CoreBluetooth - writeValue。接收方无法从我的iPhone接收任何数据

Question

这是一个与CoreBluetooth合作的项目。我使用我的iPhone 5c运行它。外设是单片机。iPhone可以接收来自单片机的数据。但是单片机不能通过[_peripheral writeValue:value forCharacteristic:_writeCharacteristic type:CBCharacteristicWriteWithResponse];接收来自iPhone的数据

以下是我的代码的一部分。

#define kServiceUUID @"FFE0"
#define kCharacteristicUUID @"FFE1"
#import "BTManager.h"

@interface BTManager()<CBCentralManagerDelegate, CBPeripheralDelegate>{
CBCentralManager *manager;
}

@property (strong,nonatomic) NSMutableArray *peripherals;
@property (nonatomic, strong) CBCharacteristic *writeCharacteristic;
@property (nonatomic, strong) CBPeripheral *peripheral;
@end

@implementation BTManager

#pragma mark - Public Methods

- (void)writeToPeripheral:(NSString *)dataString {
    if(_writeCharacteristic == nil){
        NSLog(@"writeCharacteristic is nil");
        return;
    }
    NSData *value = [self dataWithHexstring:dataString];
    NSLog(@"hex data:%@",value);
    [_peripheral writeValue:value forCharacteristic:_writeCharacteristic type:CBCharacteristicWriteWithResponse];
    NSLog(@"didWriteTo%@ characteristic:%@ data:%@",_peripheral.name,_writeCharacteristic.description,dataString);

}

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error {
    if (error) {
        NSLog(@"discoverCharacteristic:%@ Error:%@", service.UUID, [error localizedDescription]);
        return;
    }
    NSLog(@"Service:%@",service.UUID);
    for (CBCharacteristic *characteristic in service.characteristics) {
        if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:kCharacteristicUUID]]) {
            NSLog(@"setNotifyValuefor:%@",characteristic);
            _writeCharacteristic = characteristic;
            [self.peripheral setNotifyValue:YES forCharacteristic:characteristic];
        }
    }
}

Answer 1

我不认为你提供的源代码有任何问题。您尝试写入的特定外围设备是什么？

我想我会问的问题是

在peripheral: didWriteValueForCharacteristic: error:中接收任何类型的响应的characteristic?

• Are上是否确实支持writeWithResponse

如果你在上面提到的委托回调中没有看到响应，我会质疑外围设备是否正确地响应了写命令。