self.pending_hello.items()):
+                    if time.time() - timestamp > self.HELLO_TIMEOUT:
+                        self.logger.warning(
+                            f"HELLO timeout for {client}, disconnecting..."
+                        )
+                        self._disconnect(client)
+                        del self.pending_hello[client]
+
                 time.sleep(0.001)  # prevent 100% CPU usage
 
         except Exception as e:
@@ -267,8 +407,9 @@ class BackendServer:
             self.logger.warning(f"Client {client_id} not found")
             return None
         return {
-            "id": client.mac_id,
+            "id": client.id,
             "addr": client.addr,
             "last_seen": client.last_seen,
             "status": client.status,
+            "initial_telemetry": client.initial_telemetry,
         }

src/judas_server/backend/client.py

@@ -5,24 +5,25 @@ from __future__ import annotations
 
 import logging as lg
 import socket
-from enum import Enum
+import time
+from typing import Any
 
-
-class ClientStatus(str, Enum):
-    CONNECTED = "connected"
-    DISCONNECTED = "disconnected"
+from judas_server.backend.client_status import ClientStatus
 
 
 class Client:
     """Represents a client."""
 
     def __init__(
-        self, mac_id: str | None, addr: tuple[str, int], socket: socket.socket
+        self,
+        id: str | None,
+        addr: tuple[str, int] | None,
+        socket: socket.socket | None,
     ) -> None:
         """Initialize the client.
 
         Args:
-            mac_id (str | None): The unique identifier for the client.
+            id (str | None): The unique identifier for the client.
                 Can be None if not yet assigned.
             addr (tuple[str, int]): The (IP, port) address of the client.
             socket (socket.socket): The socket object for communication.
@@ -32,27 +33,38 @@ class Client:
         )
         self.logger.debug(f"Initializing Client {addr}...")
 
-        self.mac_id: str | None = mac_id
+        self.id: str | None = id
         self.last_seen: float = 0.0  # unix timestanp of last inbound message
-        self.status: ClientStatus = ClientStatus.CONNECTED
+        self.status: ClientStatus = ClientStatus.PENDING
 
-        self.socket: socket.socket = socket
-        self.addr: tuple[str, int] = addr
+        self.socket: socket.socket | None = socket
+        self.addr: tuple[str, int] | None = addr
         self.inbound: bytes = b""
         self.outbound: bytes = b""
 
+        self.initial_telemetry: dict[str, Any] | None = None
+
     def __str__(self) -> str:
-        return f"Client({self.mac_id} ({self.addr[0]}:{self.addr[1]}))"
+        if self.addr:
+            return f"Client({self.id} ({self.addr[0]}:{self.addr[1]}))"
+        return f"Client({self.id} (not connected))"
 
     def __repr__(self) -> str:
-        return f"Client({self.mac_id}, {self.addr})"
+        return f"Client({self.id}, {self.addr})"
 
     def disconnect(self) -> None:
         """Disconnect the client and close the socket."""
         self.logger.debug(f"Disconnecting Client {self}...")
+        if self.socket is None:
+            self.logger.warning(
+                f"Client {self} not connected, nothing to disconnect."
+            )
+            return
         try:
             self.socket.close()
         except Exception as e:
             self.logger.error(f"Error closing socket for Client {self}: {e}")
-        self.status = ClientStatus.DISCONNECTED
+        self.status = ClientStatus.OFFLINE
+        self.last_seen = time.time()
+
         self.logger.info(f"Client {self} disconnected.")

src/judas_server/backend/client_status.py

@@ -0,0 +1,11 @@
+# -*- coding: utf-8 -*-
+from enum import Enum
+
+
+class ClientStatus(str, Enum):
+    """Enumeration of client connection statuses."""
+
+    ONLINE = "online"
+    PENDING = "pending"
+    OFFLINE = "offline"
+    STALE = "stale"

src/judas_server/backend/handler/__init__.py

@@ -0,0 +1,5 @@
+from .base_handler import BaseHandler
+from .hello_handler import HelloHandler
+from .ack_handler import AckHandler
+
+__all__ = ["BaseHandler", "HelloHandler", "AckHandler"]

src/judas_server/backend/handler/ack_handler.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+
+from typing import TYPE_CHECKING
+
+from .base_handler import BaseHandler
+
+if TYPE_CHECKING:
+    from judas_protocol import Message
+
+    from judas_server.backend import BackendServer, Client
+
+
+class AckHandler(BaseHandler):
+    def __init__(self, backend_server: BackendServer) -> None:
+        super().__init__(backend_server)
+
+    def handle(self, client: Client, message: Message) -> None:
+        pending_acks = self.backend_server.pending_acks
+        if message.id in pending_acks:
+            del pending_acks[message.id]
+            self.logger.debug(
+                f"[*] Received ACK for message {message.id} from {client}."
+            )
+        else:
+            self.logger.warning(
+                f"[!] Received ACK for unknown (or ACK'd) message {message.id} from {client}."
+            )

src/judas_server/backend/handler/base_handler.py

@@ -0,0 +1,41 @@
+# -*- coding: utf-8 -*-
+from __future__ import annotations
+
+import logging as lg
+from typing import TYPE_CHECKING
+
+from judas_server.backend.client import Client
+
+if TYPE_CHECKING:
+    from judas_protocol import Message
+
+    from judas_server.backend import BackendServer
+
+
+class BaseHandler:
+    """BaseHandler is the base class for all message handlers in the backend server.
+
+    It defines the interface for handling messages and provides common functionality for all handlers.
+    """
+
+    def __init__(self, backend_server: BackendServer) -> None:
+        """Initialize the BaseHandler with a reference to the backend server.
+
+        Args:
+            backend_server (BackendServer): The backend server instance that this handler belongs to.
+        """
+        self.logger: lg.Logger = lg.getLogger(
+            f"{__name__}.{self.__class__.__name__}"
+        )
+        self.backend_server: BackendServer = backend_server
+
+    def handle(self, client: Client, message: Message) -> None:
+        """Handle a message from a client.
+
+        This method must be implemented by subclasses to define the specific handling logic for different message types.
+
+        Args:
+            client (Client): The client that sent the message.
+            message (Message): The message to be handled.
+        """
+        raise NotImplementedError("handle() must be implemented by subclasses")

src/judas_server/backend/handler/hello_handler.py

@@ -0,0 +1,66 @@
+# -*- coding: utf-8 -*-
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, override
+
+from judas_protocol import Category, ControlAction, Message
+
+from judas_server.backend.client import ClientStatus
+from judas_server.backend.handler import BaseHandler
+
+if TYPE_CHECKING:
+    from judas_server.backend.backend_server import BackendServer
+    from judas_server.backend.client import Client
+
+
+class HelloHandler(BaseHandler):
+    def __init__(self, backend_server: BackendServer) -> None:
+        super().__init__(backend_server)
+
+    @override
+    def handle(self, client: Client, message: Message) -> None:
+        if client.id is not None:
+            return
+
+        if (
+            message.category != Category.CONTROL
+            or message.action != ControlAction.HELLO
+        ):
+            self.logger.error(
+                f"Expected HELLO message from {client}, got {message}, disconnecting client..."
+            )
+            self.backend_server._disconnect(client)
+            return
+
+        if message.payload.get("id") is None:
+            self.logger.error(
+                f"HELLO message from {client} missing 'id' field, disconnecting client..."
+            )
+            self.backend_server._disconnect(client)
+            return
+
+        client.id = message.payload["id"]
+
+        # check if client already connected, if so disconnect old client and register new one
+        if (
+            client.id in self.backend_server.clients
+            and self.backend_server.clients[client.id].status
+            == ClientStatus.ONLINE
+        ):
+            old_client: Client = self.backend_server.clients[client.id]
+            self.backend_server.logger.warning(
+                f"Client {client.id} is already connected from {old_client.addr}, disconnecting old client..."
+            )
+            self.backend_server.send_close(old_client)
+            return
+
+        self.backend_server.clients[client.id] = client  # type: ignore
+        self.backend_server.known_clients[client.id] = {  # type: ignore
+            "last_seen": client.last_seen
+        }
+
+        del self.backend_server.pending_hello[client]
+        self.backend_server._save_known_clients()
+        client.status = ClientStatus.ONLINE
+
+        self.logger.info(f"[+] Registered new client {client}")

src/judas_server/backend/handler/telemetry/initial_handler.py

@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+"""Initial telemetry handler."""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from judas_protocol import Message
+
+from judas_server.backend.handler.base_handler import BaseHandler
+
+if TYPE_CHECKING:
+    from judas_server.backend import BackendServer
+    from judas_server.backend.client import Client
+
+
+class InitialTelemetryHandler(BaseHandler):
+    """Handles the initial telemetry message from a client."""
+
+    def __init__(self, backend_server: BackendServer) -> None:
+        """Initialize the handler."""
+        super().__init__(backend_server)
+
+    def handle(self, client: Client, message: Message) -> None:
+        """Handle the initial telemetry message."""
+        self.logger.debug(
+            f"Handling initial telemetry message from {client}..."
+        )
+
+        client.initial_telemetry = message.payload
+        self.backend_server.known_clients[client.id]["initial_telemetry"] = (  # type: ignore
+            message.payload
+        )

src/judas_server/web/static/css/style.css

@@ -14,7 +14,7 @@
 
 body {
   background-color: var(--ctp-base);
-  font-family: monospace, sans-serif !important;
+  font-family: sans-serif;
   color: var(--ctp-text);
 }
 
@@ -47,10 +47,13 @@ header {
   justify-content: space-between;
   align-items: center;
   background-color: var(--ctp-mantle);
-  /* color: var(--ctp-text); */
   padding: 0.5rem 1rem;
 }
 
+header h2 {
+  font-family: monospace, sans-serif;
+}
+
 main {
   display: flex;
   flex-grow: 1;
@@ -85,11 +88,6 @@ header a {
   text-decoration: none;
 }
 
-/* .button a:hover { */
-/*     color: var(--nord-bg0); */
-/*     text-decoration: none; */
-/* } */
-
 .button:hover {
   background-color: var(--ctp-mauve);
   cursor: pointer;
@@ -147,7 +145,6 @@ header a {
 
 .select-table a {
   display: block;
-  /* color: var(--nord-acc0); */
   text-decoration: none;
   transition: 0.1s ease-in-out;
 }
@@ -224,7 +221,12 @@ header a {
   opacity: 0.8;
 }
 
-#no-connection-icon {
+#no-connection-message {
+  color: var(--ctp-red);
+}
+
+#no-connection-message i {
+  padding-right: 0.5rem;
   font-size: 1.5rem;
   vertical-align: middle;
   color: var(--ctp-red);
@@ -237,6 +239,9 @@ ul#client-list {
 }
 
 ul#client-list li {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
   padding: 0 0.5rem;
   cursor: default;
 }
@@ -245,9 +250,14 @@ ul#client-list li:hover {
   background-color: var(--ctp-surface0);
 }
 
+ul#client-list li i {
+  line-height: 0;
+}
+
 ul#client-list li a {
   display: block;
+  width: 100%;
   color: var(--ctp-text);
   text-decoration: none;
-  transition: 0.1s ease-in-out;
+  cursor: default;
 }

src/judas_server/web/templates/client_details.html

@@ -4,6 +4,34 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Details for client {{ client.id }}</title>
+    <link
+      rel="stylesheet"
+      href="{{ url_for('static', filename='css/style.css') }}"
+    />
   </head>
-  <body></body>
+  <body>
+    <h1>Details for client {{ client.id }}</h1>
+    <p><strong>ID:</strong> {{ client.id }}</p>
+    <p><strong>IP Address:</strong> {{ client.addr[0] }}</p>
+    <p><strong>Port:</strong> {{ client.addr[1] }}</p>
+    <p>
+      <strong>Last Seen:</strong>
+      <span id="last-seen">{{ client.last_seen }}</span>
+    </p>
+    <p>
+      <strong>Initial:</strong>
+      <pre>{{ client.initial_telemetry | tojson(indent=2) }}</pre>
+    </p>
+  </body>
+
+  <script>
+    function updateLastSeen() {
+      const lastSeenElement = document.getElementById("last-seen");
+      const lastSeenTimestamp = parseInt(lastSeenElement.textContent);
+      const lastSeenDate = new Date(lastSeenTimestamp * 1000);
+      lastSeenElement.textContent = lastSeenDate.toLocaleString();
+    }
+
+    updateLastSeen();
+  </script>
 </html>

src/judas_server/web/templates/panel.html

@@ -13,7 +13,6 @@
     <script>
       $(document).ready(function () {
         const socket = io();
-        const dataElement = $("#data");
 
         const showNotify = (message) => {
           $("#notify").stop().fadeIn();
@@ -23,47 +22,161 @@
           }, 3000);
         };
 
+        const loadClientDetails = (clientId) => {
+          fetch(`/client/${clientId}`)
+            .then((response) => response.text())
+            .then((html) => {
+              $("#content").html(html);
+            })
+            .catch((error) => {
+              console.error("Error fetching client details:", error);
+            });
+        };
+
+        // load client_details for the client specified in the URL hash
+        const hash = window.location.hash;
+        if (hash) {
+          const clientId = hash.substring(1);
+          loadClientDetails(clientId);
+        }
+
         $("#notify").hide();
 
         socket.on("connect", () => {
           console.log("Connected to server");
-          $("#no-connection-icon").hide();
+          $("#no-connection-message").hide();
           showNotify("Connected to server");
         });
 
         socket.on("disconnect", () => {
           console.log("Disconnected from server");
-          $("#no-connection-icon").show();
+          $("#no-connection-message").show();
           showNotify("Disconnected from server");
         });
 
         socket.on("update_data", (data) => {
-          console.log("Received data:", data);
-          document.getElementById("data").innerHTML = JSON.stringify(
-            data,
-            null,
-            2,
+          const clientList = $("#client-list");
+          const existingItems = {};
+
+          // Index current <li> by clientId
+          clientList.children("li").each(function () {
+            const a = $(this).find("a");
+            if (a.length) {
+              const clientId = a.attr("href").substring(1);
+              existingItems[clientId] = $(this);
+            }
+          });
+
+          // Track which clientIds are still present
+          const seen = new Set();
+
+          Object.entries(data).forEach(([clientId, client]) => {
+            seen.add(clientId);
+
+            // Build icon
+            const iconElement = document.createElement("i");
+            switch (client.status) {
+              case "online":
+                iconElement.className = "fi fi-sr-play";
+                iconElement.style.color = "var(--ctp-green)";
+                break;
+              case "offline":
+                iconElement.className = "fi fi-sr-stop";
+                iconElement.style.color = "var(--ctp-red)";
+                break;
+              case "pending":
+                iconElement.className = "fi fi-sr-pending";
+                iconElement.style.color = "var(--ctp-yellow)";
+                break;
+              case "stale":
+                iconElement.className = "fi fi-sr-skull";
+                iconElement.style.color = "var(--ctp-orange)";
+                break;
+              default:
+                iconElement.className = "fi fi-rr-question";
+                iconElement.style.color = "var(--ctp-gray)";
+            }
+
+            // Time since last seen
+            const lastSeen = new Date(client.last_seen * 1000);
+            const now = new Date();
+            const timeSinceLastSeen = Math.floor((now - lastSeen) / 1000);
+            const days = Math.floor(timeSinceLastSeen / 86400);
+            const hours = Math.floor((timeSinceLastSeen % 86400) / 3600);
+            const minutes = Math.floor((timeSinceLastSeen % 3600) / 60);
+            const seconds = timeSinceLastSeen % 60;
+            let timeSinceLastSeenText = "";
+            if (days > 0) timeSinceLastSeenText += `${days}d `;
+            if (hours > 0) timeSinceLastSeenText += `${hours}h `;
+            if (minutes > 0) timeSinceLastSeenText += `${minutes}m `;
+            if (seconds > 0) timeSinceLastSeenText += `${seconds}s`;
+
+            timeSinceLastSeenText = timeSinceLastSeenText.trim() || "0s";
+
+            let statusText = `${client.id} (${timeSinceLastSeenText})`;
+
+            // check if <li> exists
+            if (existingItems[clientId]) {
+              // update if needed
+              const li = existingItems[clientId];
+              const a = li.find("a");
+              if (a.text() !== statusText) {
+                a.text(statusText);
+              }
+
+              li.attr(
+                "title",
+                `Status: ${client.status}\nLast Seen: ${lastSeen.toISOString()}`,
               );
 
-          // Update client list
-          const clientList = $("#client-list");
+              // update icon
+              const icon = li.find("i")[0];
+              if (icon) {
+                icon.className = iconElement.className;
+                icon.style.color = iconElement.style.color;
+              }
+            } else {
+              // add new <li>
+              const li = $("<li></li>");
+              li.append(iconElement);
+              const a = $("<a></a>")
+                .text(statusText)
+                .attr("href", `#${clientId}`);
 
-          clientList.empty();
-          Object.entries(data).forEach(([clientId, client]) => {
-            const listItem = document.createElement("li");
+              li.attr(
+                "title",
+                `Status: ${client.status}\nLast Seen: ${lastSeen.toISOString()}`,
+              );
 
-            const iconElement = document.createElement("i");
-            iconElement.classList.add("fi", "fi-sr-play");
-            iconElement.style.color = "var(--ctp-green)";
-            listItem.appendChild(iconElement);
-
-            const spanElement = document.createElement("a");
-            spanElement.appendChild(document.createTextNode(clientId));
-            spanElement.href = `#${clientId}`;
-
-            listItem.appendChild(spanElement);
-            clientList.append(listItem);
+              li.append(a);
+              clientList.append(li);
+            }
           });
+
+          // Remove <li> for clients no longer present
+          Object.keys(existingItems).forEach((clientId) => {
+            if (!seen.has(clientId)) {
+              existingItems[clientId].remove();
+            }
+          });
+
+          // Re-bind click handlers
+          $("#client-list li > a")
+            .off("click")
+            .on("click", function (e) {
+              const href = $(this).attr("href");
+              if (href.startsWith("#")) {
+                const clientId = href.substring(1);
+                loadClientDetails(clientId);
+                $("#client-list li > a").removeClass("active");
+                $(this).addClass("active");
+              }
+            });
+
+          if (window.location.hash) {
+            const clientId = window.location.hash.substring(1);
+            loadClientDetails(clientId);
+          }
         });
       });
     </script>
@@ -72,21 +185,18 @@
     <div id="wrapper">
       <header>
         <h2><a href="{{ url_for('index.index') }}">judas</a></h2>
-        <p>
-          <span id="no-connection-icon" style="display: none">
+        <p id="no-connection-message">
           <i class="fi fi-rr-link-slash"></i>
-          </span>
-          <a class="button" href="{{ url_for('auth.logout') }}">Logout</a>
+          <span> No connection to server </span>
         </p>
+        <a class="button" href="{{ url_for('auth.logout') }}">Logout</a>
       </header>
       <div id="notify"></div>
       <main>
         <aside>
           <ul id="client-list"></ul>
         </aside>
-        <div id="content">
-          <pre id="data"></pre>
-        </div>
+        <div id="content"></div>
       </main>
     </div>
   </body>

uv.lock

@@ -358,18 +358,19 @@ wheels = [
 
 [[package]]
 name = "judas-protocol"
-version = "0.5.0"
-source = { git = "https://gitea.pufereq.pl/judas/judas_protocol.git#c48b69ecee16f5824ffd8bce8921341d5fa326b7" }
+version = "0.9.1"
+source = { git = "https://gitea.pufereq.pl/judas/judas_protocol.git#085c34f232f95313d66db48a7d17bc25c92a35ae" }
 
 [[package]]
 name = "judas-server"
-version = "0.4.0"
+version = "0.7.0.dev1"
 source = { editable = "." }
 dependencies = [
     { name = "flask" },
     { name = "flask-login" },
     { name = "flask-socketio" },
     { name = "judas-protocol" },
+    { name = "pyyaml" },
 ]
 
 [package.dev-dependencies]
@@ -394,6 +395,7 @@ requires-dist = [
     { name = "flask-login", specifier = ">=0.6.3" },
     { name = "flask-socketio", specifier = ">=5.5.1" },
     { name = "judas-protocol", git = "https://gitea.pufereq.pl/judas/judas_protocol.git" },
+    { name = "pyyaml", specifier = ">=6.0.3" },
 ]
 
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 ]
 
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