Question

我对蓝牙通信很陌生。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（芯片将拥有的角色，一旦我拿到它）和iPad作为中心。

我可以连接设备，也可以从外围设备向中心发送数据。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];
}

但我不能让另一个方向发挥作用。要从中央发送数据，我有以下代码：

[_activePeripheral writeValue:[@"PONG" dataUsingEncoding:NSUTF8StringEncoding] forCharacteristic:_writeChar type:CBCharacteristicWriteWithoutResponse];

我假设应该在外围设备上调用其中一种方法：

- (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

但实际上没有任何反应。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，最后我几乎只能写入外设，因为它是控制信号的发送器。

我希望有人可以帮助我！

Answer 1

以下属性：

_readChar应为CBCharacteristicPropertyRead
_writeChar应为CBCharacteristicPropertyWriteWithoutResponse

有关详细信息，请参阅here。 CBCharacteristicPropertyNotify不允许该特性可写或可读，只能通知（订阅/取消订阅）。

Answer 2

只需使用https://github.com/LGBluetooth/LGBluetooth即可让生活更轻松

CoreBluetooth Central - ＆gt;外围设备

2 个答案: