feat: BtMonitor 监控 bluetoothctl 状态驱动 BT 指示灯

新增 lib/bt-monitor.js： - 每 3 秒轮询 bluetoothctl show + hcitool con - connected（ACL 连接存在）→ 常亮 - scanning/connecting（Discovering: yes）→ 闪烁 - 无 adapter / Powered: no / 静止 → 熄灭 client.js：启动时开启 BtMonitor，stop() 时清理 provisioning.js：移除所有 led.bt 调用，BT 灯统一由 BtMonitor 管理 Made-with: Cursor
2026-03-24 23:14:02 +08:00
parent dcc20e2cad
commit 837cb8865f
3 changed files with 123 additions and 19 deletions
--- a/lib/bt-monitor.js
+++ b/lib/bt-monitor.js
@@ -0,0 +1,107 @@
+'use strict';
+
+const { execSync } = require('child_process');
+const fs  = require('fs');
+const log = require('./logger');
+const led = require('./led');
+
+const POLL_INTERVAL_MS = 3000;
+
+function findBin(name, candidates) {
+  for (const p of candidates) {
+    try { fs.accessSync(p); return p; } catch (_) {}
+  }
+  return name; // fallback: rely on PATH
+}
+
+/**
+ * 监控蓝牙状态，驱动 BT 指示灯（b6）。
+ *
+ * 状态优先级：
+ *   connected  → 常亮   (hcitool con 检测到 ACL 连接)
+ *   scanning   → 闪烁   (bluetoothctl show: Discovering: yes)
+ *   connecting → 闪烁   (bluetoothctl devices: 有 Connecting 状态)
+ *   off        → 熄灭   (adapter 不存在 / Powered: no / 静止)
+ */
+class BtMonitor {
+  constructor() {
+    this._timer   = null;
+    this._btctl   = findBin('bluetoothctl', [
+      '/usr/bin/bluetoothctl', '/bin/bluetoothctl',
+    ]);
+    this._hcitool = findBin('hcitool', [
+      '/usr/bin/hcitool', '/usr/sbin/hcitool', '/bin/hcitool',
+    ]);
+  }
+
+  start() {
+    this._poll();
+    this._timer = setInterval(() => this._poll(), POLL_INTERVAL_MS);
+    log.info('bt', 'BT 状态监控已启动');
+  }
+
+  stop() {
+    if (this._timer) {
+      clearInterval(this._timer);
+      this._timer = null;
+    }
+    led.bt.off();
+    log.info('bt', 'BT 状态监控已停止');
+  }
+
+  // ── 内部 ──────────────────────────────────────────────────────────────────
+
+  _poll() {
+    try {
+      const state = this._getBtState();
+      if (state === 'connected') {
+        led.bt.on();
+      } else if (state === 'scanning' || state === 'connecting') {
+        led.bt.blink();
+      } else {
+        led.bt.off();
+      }
+    } catch (e) {
+      log.warn('bt', `状态检测异常: ${e.message}`);
+      led.bt.off();
+    }
+  }
+
+  _exec(cmd, timeout = 3000) {
+    return execSync(cmd, {
+      timeout,
+      stdio: ['ignore', 'pipe', 'ignore'],
+      encoding: 'utf8',
+    });
+  }
+
+  _getBtState() {
+    // 1. 检查 adapter 是否存在且已开启
+    let show;
+    try {
+      show = this._exec(`${this._btctl} show`);
+    } catch (_) {
+      return 'off'; // bluetoothctl 不可用 或 无 adapter
+    }
+    if (!show.includes('Powered: yes')) return 'off';
+
+    // 2. 检查是否有已连接的 ACL 设备（A2DP 连接）
+    try {
+      const con = this._exec(`${this._hcitool} con`);
+      if (/ACL\s+[0-9A-Fa-f:]{17}/i.test(con)) return 'connected';
+    } catch (_) {}
+
+    // 3. 部分版本支持 bluetoothctl devices Connected
+    try {
+      const devs = this._exec(`${this._btctl} devices Connected`);
+      if (devs.trim()) return 'connected';
+    } catch (_) {}
+
+    // 4. 检查是否正在扫描
+    if (show.includes('Discovering: yes')) return 'scanning';
+
+    return 'off';
+  }
+}
+
+module.exports = { BtMonitor };