diff --git a/openarm_bringup/scripts/udp_recv_binary.py b/openarm_bringup/scripts/udp_recv_binary.py
new file mode 100755
index 0000000..8fcfcd7
--- /dev/null
+++ b/openarm_bringup/scripts/udp_recv_binary.py
@@ -0,0 +1,116 @@
+#!/usr/bin/env python3
+
+import argparse
+import socket
+import struct
+import sys
+from typing import Dict, List, Tuple
+
+
+MAGIC = b"OAJS"
+VERSION = 1
+
+
+def parse_args() -> argparse.Namespace:
+    parser = argparse.ArgumentParser(
+        description="Receive and decode OpenArm UDP binary joint-state packets (OAJS v1)."
+    )
+    parser.add_argument("--port", type=int, default=10001, help="Listen UDP port")
+    parser.add_argument(
+        "--bind-ip",
+        default="0.0.0.0",
+        help="Bind IP address (default: 0.0.0.0)",
+    )
+    parser.add_argument(
+        "--raw-size",
+        action="store_true",
+        help="Print packet byte size in output",
+    )
+    return parser.parse_args()
+
+
+def decode_packet(data: bytes) -> Dict[str, object]:
+    header_size = struct.calcsize("<4sB H q I")
+    if len(data) < header_size:
+        raise ValueError("packet too short for header")
+
+    magic, version, joint_count, sec, nanosec = struct.unpack_from("<4sB H q I", data, 0)
+
+    if magic != MAGIC:
+        raise ValueError(f"bad magic: {magic!r}")
+    if version != VERSION:
+        raise ValueError(f"unsupported version: {version}")
+
+    offset = header_size
+    joints: List[Tuple[str, float, float, float]] = []
+
+    for _ in range(joint_count):
+        if offset + 1 > len(data):
+            raise ValueError("truncated packet at name length")
+
+        name_len = data[offset]
+        offset += 1
+
+        if offset + name_len > len(data):
+            raise ValueError("truncated packet at name bytes")
+
+        name_bytes = data[offset:offset + name_len]
+        offset += name_len
+
+        if offset + 12 > len(data):
+            raise ValueError("truncated packet at float payload")
+
+        position, velocity, torque = struct.unpack_from("<fff", data, offset)
+        offset += 12
+
+        name = name_bytes.decode("utf-8", errors="replace")
+        joints.append((name, position, velocity, torque))
+
+    return {
+        "version": version,
+        "sec": sec,
+        "nanosec": nanosec,
+        "joints": joints,
+    }
+
+
+def print_packet(packet: Dict[str, object], size: int, show_size: bool) -> None:
+    prefix = f"v{packet['version']} stamp={packet['sec']}.{packet['nanosec']}"
+    if show_size:
+        prefix += f" bytes={size}"
+
+    joints = packet["joints"]
+    print(f"{prefix} joints={len(joints)}")
+    for name, position, velocity, torque in joints:
+        print(f"  {name:28s}  pos={position:>12.6f}  vel={velocity:>12.6f}  tau={torque:>12.6f}")
+
+
+def main() -> int:
+    args = parse_args()
+
+    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    sock.bind((args.bind_ip, args.port))
+
+    print(f"Listening binary UDP on {args.bind_ip}:{args.port}")
+
+    try:
+        while True:
+            data, addr = sock.recvfrom(65535)
+            print(f"\nfrom {addr[0]}:{addr[1]}")
+            try:
+                packet = decode_packet(data)
+            except ValueError as exc:
+                print(f"decode error: {exc}")
+                continue
+
+            print_packet(packet, len(data), args.raw_size)
+    except KeyboardInterrupt:
+        print("\nStopped.")
+    finally:
+        sock.close()
+
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/openarm_bringup/scripts/udp_recv_json.py b/openarm_bringup/scripts/udp_recv_json.py
new file mode 100755
index 0000000..0dde5b9
--- /dev/null
+++ b/openarm_bringup/scripts/udp_recv_json.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python3
+
+import argparse
+import json
+import socket
+import sys
+from typing import Any, Dict
+
+
+def parse_args() -> argparse.Namespace:
+    parser = argparse.ArgumentParser(
+        description="Receive and print OpenArm UDP JSON joint-state packets."
+    )
+    parser.add_argument("--port", type=int, default=10001, help="Listen UDP port")
+    parser.add_argument(
+        "--bind-ip",
+        default="0.0.0.0",
+        help="Bind IP address (default: 0.0.0.0)",
+    )
+    parser.add_argument(
+        "--raw",
+        action="store_true",
+        help="Print raw JSON text instead of formatted joint table",
+    )
+    return parser.parse_args()
+
+
+def print_packet(packet: Dict[str, Any]) -> None:
+    protocol = packet.get("protocol", "unknown")
+    stamp = packet.get("stamp", {})
+    sec = stamp.get("sec", "?")
+    nanosec = stamp.get("nanosec", "?")
+    joints = packet.get("joints", [])
+
+    print(f"protocol={protocol} stamp={sec}.{nanosec} joints={len(joints)}")
+    for joint in joints:
+        name = joint.get("name", "?")
+        pos = joint.get("position", None)
+        vel = joint.get("velocity", None)
+        tor = joint.get("torque", None)
+        print(f"  {name:28s}  pos={pos!s:>12s}  vel={vel!s:>12s}  tau={tor!s:>12s}")
+
+
+def main() -> int:
+    args = parse_args()
+
+    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    sock.bind((args.bind_ip, args.port))
+
+    print(f"Listening JSON UDP on {args.bind_ip}:{args.port}")
+
+    try:
+        while True:
+            data, addr = sock.recvfrom(65535)
+            text = data.decode("utf-8", errors="replace")
+            try:
+                packet = json.loads(text)
+            except json.JSONDecodeError as exc:
+                print(f"[{addr[0]}:{addr[1]}] invalid JSON: {exc}")
+                continue
+
+            print(f"\nfrom {addr[0]}:{addr[1]}")
+            if args.raw:
+                print(text)
+            else:
+                print_packet(packet)
+    except KeyboardInterrupt:
+        print("\nStopped.")
+    finally:
+        sock.close()
+
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())