CoreBluetooth Central - >外围设备

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问题描述

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）。

I'm quite new to bluetooth communication. My first project intends to transfer data from an iOS device to a BLEshield (small chip).

为了测试我的中心代码，我决定将iPhone设置为外围设备（一旦我拿到它，芯片将拥有的角色）和iPad作为中心。

To test my central code, I decided to setup an iPhone as peripheral (the role the chip will have, once I got it) and an iPad as Central.

我可以连接设备并将数据从外设发送到中央。这很容易：

I can connect the devices and also send data from the peripheral to the central. It's quite easy though:

- (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];
}

但是我不能让另一个方向发挥作用。要从中心发送数据，我有以下代码：

BUT I cannot get the other direction working. To send data from the central side, I have the following code:

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

我假设应该在外设上调用其中一种方法：

I assume that either one of these methods should be called on the peripheral:

- (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。

But actually nothing happens. Unfortunately my hardware project will use a chip that can only work in peripheral mode and in the end I will almost exclusively write to the peripheral as it is an transmitter for control signals.

我希望有人可以帮助我！

I hope someone can help me!

gt