我对蓝牙通信还很陌生。我的第一个项目打算将数据从 iOS 设备传输到 BLEshield(小芯片)。
为了测试我的中央代码，我决定将 iPhone 设置为外围设备(一旦我拿到芯片，芯片将扮演的角色)并将 iPad 设置为中央。
我可以连接设备，也可以将数据从外围设备发送到中央设备。不过这很容易:
- (void)startService {
_readChar = [[CBMutableCharacteristic alloc] initWithType:[CBUUID ...] properties:CBCharacteristicPropertyNotify value:nil permissions:CBAttributePermissionsReadable];
_writeChar = [[CBMutableCharacteristics alloc] initWithType:[CBUUID ...] properties:CBCharacteristicPropertyNotify value:nil permissions:CBAttributePermissionsWriteable];
_service = [[CBMutableService alloc] initWithType:[CBUUID ...] primary:YES];
[_service setCharacteristics:@[_readChar, _writeChar]];
_peripheral = [[CBPeripheralManager alloc] initWithDelegate:self queue:nil];
[_peripheral addService:_service];
[_peripheral startAdvertising:@{CBAdvertisementDataServiceUUIDKey: @[[CBUUID ...]], CBAdvertisementDataLocalNameKey: @"ServiceName"}];
}
- (void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didSubscribeToCharacteristic:(CBCharacteristic *)characteristic {
[_peripheral updateValue:[@"HELLO WORLD" dataUsingEncoding:NSUTF8StringEncoding] forCharacteristic:_readChar onSubscribedCentrals:nil];
}
但我无法让另一个方向工作。要从中央端发送数据，我有以下代码:
[_activePeripheral writeValue:[@"PONG" dataUsingEncoding:NSUTF8StringEncoding] forCharacteristic:_writeChar type:CBCharacteristicWriteWithoutResponse];
我假设应该在外设上调用这些方法中的任何一个:
- (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveReadRequest:(CBATTRequest *)request
- (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveWriteRequests:(NSArray *)requests
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
- (void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
但实际上什么也没有发生。不幸的是，我的硬件项目将使用只能在外设模式下工作的芯片，最后我几乎只写入外设，因为它是控制信号的发射器。
我希望有人能帮助我!
最佳答案
属性:
_readChar应该是CBCharacteristicPropertyRead_writeChar应该是CBCharacteristicPropertyWriteWithoutResponse
参见 here更多细节。 CBCharacteristicPropertyNotify 不允许特征可写或可读，它只能通知(订阅/取消订阅)。
关于ios - CoreBluetooth 中央 --> 外设，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20034433/