我正在使用 arduino Feather BLE 板,并尝试创建一个可以通过 BLE 向板发送数据的 iOS 应用程序。我可以连接,但无法访问 txCharacteristic
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
guard let characteristics = service.characteristics else {
return
}
for characteristic in characteristics {
if characteristic.properties.contains(.write) || characteristic.properties.contains(.writeWithoutResponse) {
writableCharacteristic = characteristic
}
// if(characteristic.uuid == CBUUID(string: "6e400002-b5a3-f393-e0a9-e50e24dcca9e"))
// {
// txCharacteristic = characteristic
// }
var txUUID = CBUUID(string: "6e400002-b5a3-f393-e0a9-e50e24dcca9e")
let temp = characteristic.uuid.uuidString;
switch characteristic.uuid {
case txUUID:
txCharacteristic = characteristic;
break;
default:
break;
}
peripheral.setNotifyValue(true, for: characteristic)
}
}
此代码可以工作,但只能发现以下 UUID:
temp String "00001532-1212-EFDE-1523-785FEABCD123"
temp String "00001531-1212-EFDE-1523-785FEABCD123"
temp String "00001534-1212-EFDE-1523-785FEABCD123"
我发现这些 UUID 是 DFU UUID。我如何才能发现 txCharacteristic?
<小时/>添加了有关我如何调用 discoveryCharacteristics() 的更多信息:
extension SimpleBluetoothIO: CBPeripheralDelegate {
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
guard let services = peripheral.services else {
return
}
targetService = services.first
if let service = services.first {
targetService = service
peripheral.discoverCharacteristics(nil, for: service)
}
}
最佳答案
通过阅读此网站上的信息,我能够弄清楚这一点: https://learn.adafruit.com/getting-started-with-the-nrf8001-bluefruit-le-breakout/adding-app-support
特别是这部分(请注意,UART 是服务,TX 和 RX 是服务的特征):
UART Service UUID: 6E400001-B5A3-F393-E0A9-E50E24DCCA9E
TX Characteristic UUID: 6E400002-B5A3-F393-E0A9-E50E24DCCA9E
RX Characteristic UUID: 6E400003-B5A3-F393-E0A9-E50E24DCCA9E
所以我需要使用 UART 服务 ID 调用 Peripheral.discoverServices()。在下面的示例中 self.serviceUUID = "6e400001-b5a3-f393-e0a9-e50e24dcca9e"
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
//peripheral.discoverServices(nil)
//peripheral.discoverServices([CBUUID(string: "6e400001-b5a3-f393-e0a9-e50e24dcca9e")])
// Disover peripheral with service UUID that was given to us during initialization (self.serviceUUID)
peripheral.discoverServices([CBUUID(string: self.serviceUUID)])
}
然后在 didDiscoverCharacteristicsFor 服务中我需要查找 TX 特征 ID:
// Did Discover Characteristics
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
guard let characteristics = service.characteristics else {
return
}
for characteristic in characteristics {
if characteristic.properties.contains(.write) || characteristic.properties.contains(.writeWithoutResponse) {
writableCharacteristic = characteristic
}
// TX Characteristic UUID: 6E400002-B5A3-F393-E0A9-E50E24DCCA9E
// https://learn.adafruit.com/getting-started-with-the-nrf8001-bluefruit-le-breakout/adding-app-support
let txUUID = CBUUID(string: "6e400002-b5a3-f393-e0a9-e50e24dcca9e")
switch characteristic.uuid {
case txUUID:
txCharacteristic = characteristic;
break;
default:
break;
}
peripheral.setNotifyValue(true, for: characteristic)
}
}
关于iOS 低功耗蓝牙 (BLE) 未发现 TX 特性,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46576345/