diff --git a/README.md b/README.md
index 0c862ef..9864952 100644
--- a/README.md
+++ b/README.md
@@ -31,21 +31,31 @@ npx patch-package
 运行下面命令启动：
 
 ```sh
-node index.mjs profile@host:port
+node index.mjs profile@hostname[:port]
 ```
 
+参数含义：
+
+ + `profile`：表示连接到服务器使用的角色名
+ + `hostname`：服务器地址
+ + `port`：服务器端口（可选，默认值为 25565）
+
 命令行选项：
 
  + `--offline`：使用离线模式启动
- + `--credentials-lib <file>`：指定登录凭据文件（默认值：`credentials.json`）
- + `--no-repl`：禁用终端内 REPL
- + `--protocal`：指定服务器版本（不指定时自动检测）
+ + `--credentials-lib <file>`：指定登录凭据文件（可选，默认值：`credentials.json`）
+ + `--no-local-repl`：禁用终端内 REPL
+ + `--protocal`：指定服务器版本（可选，不指定时自动检测）
  + `--owner`: 指定 REPL 上下文内 `owner()` 函数返回的玩家
+ + `--enable-tcp-repl`：启用基于 TCP 连接的远程 REPL
+   * `--tcp-repl-port`：TCP 远程 REPL 的服务端口（可选，默认值 2121）
+ + `--remote-repl-passcode-length`：远程 REPL 的服务口令强度（可选，默认值 8）
 
 ## REPL
 
 REPL 上下文内预先定义了如下变量/函数/类型：
 
+ + `PI`：常数，等于 `Math.PI`
  + `bot`：机器人对象
  + `Vec3`：3 维向量类型
  + `debug`：调试日志模块
@@ -57,4 +67,5 @@ REPL 上下文内预先定义了如下变量/函数/类型：
  + `sc.debug_mfc()`：缩写，等价于 `debug.enable('mineflayer-control')`
  + `sc.debug_mff()`：缩写，等价于 `debug.enable('mineflayer-fly-control')`
  + `sc.sleep`：缩写，等价于 `lib.utils.asyncSleep`
- + `sc.tossHeld`：缩写，等价于 `bot.tossStack(bot.heldItem)`
+ + `sc.tossHeld()`：缩写，等价于 `bot.tossStack(bot.heldItem)`
+ + `bb`：所有 REPL 实例的共享数据
diff --git a/index.mjs b/index.mjs
index a1c7286..ade2df5 100644
--- a/index.mjs
+++ b/index.mjs
@@ -5,6 +5,8 @@ import { asyncSleep, parseLogin, waitEvent } from 'compass-utils';
 import repl from 'node:repl';
 import 'enhanced-vec3';
 import debug from 'debug';
+import { createLocalRepl, createTcpReplServer } from './repl/index.mjs';
+import { randomBytes } from 'node:crypto';
 
 async function main() {
 	const args = yargs((await import('yargs/helpers')).hideBin(process.argv))
@@ -16,8 +18,8 @@ async function main() {
 		description: 'Bot\'s owner name.',
 		type: 'string',
 		requiresArg: false,
-	}).option('no-repl', {
-		description: 'Disable bot REPL control.',
+	}).option('no-local-repl', {
+		description: 'Disable bot REPL control in current stdin/stdout.',
 		type: "boolean",
 	}).option('credentials-lib', {
 		description: 'Credentials\' library file.',
@@ -26,11 +28,22 @@ async function main() {
 	}).option('offline', {
 		description: 'Login without credentials.',
 		type: 'boolean',
-	}).usage('Uasge: profile@host:port').help().alias('help', 'h').argv;
+	}).option('enable-tcp-repl', {
+		description: 'Enable bot REPL control as a TCP service.',
+		type: 'boolean',
+	}).option('tcp-repl-port', {
+		description: 'Telnet REPL service port.',
+		type: 'number',
+		default: 2121,
+	}).option('remote-repl-passcode-length', {
+		description: 'Length of remote REPL passcode in bytes',
+		type: 'number',
+		default: 8,
+	}).usage('Uasge: profile@hostname[:port]').help().alias('help', 'h').argv;
 
 	let login_info = args._[0];
 	if (login_info == null) { return; }
-	const [name, host, port] = parseLogin(login_info);
+	const [name, hostname, port] = parseLogin(login_info);
 
 	let session, endpoint = null;
 	if (args.offline) {
@@ -45,7 +58,7 @@ async function main() {
 	}
 
 	const bot = mineflayer.createBot({
-		host, port, version: args.protocal,
+		host: hostname, port, version: args.protocal,
 		...session.mineflayer(endpoint)
 	});
 	bot.on('error', console.error);
@@ -61,6 +74,7 @@ async function main() {
 	bot.loadPlugin((await import('mineflayer-fly-control')).default);
 	await bot.waitEvent('spawn');
 
+	const context_shared = {};
 	async function loadReplContextModules(context) {
 		context.lib = {
 			utils: await import('compass-utils'),
@@ -75,7 +89,9 @@ async function main() {
 			return bot.players[args.owner];
 		};
 
+		context.PI = Math.PI;
 		context.debug = debug;
+		context.bb = context_shared;
 		context.sc = {};
 		context.sc.pos = () => bot.entity.position;
 		context.sc.debug_mfc = () => debug.enable('mineflayer-control');
@@ -84,22 +100,20 @@ async function main() {
 		context.sc.tossHeld = () => bot.tossStack(bot.heldItem);
 	}
 
-	if (!args.noRepl) {
-		let r = repl.start({
-			prompt: 'local > ',
-			input: process.stdin,
-			output: process.stdout,
-			color: true,
-			terminal: true,
-			ignoreUndefined: true,
-		});
+	if (args.enableTcpRepl) {
+		const passcode = randomBytes(args.remoteReplPasscodeLength);
+		console.log('Remote REPL Passcode:', passcode.toString('hex'));
+		let server = createTcpReplServer(args.tcpReplPort, passcode, loadReplContextModules);
+		process.on('exit', () => server.close());
+	}
 
-		r.on('exit', () => bot.quit());
-		loadReplContextModules(r.context);
+	if (!args.noLocalRepl) {
+		let repl_local = createLocalRepl(loadReplContextModules);
+		repl_local.on('exit', () => bot.quit());
 	}
 }
 
 main().catch(err => {
-	console.error('Error: ', err);
+	console.error(`Error: ${err}`);
 	process.exit(1);
 });
diff --git a/repl/index.mjs b/repl/index.mjs
new file mode 100644
index 0000000..eb30448
--- /dev/null
+++ b/repl/index.mjs
@@ -0,0 +1,85 @@
+import repl from 'node:repl';
+import net from 'node:net';
+import { Buffer } from 'node:buffer';
+import { timingSafeEqual } from 'node:crypto';
+import { waitEvent } from 'compass-utils';
+import { RemoteTTY } from './remote-tty.mjs';
+
+import debug from 'debug';
+const logger = debug('compass-repl');
+
+export function createRepl(istream, ostream, prompt, contextLoader) {
+	let r = repl.start({
+		prompt: `${prompt} > `,
+		input: istream,
+		output: ostream,
+		color: true,
+		terminal: true,
+		ignoreUndefined: true,
+	});
+	r.on('SIGCONT', () => { });
+	r.on('SIGTSTP', () => {});
+	contextLoader(r.context);
+	return r;
+}
+
+export function createLocalRepl(contextLoader) {
+	return createRepl(process.stdin, process.stdout, 'local', contextLoader);
+}
+
+export function createTcpReplServer(port, passcode, contextLoader) {
+	const connect_repl_sockets = new Set();
+	let server = net.createServer(socket => {
+		logger('New TCP connection');
+		function verifyPasscode(data) {
+			let pdata = Buffer.from(data);
+			logger(`Got passcode: ${pdata.toString('hex')}`);
+			let flag = true;
+			if (pdata.length != passcode.length) {
+				flag = false;
+				pdata = passcode;
+			}
+			if (timingSafeEqual(passcode, pdata) && flag) {
+				logger('Passcode correct, 0x21!');
+				socket.write(Buffer.from([0x21]));
+				let tty = new RemoteTTY({}, socket, socket);
+				tty.ttyReady().then(() => {
+					logger('Remote TTY is ready, starting REPL');
+					let r = createRepl(tty, tty, 'tcp', contextLoader);
+					r.on('exit', () => {
+						connect_repl_sockets.delete(socket);
+						socket.destroy();
+					});
+					connect_repl_sockets.add(socket);
+				}).catch(err => {
+					logger(`TTY Ready Error: ${err}`);
+					socket.destroy();
+				});
+			} else {
+				logger('Passcode incorrect, 0x20!');
+				socket.write(Buffer.from([0x20]));
+				socket.destroy();
+			}
+		}
+
+		try {
+			socket.once('data', (data) => verifyPasscode(data));
+
+			socket.on('close', () => {
+				logger('Disconnected');
+				connect_repl_sockets.delete(socket);
+			});
+		} catch(err) {
+			logger(`Remote Connect Error: ${err}`);
+			connect_repl_sockets.delete(socket);
+			socket.destroy();
+		}
+	});
+	server.listen(port);
+	process.on('exit', () => {
+		for (const socket of connect_repl_sockets) {
+			socket.destroy();
+		}
+	});
+	return server;
+}
diff --git a/repl/remote-tty.mjs b/repl/remote-tty.mjs
new file mode 100644
index 0000000..1021f43
--- /dev/null
+++ b/repl/remote-tty.mjs
@@ -0,0 +1,197 @@
+import { waitEvent } from 'compass-utils';
+import { randomBytes } from 'node:crypto';
+import { Duplex } from 'node:stream';
+import { promisify } from 'node:util';
+
+import debug from 'debug';
+const logger = debug('compass-repl:RemoteTTY');
+
+const kSource = Symbol('kSource');
+
+export class RemoteTTY extends Duplex {
+	#rows
+	#cols
+	#color_depths
+	#tty_ready
+	#tty_ready_resolve
+	#event_callbacks
+	constructor(options, input, output) {
+		super(options);
+		this[kSource] = {
+			input: input,
+			output: output,
+		};
+		this.#tty_ready = new Promise(resolve => {
+			this.#tty_ready_resolve = resolve;
+		});
+		this.#event_callbacks = new Map();
+		this[kSource].input.on('close', () => this.push(null));
+		this[kSource].input.on('data', (data) => {
+			try {
+				if (!(data instanceof Buffer)) {
+					data = Buffer.from(data);
+				}
+
+				if (data[0] === 0x02) {
+					if (!this.push(data.slice(1))) {
+						this[kSource].input.pause();
+					}
+					return;
+				}
+
+				if (data[0] === 0x01) {
+					// Initialize data
+					this.#rows = data.readUInt16BE(1);
+					this.#cols = data.readUInt16BE(3);
+					this.#color_depths = data.readUInt8(5);
+					if (this.#tty_ready_resolve) {
+						this.#tty_ready_resolve();
+						this.#tty_ready_resolve = null;
+					}
+				} else if (data[0] == 0x03) {
+					// Resize event
+					this.#rows = data.readUInt16BE(1);
+					this.#cols = data.readUInt16BE(3);
+					this.emit('resize');
+				} else if (data[0] == 0x04) {
+					// Callback
+					let id = (data.readBigUInt64BE(1) << 64n) + data.readBigUInt64BE(9);
+					if (this.#event_callbacks.has(id)) {
+						logger(`Rescived callback ${data.toString('hex')}`);
+						this.#event_callbacks.get(id)();
+						this.#event_callbacks.delete(id);
+					}
+				}
+			} catch (err) {
+				//
+			}
+		});
+	}
+
+	get rows() {
+		return this.#rows;
+	}
+
+	get columns() {
+		return this.#cols;
+	}
+
+	getWindowSize() {
+		return [this.#rows, this.#cols];
+	}
+
+	getColorDepth() {
+		return this.#color_depths;
+	}
+
+	hasColors(count = 16) {
+		return (1 << this.#color_depths) >= count;
+	}
+
+	#registerCallback(data, callback) {
+		let cbid = randomBytes(16);
+		let cbid_v = (cbid.readBigUInt64BE(0) << 64n) + cbid.readBigUInt64BE(8);
+		if (callback) {
+			logger(`Registered callback ${cbid.toString('hex')}`);
+			this.#event_callbacks.set(cbid_v, callback);
+		}
+		cbid.copy(data, 1);
+	}
+
+	clearLine(dir, callback) {
+		logger('clearLine');
+		let data = Buffer.alloc(18);
+		data[0] = 0x10;
+		data.writeInt8(dir, 17);
+		this.#registerCallback(data, callback);
+		this.#sendData(data);
+		return this.writableNeedDrain;
+	}
+
+	clearScreenDown(callback) {
+		logger('clearScreenDown');
+		let data = Buffer.alloc(17);
+		data[0] = 0x11;
+		this.#registerCallback(data, callback);
+		this.#sendData(data);
+		return this.writableNeedDrain;
+	}
+
+	cursorTo(x, y, callback) {
+		logger('cursorTo');
+		let data = Buffer.alloc(22);
+		if (typeof y !== 'number') {
+			callback = y;
+			y = 0;
+			data[17] = 0x01;
+		} else {
+			data[17] = 0x00;
+		}
+		data[0] = 0x12;
+		data.writeUInt16BE(x, 18);
+		data.writeUInt16BE(y, 20);
+
+		this.#registerCallback(data, callback);
+		this.#sendData(data);
+		return this.writableNeedDrain;
+	}
+
+	moveCursor(dx, dy, callback) {
+		logger('moveCursor');
+		let data = Buffer.alloc(21);
+		data[0] = 0x13;
+		data.writeUInt16BE(dx, 17);
+		data.writeUInt16BE(dy, 19);
+
+		this.#registerCallback(data, callback);
+		this.#sendData(data);
+		return this.writableNeedDrain;
+	}
+
+	async #sendData(data) {
+		if (this[kSource].output.writableNeedDrain) {
+			await waitEvent(this[kSource].output, 'darin');
+		}
+		const writePromise = promisify((data, callback) =>
+			this[kSource].output.write(data, 'utf-8', callback));
+		await writePromise(data);
+	}
+
+	_construct(callback) {
+		callback();
+	}
+
+	_write(chunk, encoding, callback) {
+		if (!(chunk instanceof Buffer)) {
+			chunk = Buffer.from(chunk, encoding);
+		}
+		chunk = Buffer.concat([Buffer.from([0x02]), chunk]);
+		this.#sendData(chunk).then(() => callback(null)).catch(err => callback(err))
+	}
+
+	_destroy(err, callback) {
+		this[kSource].input.destory(err);
+		this[kSource].output.destory(err);
+		callback();
+	}
+
+	_read(_size) {
+		this[kSource].input.resume();
+	}
+
+	setRawMode() {
+		return this;
+	}
+
+	get isRaw() {
+		return true;
+	}
+
+	get isTTY() {
+		return true;
+	}
+
+	ttyReady() {
+		return this.#tty_ready;
+	}
+};
diff --git a/scripts/tcp-repl-client.mjs b/scripts/tcp-repl-client.mjs
new file mode 100644
index 0000000..ae5ef55
--- /dev/null
+++ b/scripts/tcp-repl-client.mjs
@@ -0,0 +1,161 @@
+import { Readable, Writable } from 'node:stream';
+import { promisify } from 'node:util';
+import net from 'node:net';
+import { waitEvent } from 'compass-utils';
+import readline from 'node:readline';
+import yargs from 'yargs';
+
+/**
+ * @param {Readable} input 
+ * @param {Writable} output 
+ */
+function ttyServer(input, output) {
+	const stdin = process.stdin;
+	const stdout = process.stdout;
+	stdin.setRawMode(true);
+
+	const writePromise = promisify((data, callback) => output.write(data, 'utf-8', callback));
+	async function sendData(data) {
+		if (!output.writable) {
+			return;
+		}
+		if (output.writableNeedDrain) {
+			await waitEvent(output, 'darin');
+		}
+		await writePromise(data);
+	}
+
+	stdin.on('data', async (chunk) => {
+		if (chunk.length === 1 && chunk[0] === 4) {
+			stdin.emit('end');
+		}
+		chunk = Buffer.concat([Buffer.from([0x02]), chunk]);
+		await sendData(chunk);
+	});
+
+	stdin.on('close', () => socket.destroy());
+
+	let init_data = Buffer.alloc(6);
+	init_data[0] = 0x01;
+	init_data.writeUInt16BE(stdout.rows, 1);
+	init_data.writeUInt16BE(stdout.columns, 3);
+	init_data.writeUInt8(stdout.getColorDepth(), 5);
+	sendData(init_data);
+
+	stdout.on('resize', () => {
+		let resize_data = Buffer.alloc(5);
+		resize_data[0] = 0x03;
+		resize_data.writeUInt16BE(stdout.rows, 1);
+		resize_data.writeUInt16BE(stdout.columns, 3);
+		sendData(resize_data);
+	});
+
+	stdout.on('drain', () => input.resume());
+	input.on('end', () => {
+		console.log('\nDisconnected (Server).');
+		process.exit(0);
+	});
+	stdin.on('end', () => {
+		input.destroy();
+		output.destroy();
+		console.log('\nDisconnected (Client).');
+		process.exit(0);
+	});
+	input.on('data', (data) => {
+		if (!(data instanceof Buffer)) {
+			data = Buffer.from(data);
+		}
+
+		if (data[0] === 0x02) {
+			if (!stdout.write(data)) { input.pause(); }
+			return;
+		}
+
+		if (data[0] == 0x10) {
+			// clearLine
+			let res = Buffer.alloc(17);
+			data.copy(res, 1, 1, 17);
+			res[0] = 0x04;
+			let dir = data.readInt8(17);
+			stdout.clearLine(dir, () => {
+				sendData(res);
+			});
+		} else if (data[0] == 0x11) {
+			// clearScreenDown
+			let res = Buffer.alloc(17);
+			data.copy(res, 1, 1, 17);
+			res[0] = 0x04;
+			stdout.clearScreenDown(() => {
+				sendData(res);
+			});
+		} else if (data[0] == 0x12) {
+			// cursorTo
+			let res = Buffer.alloc(17);
+			data.copy(res, 1, 1, 17);
+			res[0] = 0x04;
+			let flag = data[17];
+			let x = data.readUInt16BE(18);
+			let y = data.readUInt16BE(20);
+			if (flag) {
+				stdout.cursorTo(x, () => {
+					sendData(res);
+				});
+			} else {
+				stdout.cursorTo(x, y, () => {
+					sendData(res);
+				});
+			}
+		} else if (data[0] == 0x13) {
+			// moveCursor
+			let res = Buffer.alloc(17);
+			data.copy(res, 1, 1, 17);
+			res[0] = 0x04;
+			let dx = data.readUInt16BE(17);
+			let dy = data.readUInt16BE(19);
+			stdout.moveCursor(dx, dy, () => {
+				sendData(res);
+			});
+		}
+	});
+}
+
+async function main() {
+	const args = yargs((await import('yargs/helpers')).hideBin(process.argv))
+	.option('port', {
+		description: 'Remote TCP REPL service port.',
+		default: 2121,
+	}).usage('Uasge: hostname').help().alias('help', 'h').argv;
+
+	let socket = net.connect(args.port, args._[0]);
+	await waitEvent(socket, 'connect');
+	const rl = readline.createInterface({
+		input: process.stdin,
+		output: process.stdout,
+	});
+
+	const question = promisify(rl.question).bind(rl);
+	const passcode_string = (await question('Passcode: ')).trim();
+	const passcode = Buffer.from(passcode_string, 'hex');
+	if (passcode.length == 0) {
+		console.log('A passcode is required.');
+		process.exit(1);
+	}
+	rl.close();
+
+	const sendPasscode = promisify((cb) => socket.write(passcode, cb));
+	await sendPasscode();
+	let res = await waitEvent(socket, 'data');
+	if (res[0] == 0x20) {
+		console.log('Passcode incorrect.');
+		process.exit(1);
+	}
+	console.log('Connected.');
+	process.stdin.resume();
+	ttyServer(socket, socket);
+	console.log(process.stdin.isRaw);
+}
+
+main().catch(err => {
+	console.error(`Error: ${err}`);
+	process.exit(1);
+});
diff --git a/utils/misc.mjs b/utils/misc.mjs
index 97d3f8d..f0b36f8 100644
--- a/utils/misc.mjs
+++ b/utils/misc.mjs
@@ -30,15 +30,23 @@ export function waitEvent(em, event) {
 	});
 }
 
-export function asyncSleep(t) {
+/**
+ * @param {number} timeout
+ * @returns {Promise<void>}
+ */
+export function asyncSleep(timeout) {
 	return new Promise((resolve, _reject) => {
-		setTimeout(resolve, t);
+		setTimeout(resolve, timeout);
 	});
 }
 
-export function asyncTimeout(t) {
+/**
+ * @param {number} timeout
+ * @returns {Promise<void>}
+ */
+export function asyncTimeout(timeout) {
 	return new Promise((_resolve, reject) => {
-		setTimeout(reject, t);
+		setTimeout(reject, timeout);
 	});
 }