diff --git a/readme.txt b/readme.txt
index eb05055..b6a1ba7 100644
--- a/readme.txt
+++ b/readme.txt
@@ -2,8 +2,8 @@
 Et Python-basert verktøy som splitter innkommende TCP-trafikk til flere mål samtidig.
 
 ## Start
-Kjør `tcp_splitter.py` for å starte programmet.
-Scriptet `worker.py` blir startet automatisk av hovedscriptet, og restartes med jevne mellomrom basert på verdien satt i `config.json`.
+Kjør `worker.exe` for å starte programmet.
+Scriptet `tcp_splitter.exe` blir startet automatisk av hovedscriptet, og restartes med jevne mellomrom basert på verdien satt i `config.json`.
 
 ---
 
diff --git a/tcp_splitter.exe b/tcp_splitter.exe
new file mode 100644
index 0000000..b6d6955
Binary files /dev/null and b/tcp_splitter.exe differ
diff --git a/tcp_splitter.py b/tcp_splitter.py
index 91d5f2a..14b41fc 100644
--- a/tcp_splitter.py
+++ b/tcp_splitter.py
@@ -1,26 +1,300 @@
-import subprocess
-import time
+#!/usr/bin/env python3
+# tcp_splitter.py
+import argparse
+import asyncio
+import json
+import logging
+import signal
+import socket
+import sys
+import os
+import ctypes
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Callable, Awaitable, List, Optional
 
-while True:
-    # Get the current time and print it when starting the process
-    restart_time = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
-    print(f"Starting worker script at {restart_time}")
+BUF_SIZE = 64 * 1024
+DEFAULT_MIRROR_BUF = 1 * 1024 * 1024  # 1 MiB
 
-    # Start the worker script in a new Command Prompt window with a custom title
-    process = subprocess.Popen(['start', 'cmd', '/c', 'title TCP_SPLITTER && worker.exe'], shell=True)
+def set_console_title(title: Optional[str]):
+    if os.name == "nt" and title:
+        try:
+            ctypes.windll.kernel32.SetConsoleTitleW(str(title))
+        except Exception:
+            pass
 
-    # Wait a moment to allow the process to start
-    time.sleep(2)
+def set_socket_opts(writer: asyncio.StreamWriter) -> None:
+    sock = writer.get_extra_info("socket")
+    if not sock:
+        return
+    for opt in (
+        (socket.IPPROTO_TCP, socket.TCP_NODELAY, 1),
+        (socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1),
+    ):
+        try: sock.setsockopt(*opt)
+        except Exception: pass
 
+@dataclass
+class Target:
+    host: str
+    port: int
+
+@dataclass
+class Config:
+    listen_host: str
+    listen_port: int
+    primary: Target
+    backups: List[Target]
+    run_duration: int
+    log_level: int
+    mirror_buffer_bytes: int = DEFAULT_MIRROR_BUF
+    idle_timeout: float = 0.0
+
+def _level_from_name(name: str) -> int:
+    try:
+        lvl = getattr(logging, str(name).upper())
+        return lvl if isinstance(lvl, int) else logging.INFO
+    except Exception:
+        return logging.INFO
+
+def resolve_default_config_path() -> Path:
+    base = Path(sys.executable).parent if getattr(sys, "frozen", False) else Path(__file__).resolve().parent
+    cfg = base / "config.json"
+    return cfg if cfg.exists() else Path.cwd() / "config.json"
+
+def load_config(path: Path) -> Config:
+    if not path.exists():
+        raise FileNotFoundError(f"Config not found: {path}")
+    raw = json.loads(path.read_text(encoding="utf-8"))
+    targets = raw["target_hosts"]
+    if not isinstance(targets, list) or not targets:
+        raise ValueError("config.target_hosts must contain at least one entry")
+    primary = Target(str(targets[0]["host"]), int(targets[0]["port"]))
+    backups = [Target(str(t["host"]), int(t["port"])) for t in targets[1:]]
+    return Config(
+        listen_host=str(raw["listen_host"]),
+        listen_port=int(raw["listen_port"]),
+        primary=primary,
+        backups=backups,
+        run_duration=int(raw.get("run_duration", 0) or 0),
+        log_level=_level_from_name(raw.get("log_level", "INFO")),
+        mirror_buffer_bytes=int(raw.get("mirror_buffer_bytes", DEFAULT_MIRROR_BUF)),
+        idle_timeout=float(raw.get("idle_timeout", 0.0)),
+    )
+
+class MirrorBuffer:
+    def __init__(self, max_bytes: int):
+        self._q: asyncio.Queue[bytes] = asyncio.Queue()
+        self._bytes = 0
+        self._max = max_bytes
+        self._closed = False
+        self._lock = asyncio.Lock()
+    @property
+    def closed(self) -> bool: return self._closed
+    async def close(self):
+        async with self._lock:
+            self._closed = True
+            while not self._q.empty():
+                try:
+                    self._q.get_nowait(); self._q.task_done()
+                except Exception: break
+    async def put_nowait(self, data: bytes):
+        if self._closed: return
+        async with self._lock:
+            new_total = self._bytes + len(data)
+            if new_total > self._max:
+                raise asyncio.QueueFull()
+            self._bytes = new_total
+            self._q.put_nowait(data)
+    async def get(self) -> bytes:
+        data = await self._q.get()
+        async with self._lock:
+            self._bytes -= len(data)
+        self._q.task_done()
+        return data
+    def empty(self) -> bool: return self._q.empty()
+
+@dataclass
+class MirrorCtl:
+    name: str
+    buf: MirrorBuffer
+    disable: Callable[[], Awaitable[None]]
+    active: bool = True
+
+async def pump(reader: asyncio.StreamReader, writer: asyncio.StreamWriter, *,
+               label: str, idle_timeout: float = 0.0,
+               mirrors: Optional[List[MirrorCtl]] = None):
+    set_socket_opts(writer)
     while True:
-        # Check if the specific titled process is still running
-        result = subprocess.run('tasklist /v | findstr "TCP_SPLITTER"', shell=True, stdout=subprocess.PIPE, text=True)
+        try:
+            data = await (asyncio.wait_for(reader.read(BUF_SIZE), timeout=idle_timeout) if idle_timeout > 0 else reader.read(BUF_SIZE))
+        except asyncio.TimeoutError:
+            logging.info("%s: idle timeout; closing direction", label); break
+        if not data: break
+        writer.write(data)
+        try: await writer.drain()
+        except ConnectionError:
+            logging.info("%s: downstream closed; stopping", label); break
+        if mirrors:
+            for m in mirrors:
+                if not m.active or m.buf.closed: continue
+                try: await m.buf.put_nowait(data)
+                except asyncio.QueueFull:
+                    m.active = False
+                    logging.warning("%s: mirror '%s' overflow -> disabling", label, m.name)
+                    try: await m.disable()
+                    except Exception: pass
 
-        # If "TCP_SPLITTER" title is not found, the worker script has stopped
-        if "TCP_SPLITTER" not in result.stdout:
-            exit_time = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
-            print(f"Worker script exited at {exit_time}. Restarting...")
-            break  # Exit the inner loop to restart the outer loop and launch the script again
+async def mirror_writer_task(name: str, writer: asyncio.StreamWriter, mbuf: MirrorBuffer):
+    set_socket_opts(writer)
+    try:
+        while not mbuf.closed:
+            if mbuf.empty() and mbuf.closed: break
+            data = await mbuf.get()
+            if not data: continue
+            writer.write(data)
+            try: await writer.drain()
+            except ConnectionError:
+                logging.info("backup '%s': writer closed", name); break
+    except asyncio.CancelledError:
+        pass
+    finally:
+        try: writer.close(); await writer.wait_closed()
+        except Exception: pass
 
-        # Check every second if the script is still running
-        time.sleep(1)
+async def discard_task(name: str, reader: asyncio.StreamReader):
+    try:
+        while True:
+            if not await reader.read(BUF_SIZE): break
+    except asyncio.CancelledError:
+        pass
+    except Exception as e:
+        logging.debug("backup '%s': discard exception: %r", name, e)
+
+async def handle_client(client_reader: asyncio.StreamReader, client_writer: asyncio.StreamWriter, cfg: Config):
+    peer = client_writer.get_extra_info("peername")
+    conn_id = f"{peer[0]}:{peer[1]}" if isinstance(peer, tuple) else "unknown"
+    logging.info("[%s] accepted", conn_id)
+    set_socket_opts(client_writer)
+    try:
+        p_reader, p_writer = await asyncio.open_connection(cfg.primary.host, cfg.primary.port)
+        set_socket_opts(p_writer)
+        logging.debug("[%s] connected primary %s:%d", conn_id, cfg.primary.host, cfg.primary.port)
+    except Exception as e:
+        logging.error("[%s] failed to connect primary %s:%d: %s", conn_id, cfg.primary.host, cfg.primary.port, e)
+        client_writer.close(); await client_writer.wait_closed(); return
+
+    mirror_ctls: List[MirrorCtl] = []
+    mirror_tasks: List[asyncio.Task] = []
+
+    async def mk_disable(w: Optional[asyncio.StreamWriter], buf: MirrorBuffer):
+        async def _disable():
+            try: await buf.close()
+            except Exception: pass
+            if w:
+                try: w.close(); await w.wait_closed()
+                except Exception: pass
+        return _disable
+
+    for tgt in cfg.backups:
+        name = f"{tgt.host}:{tgt.port}"
+        try:
+            b_reader, b_writer = await asyncio.open_connection(tgt.host, tgt.port)
+            set_socket_opts(b_writer)
+            mbuf = MirrorBuffer(cfg.mirror_buffer_bytes)
+            disable_cb = await mk_disable(b_writer, mbuf)
+            ctl = MirrorCtl(name=name, buf=mbuf, disable=disable_cb, active=True)
+            mirror_ctls.append(ctl)
+            mirror_tasks += [
+                asyncio.create_task(mirror_writer_task(name, b_writer, mbuf)),
+                asyncio.create_task(discard_task(name, b_reader)),
+            ]
+            logging.debug("[%s] connected backup %s", conn_id, name)
+        except Exception as e:
+            logging.warning("[%s] cannot connect backup %s: %s (disabled)", conn_id, name, e)
+
+    c2p = asyncio.create_task(pump(client_reader, p_writer, label=f"[{conn_id}] client->primary",
+                                   idle_timeout=cfg.idle_timeout, mirrors=mirror_ctls))
+    p2c = asyncio.create_task(pump(p_reader, client_writer, label=f"[{conn_id}] primary->client",
+                                   idle_timeout=cfg.idle_timeout))
+
+    try:
+        await asyncio.wait([c2p, p2c], return_when=asyncio.FIRST_COMPLETED)
+    finally:
+        for obj in (p_writer, client_writer):
+            try: obj.close(); await obj.wait_closed()
+            except Exception: pass
+        for ctl in mirror_ctls:
+            try: await ctl.disable()
+            except Exception: pass
+        for t in mirror_tasks + [c2p, p2c]:
+            if not t.done(): t.cancel()
+        for t in mirror_tasks + [c2p, p2c]:
+            try: await t
+            except Exception: pass
+        logging.info("[%s] closed", conn_id)
+
+async def run_server(cfg: Config):
+    server = await asyncio.start_server(
+        lambda r, w: handle_client(r, w, cfg),
+        host=cfg.listen_host,
+        port=cfg.listen_port,
+        start_serving=True,
+    )
+    sockets = ", ".join(str(s.getsockname()) for s in (server.sockets or []))
+    logging.info("Listening on %s | primary=%s:%d | backups=%s | mirror_buffer=%d",
+                 sockets, cfg.primary.host, cfg.primary.port,
+                 ",".join(f"{b.host}:{b.port}" for b in cfg.backups) or "none",
+                 cfg.mirror_buffer_bytes)
+
+    stop_event = asyncio.Event()
+
+    def _signal_stop():
+        logging.info("Shutdown requested…")
+        stop_event.set()
+
+    loop = asyncio.get_running_loop()
+    for sig in (signal.SIGINT, signal.SIGTERM):
+        try:
+            loop.add_signal_handler(sig, _signal_stop)
+        except NotImplementedError:
+            pass  # Windows quirk
+
+    # Make TASKS (not bare coroutines)
+    stop_task = asyncio.create_task(stop_event.wait())
+    duration_task = (asyncio.create_task(asyncio.sleep(cfg.run_duration))
+                     if cfg.run_duration and cfg.run_duration > 0 else None)
+
+    async with server:
+        tasks = [stop_task] + ([duration_task] if duration_task else [])
+        done, pending = await asyncio.wait(tasks, return_when=asyncio.FIRST_COMPLETED)
+
+        # Cancel whatever is left
+        for t in pending:
+            t.cancel()
+        await asyncio.gather(*pending, return_exceptions=True)
+
+        server.close()
+        await server.wait_closed()
+
+    logging.info("Server stopped.")
+
+def main():
+    ap = argparse.ArgumentParser(description="Asyncio TCP splitter with mirrored backups (config-driven).")
+    ap.add_argument("--config", help="Path to JSON config file.")
+    ap.add_argument("--title", help="Console window title (Windows).")
+    args = ap.parse_args()
+
+    cfg_path = Path(args.config) if args.config else resolve_default_config_path()
+    cfg = load_config(cfg_path)
+    logging.basicConfig(level=cfg.log_level, format="%(asctime)s %(levelname)s %(message)s")
+    logging.info("Using config: %s", cfg_path)
+
+    set_console_title(args.title)
+    try:
+        asyncio.run(run_server(cfg))
+    except KeyboardInterrupt:
+        pass
+
+if __name__ == "__main__":
+    main()
diff --git a/worker.exe b/worker.exe
new file mode 100644
index 0000000..f36079f
Binary files /dev/null and b/worker.exe differ
diff --git a/worker.py b/worker.py
index 37e69a9..a35dbf6 100644
--- a/worker.py
+++ b/worker.py
@@ -1,162 +1,56 @@
-import socket
-import threading
-import json
+#!/usr/bin/env python3
+# worker.py
+import subprocess
 import time
-import logging
-from datetime import datetime
-from crccheck.crc import CrcArc
+import sys
+from pathlib import Path
 
-# Load configuration from config.json
-with open('config.json', 'r') as config_file:
-    config = json.load(config_file)
+TITLE = "TCP_SPLITTER"
+SPLITTER_EXE_NAME = "tcp_splitter.exe"
+CONFIG_NAME = "config.json"
 
-# Configuration from config.json
-LISTEN_HOST = config['listen_host']
-LISTEN_PORT = config['listen_port']
-TARGET_HOSTS = config['target_hosts']
-RUN_DURATION = config['run_duration']
-LOG_LEVEL = config['log_level']
+# Windows creation flag: create child in a new console window
+CREATE_NEW_CONSOLE = 0x00000010
 
-# Map log level strings to logging module constants
-log_level_mapping = {
-    "DEBUG": logging.DEBUG,
-    "INFO": logging.INFO,
-    "WARNING": logging.WARNING,
-    "ERROR": logging.ERROR,
-    "CRITICAL": logging.CRITICAL
-}
+def base_dir() -> Path:
+    # When frozen by PyInstaller, sys.executable is the EXE path
+    return Path(sys.executable).parent if getattr(sys, "frozen", False) else Path(__file__).resolve().parent
 
-# Validate and set the log level
-if LOG_LEVEL not in log_level_mapping:
-    raise ValueError(f"Invalid log level: {LOG_LEVEL}. Valid options are: {list(log_level_mapping.keys())}")
+def launch() -> subprocess.Popen:
+    base = base_dir()
+    splitter = base / SPLITTER_EXE_NAME
+    cfg = base / CONFIG_NAME
 
-# Logging configuration
-logging.basicConfig(
-    level=log_level_mapping[LOG_LEVEL],
-    format='%(asctime)s - %(levelname)s - %(message)s',
-    handlers=[
-        logging.FileHandler('relay_server.log', encoding='utf-8'),  # Log to a file
-        logging.StreamHandler()  # Log to the console
-    ]
-)
-logger = logging.getLogger(__name__)
+    if not splitter.exists():
+        raise FileNotFoundError(f"Cannot find {splitter}")
+    if not cfg.exists():
+        raise FileNotFoundError(f"Cannot find {cfg}")
 
-def relay_to_server(server_host, server_port, data):
-    """Relay data to a server and return the response."""
-    try:
-        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as server_socket:
-            server_socket.connect((server_host, server_port))
-            server_socket.sendall(data)
-            response = server_socket.recv(4096)
-        return response
-    except Exception as e:
-        logger.error(f"Failed to relay data to {server_host}:{server_port}: {e}")
-        return None
+    # Launch tcp_splitter.exe with its own console and a readable title
+    args = [str(splitter), "--config", str(cfg), "--title", TITLE]
+    proc = subprocess.Popen(args, creationflags=CREATE_NEW_CONSOLE)
+    return proc
 
-def calculate_crc(data):
-    """Calculate CRC using CrcArc."""
-    crc = CrcArc.calc(data.encode())  # Encode data to bytes
-    crc_hex = hex(crc).split('x')[1].upper().zfill(4)  # Format as uppercase hex (4 chars)
-    return crc_hex
+def main():
+    while True:
+        start_ts = time.strftime("%Y-%m-%d %H:%M:%S")
+        print(f"[worker] Starting splitter at {start_ts}")
+        try:
+            proc = launch()
+        except Exception as e:
+            print(f"[worker] Launch error: {e}")
+            time.sleep(3)
+            continue
 
-
-def calculate_length(data):
-    """Calculate the length of the data in hexadecimal."""
-    length = len(data.encode())  # Length in bytes
-    length_hex = hex(length)[2:].upper().zfill(4)  # Convert to hex, ensure 4 digits
-    return length_hex
-
-def handle_client(client_socket, client_address):
-    """Handle a client connection."""
-    try:
-        # Receive data from the client
-        data = client_socket.recv(4096)
-        if not data:
-            logger.warning(f"No data received from {client_address}")
-            return
-
-        logger.debug(f"Received data from {client_address}: {data}")
-
-        # Decode the data and check for NULL message
-        plain_data = data.decode("utf-8", errors='ignore')
-        # Validate message integrity
-        if not "SIA-DCS" in plain_data or not "ADM-CID" in plain_data:
-            return
-        if '"NULL"' in plain_data:
-            logger.debug("NULL Message detected, sending ACK without relaying signal!")
-            orig_text = plain_data[15:].strip()
-            ack_text = '"ACK"' + orig_text
-            ack_text_bytes = ack_text.encode()
-            logger.debug(f"ACK Message: {ack_text}")
-
-            # Calculate CRC and format it
-            crc = CrcArc.calc(ack_text_bytes)
-            crcstr = str(hex(crc)).split('x')
-            crcstr = str(crcstr[1].upper())
-            if len(crcstr) == 2:
-                crcstr = '00' + crcstr
-            if len(crcstr) == 3:
-                crcstr = '0' + crcstr
-
-            # Calculate length and format it
-            length = str(hex(len(ack_text_bytes))).split('x')
-            logger.debug(f"CRC & Length: {crcstr}, 00{length[1]}")
-            # Construct the ACK message
-            ack_msg = '\n' + crcstr + '00' + length[1].upper() + ack_text + '\r'
-
-            # Send the ACK response
-            ack_bytes = bytes(ack_msg, 'ASCII')
-            client_socket.sendall(ack_bytes)
-            logger.debug(f"Response sent to client: {ack_msg.strip()}")
-            return
-
-        # Relay the data to all target hosts
-        responses = []
-        for target in TARGET_HOSTS:
-            logger.info(f"Relaying data to {target['host']}:{target['port']}")
-            response = relay_to_server(target['host'], target['port'], data)
-            if response:
-                responses.append(response)
-                logger.debug(f"Received response from {target['host']}:{target['port']}: {response}")
-
-        # Send only the first server's response back to the client
-        if responses:
-            client_socket.sendall(responses[0])
-            logger.info(f"Sent response to {client_address}: {responses[0]}")
-        else:
-            logger.warning(f"No responses received from target hosts for {client_address}")
-
-    except Exception as e:
-        logger.error(f"Error handling client {client_address}: {e}")
-    finally:
-        client_socket.close()
-        logger.debug(f"Closed connection with {client_address}")
-
-def start_relay():
-    """Start the TCP relay server."""
-    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as server_socket:
-        server_socket.bind((LISTEN_HOST, LISTEN_PORT))
-        server_socket.listen(5)
-        logger.info(f"Relay server started listening on {LISTEN_HOST}:{LISTEN_PORT}")
-
-        # Set a timer to stop the server after RUN_DURATION seconds
-        stop_time = time.time() + RUN_DURATION
-        logger.debug(f"Server will run for {RUN_DURATION} seconds.")
-
-        while time.time() < stop_time:
-            try:
-                # Set a timeout to periodically check if the run duration has elapsed
-                server_socket.settimeout(1)
-                client_socket, client_address = server_socket.accept()
-                logger.debug(f"Accepted connection from {client_address}")
-                client_thread = threading.Thread(target=handle_client, args=(client_socket, client_address))
-                client_thread.start()
-            except socket.timeout:
-                continue
-            except Exception as e:
-                logger.error(f"Error accepting connection: {e}")
-
-        logger.info("Server run duration elapsed. Shutting down.")
+        # Poll until it exits; restart on exit
+        while True:
+            rc = proc.poll()
+            if rc is not None:
+                end_ts = time.strftime("%Y-%m-%d %H:%M:%S")
+                print(f"[worker] Splitter exited (code {rc}) at {end_ts}. Restarting…")
+                time.sleep(1)
+                break
+            time.sleep(1)
 
 if __name__ == "__main__":
-    start_relay()
\ No newline at end of file
+    main()