ios - swift 4 iOS : Does not discover services of connected BLE device

Question

我正在尝试制作一个能够配置低功耗蓝牙设备的应用程序。现在应用程序已连接到设备，但据我所知，该应用程序不会发现 BLE 设备的服务。

我知道 BLE 设备有很多服务，因为已经有一个 Android 应用程序可以配置相同的设备。

我的连接代码如下:

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
    if peripheral.name == "Sensor"{
        if let name = peripheral.name {
            foundPeripherals.append(name)

            sensor = peripheral
            sensor.delegate = self
            centralManager.connect(sensor, options: nil)

        } else {
            foundPeripherals.append(peripheral.identifier.uuidString)
        }
        RSSIs.append(RSSI)
        if peripheral.name != nil {
            // For viewing the data in the console
            print("--->Peripheral device<---")
            print("Name: \(peripheral.name as Any)")
            print("UUID: \(peripheral.identifier.uuidString)")
            print("RSSI: \(RSSI)")
            print(" -  -  -  -  -  -  -  -  -  -  -  -  -  - ")
            print(advertisementData)
        }
        connectTableView.reloadData()

    }
}


func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
    print("-->Connected to Sensor<--")
    print("Sensor info: \(peripheral)")
    centralManager?.stopScan()

    peripheral.delegate = self

    peripheral.discoverServices(nil)

}

但是我在我的控制台中得到了这个输出:

--->Scanning started<---
--->Peripheral device<---
Name: Optional("Sensor")
UUID: 1AC3DC85-61E0-C3E9-0E33-D98F1D1CA791
RSSI: -43
-  -  -  -  -  -  -  -  -  -  -  -  -  - 
["kCBAdvDataServiceUUIDs": <__NSArrayM 0x2814852c0>(
6E400001-B5A3-F393-E0A9-E50E24DCCA9E
)
, "kCBAdvDataIsConnectable": 1, "kCBAdvDataLocalName": Sensor]
-->Connected to Sensor<--
Sensor info: <CBPeripheral: 0x282bd0820, identifier = 1AC3DC85- 
61E0-C3E9-0E33-D98F1D1CA791, name = Sensor, state = connected>
2018-10-03 14:56:31.029079+0200 Sensor[9686:3266937] 
[CoreBluetooth] API MISUSE: Discovering services for peripheral 
<CBPeripheral: 0x282bd0820, identifier = 1AC3DC85-61E0-C3E9-0E33- 
D98F1D1CA791, name = Sensor, state = connected> while delegate is 
either nil or does not implement peripheral:didDiscoverServices:

它不发现/显示任何服务

希望它有意义并且你们能够提供帮助

-托马斯

Answer 1

在控制台中导入消息:

[CoreBluetooth] API MISUSE: Discovering services for peripheral < CBPeripheral: 0x282bd0820, identifier = 1AC3DC85-61E0-C3E9-0E33-D98F1D1CA791, name = Sensor, state = connected> while delegate is either nil or does not implement peripheral:didDiscoverServices:

您滥用了 CoreBluetooth 框架。

您编写的 peripheral.discoverServices(nil) 导致控制台中出现该错误。由于它不是 while delegate is either nil 这部分，因为你在 peripheral.delegate = self 之前写过，这意味着它是 while delegate does not implement 的部分外围设备:didDiscoverServices:。

在 Swift 中，它是 peripheral(_:didDiscoverServices:)，或者更明确地说是 optional func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?)

这么说之后，您实现了它，执行了 peripheral.discoverCharacteristics(nil, for: service) 并得到了 while delegate is nil or does not implement peripheral:didDiscoverCharacteristicsForService:错误:。

您看到与上一期的类比了吗？所以实现 peripheral(_:didDiscoverCharacteristicsFor:error:) 或更明确地:optional func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?)