diff --git a/es24n-conf.py/es24n_conf.py b/es24n-conf.py/es24n_conf.py
new file mode 100644
index 0000000..eba9eba
--- /dev/null
+++ b/es24n-conf.py/es24n_conf.py
@@ -0,0 +1,673 @@
+#!/usr/bin/env python3
+"""
+ES24N IOM Network Configuration Tool
+TrueNAS ES24N Expansion Shelf — Serial Configuration Utility
+Based on ES24N Product Service Guide v.26011
+
+Zero external dependencies — Python 3 standard library only.
+Compatible with TrueNAS (FreeBSD) and Linux.
+"""
+
+import fcntl
+import glob
+import ipaddress
+import json
+import os
+import select
+import ssl
+import subprocess
+import sys
+import termios
+import time
+import tty
+import urllib.error
+import urllib.request
+from base64 import b64encode
+from dataclasses import dataclass, field
+from typing import Optional
+
+# ── ANSI colour helpers ───────────────────────────────────────────────────────
+class C:
+    RED   = "\033[0;31m"
+    GRN   = "\033[0;32m"
+    YEL   = "\033[1;33m"
+    CYN   = "\033[0;36m"
+    WHT   = "\033[1;37m"
+    DIM   = "\033[2m"
+    BOLD  = "\033[1m"
+    RESET = "\033[0m"
+    CLEAR = "\033[2J\033[H"
+
+def _c(colour: str, text: str) -> str:
+    return f"{colour}{text}{C.RESET}"
+
+def info(msg: str):  print(f"  {_c(C.CYN,  'i')}  {msg}")
+def ok(msg: str):    print(f"  {_c(C.GRN,  'OK')} {msg}")
+def warn(msg: str):  print(f"  {_c(C.YEL,  '!')}  {msg}")
+def error(msg: str): print(f"  {_c(C.RED,  'X')}  {msg}")
+
+def banner():
+    print(C.CLEAR, end="")
+    w = 60
+    print(_c(C.CYN, "  +" + "-" * w + "+"))
+    print(_c(C.CYN, "  |") + _c(C.WHT + C.BOLD,
+          "      TrueNAS ES24N IOM Configuration Tool          ") + _c(C.CYN, "  |"))
+    print(_c(C.CYN, "  |") + _c(C.DIM,
+          "      Serial Network Setup  v2.0  (stdlib only)     ") + _c(C.CYN, "  |"))
+    print(_c(C.CYN, "  +" + "-" * w + "+"))
+    print()
+
+def rule(title: str = ""):
+    width = 60
+    if title:
+        pad   = max(0, width - len(title) - 2)
+        left  = pad // 2
+        right = pad - left
+        line  = f"{'-' * left} {title} {'-' * right}"
+    else:
+        line = "-" * width
+    print(f"\n  {_c(C.YEL, line)}\n")
+
+def draw_table(headers: list, rows: list, col_widths: list):
+    sep = "  +-" + "-+-".join("-" * w for w in col_widths) + "-+"
+
+    def fmt_row(cells):
+        return "  | " + " | ".join(
+            str(c).ljust(w) for c, w in zip(cells, col_widths)
+        ) + " |"
+
+    print(_c(C.DIM, sep))
+    print(_c(C.BOLD, fmt_row(headers)))
+    print(_c(C.DIM, sep))
+    for row in rows:
+        print(fmt_row(row))
+    print(_c(C.DIM, sep))
+
+def draw_box(lines: list, colour: str = C.CYN):
+    width = max(len(l) for l in lines) + 4
+    print(f"  {_c(colour, '+' + '-' * width + '+')}")
+    for line in lines:
+        pad = width - len(line) - 2
+        print(f"  {_c(colour, '|')}  {line}{' ' * pad}  {_c(colour, '|')}")
+    print(f"  {_c(colour, '+' + '-' * width + '+')}")
+
+
+# ── Input helpers ─────────────────────────────────────────────────────────────
+def prompt(label: str, default: str = "", password: bool = False) -> str:
+    display = f"  {_c(C.CYN, label)}"
+    if default:
+        display += f" {_c(C.DIM, f'[{default}]')}"
+    display += ": "
+
+    if password:
+        fd  = sys.stdin.fileno()
+        old = termios.tcgetattr(fd)
+        try:
+            tty.setraw(fd)
+            sys.stdout.write(display)
+            sys.stdout.flush()
+            chars = []
+            while True:
+                ch = sys.stdin.read(1)
+                if ch in ("\r", "\n"):
+                    break
+                elif ch in ("\x7f", "\x08"):
+                    if chars:
+                        chars.pop()
+                        sys.stdout.write("\b \b")
+                        sys.stdout.flush()
+                elif ch == "\x03":
+                    raise KeyboardInterrupt
+                else:
+                    chars.append(ch)
+                    sys.stdout.write("*")
+                    sys.stdout.flush()
+            print()
+            return "".join(chars)
+        finally:
+            termios.tcsetattr(fd, termios.TCSADRAIN, old)
+    else:
+        sys.stdout.write(display)
+        sys.stdout.flush()
+        val = sys.stdin.readline().strip()
+        return val if val else default
+
+
+def prompt_ip(label: str) -> str:
+    while True:
+        val = prompt(label)
+        try:
+            ipaddress.IPv4Address(val)
+            return val
+        except ValueError:
+            warn(f"'{val}' is not a valid IPv4 address — please try again.")
+
+
+def prompt_yn(label: str, default: bool = True) -> bool:
+    hint = "Y/n" if default else "y/N"
+    val  = prompt(f"{label} [{hint}]").strip().lower()
+    if not val:
+        return default
+    return val in ("y", "yes")
+
+
+def prompt_password() -> str:
+    while True:
+        val = prompt(
+            "Admin password (BMC/chassis serial, e.g. MXE3000043CHA007)",
+            password=True,
+        )
+        if val:
+            return val
+        warn("Password cannot be empty.")
+
+
+# ── Data classes ──────────────────────────────────────────────────────────────
+@dataclass
+class IOMConfig:
+    iom:     str
+    dhcp:    bool = True
+    ip:      str  = ""
+    gateway: str  = ""
+    netmask: str  = ""
+
+@dataclass
+class ShelfConfig:
+    device:   str = ""
+    password: str = ""
+    iom1: IOMConfig = field(default_factory=lambda: IOMConfig("IOM1"))
+    iom2: IOMConfig = field(default_factory=lambda: IOMConfig("IOM2"))
+
+
+# ── Serial port (stdlib: termios / fcntl / select) ────────────────────────────
+class SerialPort:
+    """
+    Minimal 8N1 serial port using only the Python standard library.
+    Replaces pyserial for TrueNAS environments where pip is unavailable.
+    """
+
+    BAUD_MAP = {
+        9600:   termios.B9600,
+        19200:  termios.B19200,
+        38400:  termios.B38400,
+        57600:  termios.B57600,
+        115200: termios.B115200,
+    }
+
+    def __init__(self, port: str, baudrate: int = 115200, timeout: float = 5.0):
+        self.port     = port
+        self.baudrate = baudrate
+        self.timeout  = timeout
+        self._fd: Optional[int] = None
+        self._saved_attrs       = None
+
+    # ── Open / close ──────────────────────────────────────────────────────────
+    def open(self):
+        try:
+            self._fd = os.open(self.port, os.O_RDWR | os.O_NOCTTY | os.O_NONBLOCK)
+        except OSError as e:
+            raise OSError(f"Cannot open {self.port}: {e}") from e
+
+        # Switch back to blocking mode now that O_NOCTTY is set
+        flags = fcntl.fcntl(self._fd, fcntl.F_GETFL)
+        fcntl.fcntl(self._fd, fcntl.F_SETFL, flags & ~os.O_NONBLOCK)
+
+        self._saved_attrs = termios.tcgetattr(self._fd)
+
+        # Raw 8N1: iflag, oflag, cflag, lflag, ispeed, ospeed, cc
+        attrs = list(termios.tcgetattr(self._fd))
+        baud  = self.BAUD_MAP.get(self.baudrate, termios.B115200)
+
+        attrs[0] = termios.IGNBRK                          # iflag
+        attrs[1] = 0                                        # oflag
+        attrs[2] = termios.CS8 | termios.CREAD | termios.CLOCAL  # cflag
+        attrs[3] = 0                                        # lflag (raw)
+        attrs[4] = baud                                     # ispeed
+        attrs[5] = baud                                     # ospeed
+        attrs[6][termios.VMIN]  = 0
+        attrs[6][termios.VTIME] = min(int(self.timeout * 10), 255)
+
+        termios.tcsetattr(self._fd, termios.TCSANOW, attrs)
+        termios.tcflush(self._fd, termios.TCIOFLUSH)
+
+    def close(self):
+        if self._fd is not None:
+            try:
+                if self._saved_attrs:
+                    termios.tcsetattr(self._fd, termios.TCSADRAIN, self._saved_attrs)
+                os.close(self._fd)
+            except OSError:
+                pass
+            finally:
+                self._fd = None
+
+    @property
+    def is_open(self) -> bool:
+        return self._fd is not None
+
+    # ── Read / write ──────────────────────────────────────────────────────────
+    def write(self, data: bytes):
+        if self._fd is None:
+            raise OSError("Port is not open")
+        os.write(self._fd, data)
+
+    def read_chunk(self, size: int = 4096) -> bytes:
+        if self._fd is None:
+            raise OSError("Port is not open")
+        try:
+            return os.read(self._fd, size)
+        except OSError:
+            return b""
+
+    def read_until_quiet(self, quiet_period: float = 0.5) -> str:
+        """
+        Read until no new bytes arrive for `quiet_period` seconds,
+        or until `self.timeout` total seconds have elapsed.
+        """
+        output   = b""
+        deadline = time.monotonic() + self.timeout
+        last_rx  = time.monotonic()
+
+        while True:
+            now = time.monotonic()
+            if now >= deadline:
+                break
+            if output and (now - last_rx) >= quiet_period:
+                break
+
+            wait = min(deadline - now, quiet_period)
+            ready, _, _ = select.select([self._fd], [], [], wait)
+            if ready:
+                chunk = self.read_chunk()
+                if chunk:
+                    output  += chunk
+                    last_rx  = time.monotonic()
+
+        return output.decode("utf-8", errors="replace")
+
+    def send_line(self, cmd: str = "", delay: float = 0.3):
+        self.write((cmd + "\r\n").encode("utf-8"))
+        time.sleep(delay)
+
+    # ── Context manager ───────────────────────────────────────────────────────
+    def __enter__(self):
+        self.open()
+        return self
+
+    def __exit__(self, *_):
+        self.close()
+
+
+# ── Step 1: Detect serial device ──────────────────────────────────────────────
+def detect_serial_device() -> Optional[str]:
+    rule("Step 1 of 6 -- Serial Cable & Device Detection")
+
+    print("  Connect the serial cable from the ES24N IOM1 port")
+    print("  to the active F-Series controller USB port.")
+    print()
+    prompt("Press Enter when the cable is connected")
+
+    for attempt in range(1, 4):
+        info(f"Scanning for USB serial devices (attempt {attempt}/3)...")
+        time.sleep(1)
+
+        # FreeBSD: /dev/ttyU*   Linux: /dev/ttyUSB*, /dev/ttyACM*
+        patterns = ["/dev/ttyUSB*", "/dev/ttyACM*", "/dev/ttyU*"]
+        ports    = sorted({p for pat in patterns for p in glob.glob(pat)})
+
+        if ports:
+            break
+
+        if attempt < 3:
+            warn("No device found yet — retrying in 2 seconds...")
+            time.sleep(2)
+
+    if not ports:
+        error("No USB serial device detected after 3 attempts.")
+        print()
+        print("  Troubleshooting:")
+        print("    - Ensure the serial cable is fully seated at both ends.")
+        print("    - Try a different USB port on the controller.")
+        print("    - Confirm the ES24N is powered on.")
+        return None
+
+    if len(ports) == 1:
+        ok(f"Device found: {_c(C.BOLD, ports[0])}")
+        _fix_permissions(ports[0])
+        return ports[0]
+
+    # Multiple devices — let the user choose
+    print()
+    draw_table(
+        ["#", "Device"],
+        [[str(i), p] for i, p in enumerate(ports, 1)],
+        [4, 24],
+    )
+    print()
+
+    while True:
+        val = prompt(f"Select device number [1-{len(ports)}]")
+        if val.isdigit() and 1 <= int(val) <= len(ports):
+            selected = ports[int(val) - 1]
+            ok(f"Selected: {_c(C.BOLD, selected)}")
+            _fix_permissions(selected)
+            return selected
+        warn(f"Please enter a number between 1 and {len(ports)}.")
+
+
+def _fix_permissions(device: str):
+    try:
+        result = subprocess.run(
+            ["sudo", "chown", ":wheel", device],
+            capture_output=True, timeout=5,
+        )
+        if result.returncode == 0:
+            ok(f"Permissions updated on {device}")
+            return
+    except Exception:
+        pass
+    try:
+        os.chmod(device, 0o666)
+        ok(f"Permissions updated on {device}")
+    except PermissionError:
+        warn("Could not update device permissions automatically.")
+        warn("If the connection fails, re-run this script with sudo.")
+
+
+# ── Step 2: Open serial connection & wake IOM console ─────────────────────────
+def open_serial_connection(device: str) -> Optional[SerialPort]:
+    rule("Step 2 of 6 -- Opening Serial Connection")
+
+    info(f"Opening {device} at 115200 baud (8N1)...")
+    ser = SerialPort(device, baudrate=115200, timeout=5.0)
+
+    try:
+        ser.open()
+    except OSError as e:
+        error(str(e))
+        return None
+
+    ok(f"Port opened: {device}")
+    info("Sending wake signal to IOM console...")
+
+    ser.send_line("", delay=0.5)
+    ser.send_line("", delay=0.5)
+    response = ser.read_until_quiet(quiet_period=0.5)
+
+    print()
+    if response.strip():
+        print(f"  {_c(C.DIM, '+-- IOM Console Response ' + '-' * 31)}")
+        for line in response.strip().splitlines():
+            print(f"  {_c(C.DIM, '|')}  {line}")
+        print(f"  {_c(C.DIM, '+' + '-' * 56)}")
+        print()
+
+        low = response.lower()
+        if any(kw in low for kw in ("login", "$", "#", "password")):
+            ok("IOM console is responsive.")
+        else:
+            warn("Unexpected response — the IOM may still be booting.")
+            warn("You can continue; the Redfish API operates independently.")
+    else:
+        warn("No response received from IOM console.")
+        warn("The Redfish API may still be reachable. Continuing...")
+
+    print()
+    return ser
+
+
+# ── Step 3: Collect network configuration ─────────────────────────────────────
+def collect_network_config(cfg: ShelfConfig):
+    rule("Step 3 of 6 -- IOM Network Configuration")
+
+    print("  How should the IOMs be configured?")
+    print(f"    {_c(C.BOLD, '1')}  Static IP addresses")
+    print(f"    {_c(C.BOLD, '2')}  DHCP")
+    print()
+
+    while True:
+        choice = prompt("Select option [1/2]")
+        if choice in ("1", "2"):
+            break
+        warn("Please enter 1 or 2.")
+
+    use_dhcp = (choice == "2")
+    print()
+
+    cfg.password = prompt_password()
+
+    if use_dhcp:
+        cfg.iom1 = IOMConfig("IOM1", dhcp=True)
+        cfg.iom2 = IOMConfig("IOM2", dhcp=True)
+        print()
+        ok("Both IOMs will be set to DHCP.")
+        return
+
+    # Static — IOM1
+    print()
+    info(f"Static network details for {_c(C.BOLD, 'IOM1')}:")
+    iom1_ip = prompt_ip("  IOM1 IP address ")
+    iom1_gw = prompt_ip("  IOM1 Gateway    ")
+    iom1_nm = prompt_ip("  IOM1 Subnet Mask")
+    cfg.iom1 = IOMConfig("IOM1", dhcp=False, ip=iom1_ip, gateway=iom1_gw, netmask=iom1_nm)
+
+    # Static — IOM2
+    print()
+    info(f"Static network details for {_c(C.BOLD, 'IOM2')}:")
+    iom2_ip = prompt_ip("  IOM2 IP address ")
+
+    same = prompt_yn("  Same gateway and subnet mask as IOM1?", default=True)
+    if same:
+        iom2_gw, iom2_nm = iom1_gw, iom1_nm
+    else:
+        iom2_gw = prompt_ip("  IOM2 Gateway    ")
+        iom2_nm = prompt_ip("  IOM2 Subnet Mask")
+
+    cfg.iom2 = IOMConfig("IOM2", dhcp=False, ip=iom2_ip, gateway=iom2_gw, netmask=iom2_nm)
+
+
+# ── Step 4: Apply configuration via Redfish ───────────────────────────────────
+def apply_configuration(cfg: ShelfConfig) -> bool:
+    rule("Step 4 of 6 -- Applying Configuration via Redfish API")
+
+    info("Sending Redfish PATCH requests over serial loopback (127.0.0.1)...")
+    print()
+
+    results  = []
+    all_ok   = True
+    for iom_cfg in [cfg.iom1, cfg.iom2]:
+        success, message = _patch_iom(cfg.password, iom_cfg)
+        results.append([iom_cfg.iom,
+                         f"{_c(C.GRN, 'OK')}" if success else f"{_c(C.RED, 'FAIL')}",
+                         message])
+        if not success:
+            all_ok = False
+
+    draw_table(["IOM", "Result", "Detail"], results, [6, 8, 44])
+    print()
+    return all_ok
+
+
+def _patch_iom(password: str, iom: IOMConfig) -> tuple:
+    url = f"https://127.0.0.1/redfish/v1/Managers/{iom.iom}/EthernetInterfaces/1"
+
+    if iom.dhcp:
+        payload = {"DHCPv4": {"DHCPEnabled": True}}
+    else:
+        payload = {
+            "DHCPv4": {"DHCPEnabled": False},
+            "IPv4StaticAddresses": [{
+                "Address":    iom.ip,
+                "Gateway":    iom.gateway,
+                "SubnetMask": iom.netmask,
+            }],
+        }
+
+    data        = json.dumps(payload).encode("utf-8")
+    credentials = b64encode(f"Admin:{password}".encode()).decode()
+    ctx         = ssl.create_default_context()
+    ctx.check_hostname = False
+    ctx.verify_mode    = ssl.CERT_NONE
+
+    req = urllib.request.Request(
+        url,
+        data=data,
+        method="PATCH",
+        headers={
+            "Content-Type":  "application/json",
+            "Authorization": f"Basic {credentials}",
+        },
+    )
+
+    try:
+        with urllib.request.urlopen(req, context=ctx, timeout=10) as resp:
+            if resp.status in (200, 204):
+                mode = "DHCP" if iom.dhcp else f"static {iom.ip}"
+                return True, f"Configured: {mode}"
+            body = resp.read().decode("utf-8", errors="replace")
+            return False, f"HTTP {resp.status}: {body[:80]}"
+
+    except urllib.error.HTTPError as e:
+        body = e.read().decode("utf-8", errors="replace")
+        try:
+            msg = json.loads(body).get("error", {}).get("message", body)
+        except json.JSONDecodeError:
+            msg = body
+        return False, f"HTTP {e.code}: {msg[:80]}"
+
+    except OSError as e:
+        return False, f"Connection error: {e}"
+
+
+# ── Step 5: Print configuration summary ───────────────────────────────────────
+def print_summary(cfg: ShelfConfig):
+    rule("Step 5 of 6 -- Configuration Summary")
+
+    def val(iom: IOMConfig, field: str) -> str:
+        dhcp_map = {"mode": "DHCP", "ip": "-- (DHCP)", "gateway": "-- (DHCP)", "netmask": "-- (DHCP)"}
+        stat_map = {"mode": "Static", "ip": iom.ip, "gateway": iom.gateway, "netmask": iom.netmask}
+        return (dhcp_map if iom.dhcp else stat_map).get(field, "")
+
+    draw_table(
+        ["Setting",      "IOM1",                    "IOM2"],
+        [
+            ["Mode",        val(cfg.iom1, "mode"),    val(cfg.iom2, "mode")],
+            ["IP Address",  val(cfg.iom1, "ip"),      val(cfg.iom2, "ip")],
+            ["Gateway",     val(cfg.iom1, "gateway"), val(cfg.iom2, "gateway")],
+            ["Subnet Mask", val(cfg.iom1, "netmask"), val(cfg.iom2, "netmask")],
+            ["Serial Port", cfg.device,               cfg.device],
+        ],
+        [12, 22, 22],
+    )
+
+    print()
+    draw_box([
+        f"{_c(C.YEL, 'IMPORTANT -- Per the ES24N Service Guide:')}",
+        "",
+        "Remove the serial cable ONLY after verifying each",
+        "expander appears in TrueNAS with matching drives.",
+        "",
+        "TrueNAS > System Settings > Enclosure >",
+        "NVMe-oF Expansion Shelves",
+    ], colour=C.YEL)
+    print()
+
+
+# ── Step 6: Close serial connection ───────────────────────────────────────────
+def close_serial_connection(ser: SerialPort, device: str):
+    rule("Step 6 of 6 -- Close Serial Connection")
+
+    if ser and ser.is_open:
+        ser.close()
+        ok(f"Serial port {device} closed.")
+
+    print()
+    prompt("Disconnect the serial cable, then press Enter to continue")
+    ok("Serial cable disconnected. Shelf configuration complete.")
+
+
+# ── Full shelf configuration cycle ────────────────────────────────────────────
+def configure_shelf() -> bool:
+    """Run one complete shelf cycle. Returns True if user wants another."""
+    banner()
+    cfg = ShelfConfig()
+
+    # 1 — Detect device
+    device = detect_serial_device()
+    if not device:
+        error("Could not detect a serial device. Returning to main menu.")
+        time.sleep(2)
+        return True
+    cfg.device = device
+
+    # 2 — Open serial port
+    ser = open_serial_connection(device)
+    if not ser:
+        error("Could not open serial port. Returning to main menu.")
+        time.sleep(2)
+        return True
+
+    # 3 — Collect settings
+    collect_network_config(cfg)
+
+    # 4 — Confirm & apply
+    print()
+    rule("Ready to Apply")
+    info("Redfish PATCH requests will be sent to each IOM via 127.0.0.1")
+    info("using the active serial session as the communication path.")
+    print()
+
+    if prompt_yn("Apply configuration now?", default=True):
+        apply_configuration(cfg)
+    else:
+        warn("Configuration skipped — no changes were made.")
+
+    # 5 — Summary & reminder
+    print_summary(cfg)
+
+    # 6 — Close serial port
+    close_serial_connection(ser, device)
+
+    print()
+    return prompt_yn("Configure another ES24N shelf?", default=False)
+
+
+# ── Entry point ───────────────────────────────────────────────────────────────
+def main():
+    banner()
+    print(f"  {_c(C.DIM, 'Automates ES24N IOM network configuration over a direct serial')}")
+    print(f"  {_c(C.DIM, 'connection using the Redfish API (loopback).')}")
+    print(f"  {_c(C.DIM, 'No external dependencies -- Python 3 standard library only.')}")
+    print()
+
+    while True:
+        banner()
+        draw_box([
+            f"  {_c(C.BOLD, '1')}  Configure a new ES24N shelf",
+            f"  {_c(C.BOLD, '2')}  Exit",
+        ])
+        print()
+
+        choice = prompt("Select [1/2]")
+        if choice == "1":
+            another = configure_shelf()
+            if not another:
+                break
+        elif choice == "2":
+            break
+        else:
+            warn("Please enter 1 or 2.")
+            time.sleep(1)
+
+    print()
+    ok("Exiting ES24N IOM Configuration Tool. Goodbye.")
+    print()
+
+
+if __name__ == "__main__":
+    try:
+        main()
+    except KeyboardInterrupt:
+        print()
+        warn("Interrupted. Exiting.")
+        sys.exit(0)