diff --git a/cocoscreator_projects/YouleNexus/assets/framework/net/net-client.ts b/cocoscreator_projects/YouleNexus/assets/framework/net/net-client.ts
new file mode 100644
index 0000000..8187073
--- /dev/null
+++ b/cocoscreator_projects/YouleNexus/assets/framework/net/net-client.ts
@@ -0,0 +1,149 @@
+import { EventBus } from '../core/events.ts';
+import { Route, RECV_TIMEOUT_MS, RECONNECT_INTERVAL_MS, LOGIN_GUARD_MS, SERVER_ROTATE_EVERY } from '../core/constants.ts';
+import type { Transport } from './transport.ts';
+import { encodeOutbound, decodeFrame } from './envelope-codec.ts';
+import { HeartbeatWatchdog, realClock, type Clock } from './heartbeat.ts';
+import { ReconnectPolicy } from './reconnect.ts';
+import type { InboundMessage } from '../core/types/envelope.ts';
+import type { LoginRequestData } from '../core/types/login.ts';
+
+export interface NetClientEvents extends Record<string, any[]> {
+  open: [];
+  login: [unknown];        // player_login 响应 data
+  message: [InboundMessage];
+  slow: [];
+  reconnecting: [string];  // 目标 server
+  serverSwitch: [string];  // 新 server 地址
+  kicked: [unknown];
+  close: [];
+}
+
+export interface NetClientOptions {
+  servers: string | string[];
+  transportFactory: () => Transport;
+  clock?: Clock;
+  bus?: EventBus<NetClientEvents>;
+}
+
+/** 网络客户端：编排 transport/codec/heartbeat/reconnect，事件驱动，忠实 docs/protocol/01。 */
+export class NetClient {
+  readonly bus: EventBus<NetClientEvents>;
+  private transportFactory: () => Transport;
+  private clock: Clock;
+  private policy: ReconnectPolicy;
+  private watchdog: HeartbeatWatchdog;
+
+  private transport: Transport | null = null;
+  private tcpId = 0;             // 每次连接自增；onMessage 闭包捕获本次 id 做去重
+  private identity: LoginRequestData | null = null;
+  private isSendLoginState = false;
+  private isLogin = false;
+  private loginGuard: unknown = null;
+  private reconnectTimer: unknown = null;
+  private stopped = false;
+
+  constructor(opts: NetClientOptions) {
+    this.bus = opts.bus ?? new EventBus<NetClientEvents>();
+    this.transportFactory = opts.transportFactory;
+    this.clock = opts.clock ?? realClock;
+    this.policy = new ReconnectPolicy(opts.servers, SERVER_ROTATE_EVERY);
+    this.watchdog = new HeartbeatWatchdog(RECV_TIMEOUT_MS, () => this.onRecvTimeout(), this.clock);
+  }
+
+  setIdentity(identity: LoginRequestData): void { this.identity = identity; }
+  on = <K extends keyof NetClientEvents & string>(t: K, fn: (...a: NetClientEvents[K]) => void) => this.bus.on(t, fn);
+  off = <K extends keyof NetClientEvents & string>(t: K, fn: (...a: NetClientEvents[K]) => void) => this.bus.off(t, fn);
+
+  start(): void { this.stopped = false; this.connect(this.policy.current()); }
+
+  stop(): void {
+    this.stopped = true;
+    this.watchdog.stop();
+    if (this.reconnectTimer != null) { this.clock.clearTimeout(this.reconnectTimer); this.reconnectTimer = null; }
+    if (this.loginGuard != null) { this.clock.clearTimeout(this.loginGuard); this.loginGuard = null; }
+    this.transport?.close();
+  }
+
+  /** 发业务包（单层信封）。 */
+  send(route: string, rpc: string, data: unknown): void {
+    this.transport?.send(encodeOutbound(route, rpc, data));
+  }
+
+  private connect(url: string): void {
+    const id = ++this.tcpId;
+    const t = this.transportFactory();
+    this.transport = t;
+    t.onOpen(() => { if (id === this.tcpId) this.onOpen(); });
+    t.onMessage((frame) => { if (id === this.tcpId) this.onMessage(frame); });
+    t.onClose(() => { if (id === this.tcpId) this.onClose(); });
+    t.connect(url);
+  }
+
+  private onOpen(): void {
+    this.bus.emit('open');
+    this.sendLogin();
+  }
+
+  private sendLogin(): void {
+    if (!this.identity) return;          // 无身份不发（docs §6.1：首登需身份）
+    this.isSendLoginState = true;
+    this.transport?.send(encodeOutbound(Route.agent, 'player_login', this.identity));
+    if (this.loginGuard != null) this.clock.clearTimeout(this.loginGuard);
+    this.loginGuard = this.clock.setTimeout(() => { this.loginGuard = null; this.onLoginGuardTimeout(); }, LOGIN_GUARD_MS); // docs §6.2
+  }
+
+  private onMessage(frame: string): void {
+    const r = decodeFrame(frame);
+    if (r.kind === 'ignore') return;
+    this.watchdog.feed();                                 // 收任意有效帧重置看门狗 docs §4.1
+    if (r.kind === 'handshake' || r.kind === 'heartbeat') return; // 忽略，心跳不回包
+    if (r.kind === 'serverDown') { this.sendLogin(); return; }    // docs §4.2（剥离 UI 判定，直接重发登录）
+
+    const msg = r.message;
+    if (msg.rpc === 'submit_error') return;               // docs §3.2-9
+    if (this.isSendLoginState) {                          // docs §3.2-10 登录态门控
+      if (msg.rpc === 'player_login') {
+        this.isSendLoginState = false; this.isLogin = true;
+        if (this.loginGuard != null) { this.clock.clearTimeout(this.loginGuard); this.loginGuard = null; }
+        this.policy.reset();
+        this.bus.emit('login', msg.data);
+      } else if (msg.rpc === 'kick_server') {
+        this.bus.emit('kicked', msg.data);
+      }
+      return; // 其它一律丢弃
+    }
+    // 服务器切换指令 docs §7.4
+    if (msg.rpc === 'connect_roomserver' && (msg.data as any)?.roomserver) {
+      this.switchServer((msg.data as any).roomserver); return;
+    }
+    if (msg.rpc === 'connect_agentserver' && (msg.data as any)?.agentserver) {
+      this.switchServer((msg.data as any).agentserver); return;
+    }
+    this.bus.emit('message', msg);
+  }
+
+  private switchServer(addr: string): void {
+    this.policy.setCurrent(addr);
+    this.bus.emit('serverSwitch', addr);
+    this.reconnectNow();                                  // 关闭当前→重连到新地址→重登
+  }
+
+  private onRecvTimeout(): void { this.bus.emit('slow'); this.reconnectNow(); }   // docs §4.1
+  private onLoginGuardTimeout(): void { this.reconnectNow(); }                    // docs §6.2
+
+  private onClose(): void {
+    this.watchdog.stop();
+    if (this.stopped) return;
+    const next = this.policy.onFailure();
+    this.bus.emit('reconnecting', next);
+    if (this.reconnectTimer != null) this.clock.clearTimeout(this.reconnectTimer);
+    this.reconnectTimer = this.clock.setTimeout(() => { this.reconnectTimer = null; this.connect(next); }, RECONNECT_INTERVAL_MS); // docs §7.2 间隔 10s
+  }
+
+  /** 主动关闭当前连接，交由 onClose 走重连。 */
+  private reconnectNow(): void {
+    this.isSendLoginState = false;
+    if (this.loginGuard != null) { this.clock.clearTimeout(this.loginGuard); this.loginGuard = null; }
+    this.transport?.close();
+  }
+}
diff --git a/cocoscreator_projects/framework-tests/net/net-client.test.ts b/cocoscreator_projects/framework-tests/net/net-client.test.ts
new file mode 100644
index 0000000..ef68e0b
--- /dev/null
+++ b/cocoscreator_projects/framework-tests/net/net-client.test.ts
@@ -0,0 +1,125 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { NetClient } from '../../YouleNexus/assets/framework/net/net-client.ts';
+import { FakeTransport } from '../helpers/fake-transport.ts';
+import type { Clock } from '../../YouleNexus/assets/framework/net/heartbeat.ts';
+
+function fakeClock() {
+  let seq = 0, now = 0;
+  const timers = new Map<number, { fn: () => void; at: number }>();
+  const clock: Clock = {
+    setTimeout: (fn, ms) => { const id = ++seq; timers.set(id, { fn, at: now + ms }); return id; },
+    clearTimeout: (id: any) => { timers.delete(id); },
+  };
+  const advance = (ms: number) => { now += ms; for (const [id, t] of [...timers]) if (t.at <= now) { timers.delete(id); t.fn(); } };
+  return { clock, advance };
+}
+
+const IDENTITY = { agentid: 1, gameid: 2, openid: 'o', nickname: 'n', avatar: 'a', sex: 0, province: '', city: '', unionid: 'u', version: '1', channelid: 0, marketid: 0 };
+
+function makeClient(transports: FakeTransport[], clock: Clock) {
+  let i = 0;
+  const client = new NetClient({
+    servers: 'ws://a',
+    transportFactory: () => transports[i++] ?? transports[transports.length - 1],
+    clock,
+  });
+  client.setIdentity(IDENTITY);
+  return client;
+}
+
+test('onOpen 后自动发 player_login（单层信封）', async () => {
+  const t = new FakeTransport();
+  const { clock } = fakeClock();
+  const client = makeClient([t], clock);
+  client.start();
+  await t.flush();
+  assert.equal(t.sent.length, 1);
+  const env = JSON.parse(t.sent[0]);
+  assert.equal(env.app, 'youle');
+  assert.equal(env.route, 'agent');
+  assert.equal(env.rpc, 'player_login');
+  assert.equal(env.data.openid, 'o');
+});
+
+test('isSendLoginState 门控：login 响应前的其它包被丢弃，login 响应放行并 emit login', async () => {
+  const t = new FakeTransport();
+  const { clock } = fakeClock();
+  const client = makeClient([t], clock);
+  const messages: any[] = [];
+  let loginResp: any = null;
+  client.on('message', (m: any) => messages.push(m));
+  client.on('login', (d: any) => { loginResp = d; });
+  client.start();
+  await t.flush();
+  // 登录响应前推一个业务包 → 应被门控丢弃
+  t.serverPush(JSON.stringify({ data: JSON.stringify({ route: 'agent', rpc: 'update_bean', data: { bean: 5 } }) }));
+  await t.flush();
+  assert.equal(messages.length, 0);
+  // 推 login 响应 → 放行，emit login，清门控
+  t.serverPush(JSON.stringify({ data: JSON.stringify({ route: 'agent', rpc: 'player_login', data: { state: 0, playerid: 9 } }) }));
+  await t.flush();
+  assert.equal(loginResp.playerid, 9);
+  // 门控已清，后续业务包放行
+  t.serverPush(JSON.stringify({ data: JSON.stringify({ route: 'agent', rpc: 'update_bean', data: { bean: 5 } }) }));
+  await t.flush();
+  assert.equal(messages.length, 1);
+  assert.equal(messages[0].rpc, 'update_bean');
+});
+
+test('握手包与心跳包被忽略且不进 message', async () => {
+  const t = new FakeTransport();
+  const { clock } = fakeClock();
+  const client = makeClient([t], clock);
+  const messages: any[] = [];
+  client.on('message', (m: any) => messages.push(m));
+  client.start();
+  await t.flush();
+  // 先完成登录以清门控
+  t.serverPush(JSON.stringify({ data: JSON.stringify({ route: 'agent', rpc: 'player_login', data: { state: 0, playerid: 9 } }) }));
+  await t.flush();
+  t.serverPush(JSON.stringify({ data: '@toconconABC' }));                          // 握手
+  t.serverPush(JSON.stringify({ data: JSON.stringify({ com: '@serverheartbeat' }) })); // 心跳
+  await t.flush();
+  assert.equal(messages.length, 0);
+});
+
+test('收包超时 emit slow 并触发重连（onClose→新连接重发 login）', async () => {
+  const t1 = new FakeTransport(), t2 = new FakeTransport();
+  const { clock, advance } = fakeClock();
+  const client = makeClient([t1, t2], clock);
+  let slow = 0;
+  client.on('slow', () => { slow++; });
+  client.start();
+  await t1.flush();
+  // 先完成登录：清 4s 守护、feed 收包看门狗（否则 advance 会先撞上 loginGuard 而非 watchdog）
+  t1.serverPush(JSON.stringify({ data: JSON.stringify({ route: 'agent', rpc: 'player_login', data: { state: 0, playerid: 9 } }) }));
+  await t1.flush();
+  // 30s 无收包 → watchdog → slow + 关闭当前连接
+  advance(30000);
+  await t1.flush();
+  assert.equal(slow, 1);
+  // 重连定时器到点 → 新连接 t2 建立并重发 login
+  advance(10000);
+  await t2.flush();
+  assert.equal(t2.sent.length, 1);
+  assert.equal(JSON.parse(t2.sent[0]).rpc, 'player_login');
+});
+
+test('TcpID 去重：旧连接的残留包被丢弃', async () => {
+  const t1 = new FakeTransport(), t2 = new FakeTransport();
+  const { clock, advance } = fakeClock();
+  const client = makeClient([t1, t2], clock);
+  const messages: any[] = [];
+  client.on('message', (m: any) => messages.push(m));
+  client.start();
+  await t1.flush();
+  t1.serverPush(JSON.stringify({ data: JSON.stringify({ route: 'agent', rpc: 'player_login', data: { state: 0, playerid: 9 } }) }));
+  await t1.flush();
+  // 触发重连切到 t2
+  advance(30000); await t1.flush(); advance(10000); await t2.flush();
+  // 旧连接 t1 仍推包 → 应被 TcpID 去重丢弃
+  t1.serverPush(JSON.stringify({ data: JSON.stringify({ route: 'agent', rpc: 'update_bean', data: { bean: 1 } }) }));
+  await t1.flush();
+  assert.equal(messages.length, 0);
+});