Swift下MbientLab设备MAC获取与MAC连接方案咨询

一、从扫描结果中获取未连接设备的MAC地址 #

iOS CoreBluetooth框架不会直接暴露蓝牙设备的MAC地址，但MbientLab设备的广播数据包中包含了MAC信息，可通过解析设备的制造商数据提取。

修改你的扫描代码，添加MAC解析逻辑：

MetaWearScanner.shared.startScan(allowDuplicates: false) { (device: MetaWear) in
    let id = device.peripheral.identifier.uuidString
    var macAddress: String?
    
    // 解析MbientLab广播中的制造商数据提取MAC
    if let advertisementData = device.peripheral.advertisementData,
       let manufacturerData = advertisementData[CBAdvertisementDataManufacturerDataKey] as? Data {
        // MbientLab的厂商ID为0x0277，广播数据中以小端序存储为[0x77, 0x02]
        if manufacturerData.count >= 8 && manufacturerData.subdata(in: 0..<2) == Data([0x77, 0x02]) {
            // 后续6字节为MAC地址（小端序），反转后转为大端格式匹配设备印刷值
            let macBytes = manufacturerData.subdata(in: 2..<8).reversed()
            macAddress = macBytes.map { String(format: "%02X", $0) }.joined(separator: ":")
        }
    }
    
    if let mac = macAddress {
        logger.trace("Found metawear device name:'\(device.name ?? "Unknown")' id:\(id) MAC:\(mac)")
        self.foundDevicesById[id] = device
        // 可将MAC与设备关联存储，供用户选择
    } else {
        logger.trace("Found metawear device but failed to extract MAC: \(device.name ?? "Unknown")")
    }
}

二、通过给定MAC地址连接MbientLab设备 #

iOS出于隐私限制，不支持直接通过MAC地址获取未扫描到的蓝牙设备，需通过扫描筛选出目标MAC对应的设备后再连接：

1. 扫描并匹配目标MAC #

// 用户输入的目标MAC（格式示例："AA:BB:CC:DD:EE:FF"）
let targetMac = "AA:BB:CC:DD:EE:FF"
var targetDevice: MetaWear?

MetaWearScanner.shared.startScan(allowDuplicates: false) { (device: MetaWear) in
    guard let mac = self.extractMacFromDevice(device) else { return }
    
    if mac.uppercased() == targetMac.uppercased() {
        targetDevice = device
        MetaWearScanner.shared.stopScan()
        self.connectToDevice(device)
    }
}

// 提取MAC的工具方法
private func extractMacFromDevice(_ device: MetaWear) -> String? {
    guard let advertisementData = device.peripheral.advertisementData,
          let manufacturerData = advertisementData[CBAdvertisementDataManufacturerDataKey] as? Data else {
        return nil
    }
    if manufacturerData.count >= 8 && manufacturerData.subdata(in: 0..<2) == Data([0x77, 0x02]) {
        let macBytes = manufacturerData.subdata(in: 2..<8).reversed()
        return macBytes.map { String(format: "%02X", $0) }.joined(separator: ":")
    }
    return nil
}

2. 连接设备并获取MetaWearBoard #

private func connectToDevice(_ device: MetaWear) {
    device.connectAndSetup().continueWith { task in
        if let error = task.error {
            logger.error("Failed to connect: \(error.localizedDescription)")
        } else if let board = task.result {
            logger.trace("Connected to device with MAC: \(self.extractMacFromDevice(device) ?? "Unknown")")
            // 此处可复用Android端的业务逻辑，基于board操作传感器
        }
    }
}

补充说明 #

• 若设备已配对，可通过CoreBluetooth的retrieveConnectedPeripherals(withServices:)方法快速获取，但未配对设备仍需扫描匹配。
• 所有MAC匹配需统一大小写格式，避免因大小写差异导致匹配失败。

内容的提问来源于stack exchange，提问作者steve