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CoreBluetooth系列教程(三):Mac地址的获取及写入指令的处理 - 宋明的博客
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<h1 class="title">
CoreBluetooth系列教程(三):Mac地址的获取及写入指令的处理
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<a href="http://apolla.cc">宋明</a>
<span style="color: #ccc;">|</span>
<span class="date"><i class="fa fa-calendar-check-o" aria-hidden="true"></i> 2023/03/18</span>
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<h2><a id="mac%E5%9C%B0%E5%9D%80%E7%9A%84%E8%8E%B7%E5%8F%96" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>Mac地址的获取</h2>
<p>iOS7之后，苹果不支持获取Mac地址，只能用UUID来标识设备。若想获得Mac地址，可以跟硬件工程师沟通，增加一个指令获取，也可以让硬件工程师把Mac地址写到广播包里，在扫描的时候获取Mac地址，如下所示：</p>
<pre class="line-numbers"><code class="language-swift"> func centralManager(_ central: CBCentralManager,
didDiscover peripheral: CBPeripheral,
advertisementData: [String: Any],
rssi RSSI: NSNumber)
{
// 在 advertisementData里读取，获取的manufacturerData是二进制数据，需要转换成UInt8数据，然后根据约定的格式解析成Mac地址。
let data = advertisementData["kCBAdvDataManufacturerData"] as? Data {
let macString = BlueUtil.getIOSMacString(data:[UInt8](manufacturerData) )
// FD:00:EA:00:85:9C
}
</code></pre>
<h2><a id="%E5%86%99%E5%85%A5%E6%95%B0%E6%8D%AE%E7%9A%84%E5%A4%84%E7%90%86" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>写入数据的处理</h2>
<p>调用writeValue写入指令，可以看到，需要把指令转换成Data 数据。譬如<a href="%E4%B8%80%E8%88%AC%E6%9D%A5%E8%AE%B2%E7%AC%AC%E4%B8%80%E4%BD%8D%E6%98%AF%E6%8C%87%E4%BB%A4%E5%A4%B4%EF%BC%8C%E5%80%92%E6%95%B0%E7%AC%AC%E4%BA%8C%E4%BD%8D%E6%98%AF%E6%A0%A1%E9%AA%8C%E7%A0%81%EF%BC%8C%E5%90%84%E5%AE%B6%E5%85%AC%E5%8F%B8%E4%B8%8D%E4%B8%80%E6%A0%B7%EF%BC%8C%E6%A0%B9%E6%8D%AE%E5%AE%9E%E9%99%85%E6%83%85%E5%86%B5%EF%BC%8C%E4%B8%8D%E5%A4%9A%E5%8F%99%E8%BF%B0">217, 162, 3, 25, 188, 153</a>。</p>
<pre class="line-numbers"><code class="language-swift"> open func writeValue(_ data: Data, for characteristic: CBCharacteristic, type: CBCharacteristicWriteType)
// 对应的回调代理
@objc func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {
}
</code></pre>
<p>跟硬件交互涉及到大小端的问题。大端模式，是指数据的高字节保存在内存的低地址中，而数据的低字节保存在内存的高地址中。小端模式，是指数据的高字节保存在内存的高地址中，而数据的低字节保存在内存的低地址中，有兴趣的具体见<a href="https://link.juejin.cn/?target=https%3A%2F%2Fblog.csdn.net%2Fmolaifeng%2Farticle%2Fdetails%2F117258030">大小端</a>。</p>
<pre class="line-numbers"><code class="language-swift"> // 数据转换
private func converSendData(send :[Int]) -> Data {
var result = Data()
for i in send {
var bts = [i]
let data = Data(bytes: &bts, count: 1)
result.append(data)
}
return result
}
</code></pre>
<p>需要注意的是使用Data(bytes: UnsafeRawPointer, count: Int)时，一定要注意传入的count,最后生成的二进制数据要符合硬件的要求(蓝牙一次能写入的最大数据为20bytes),否则写入失败。</p>
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