ios - 外围设备的中心写入特性(iOS 核心蓝牙)

Question

好的，所以我已经浏览了一千个教程和其他 Stack Overflow 线程(所以请不要在没有回答问题的情况下将其列为重复)，我无法弄清楚如何使用此功能。

我已按照本教程进行操作:
http://code.tutsplus.com/tutorials/ios-7-sdk-core-bluetooth-practical-lesson--mobile-20741

我有一个系统，中央可以连接到外围设备并从中读取特征。

我现在正试图让我的中心重写特征内的数据，但我发现我调用的写入行被忽略了。

我已经在我的外围类中声明了我的特征:

self.transferCharacteristic = [[CBMutableCharacteristic alloc] initWithType:[CBUUID UUIDWithString:TRANSFER_CHARACTERISTIC_UUID] properties:CBCharacteristicPropertyNotify|CBCharacteristicPropertyWriteWithoutResponse|CBCharacteristicPropertyRead value:nil permissions:CBAttributePermissionsReadable|CBAttributePermissionsWriteable];

在我的 centralManager 中，我调用了

 [peripheral writeValue:[@"rewritten!" dataUsingEncoding:NSUTF8StringEncoding] forCharacteristic:characteristic type:CBCharacteristicWriteWithoutResponse];

但是这条线被忽略了。谁能告诉我可能出了什么问题？我需要向我的外围类添加一个方法吗？

此外，我已经尝试过使用 WithResponse 进行操作，但它甚至都没有从外围设备调用该方法。

Answer 1

你还在纠结这个问题吗？

我猜您的问题仍然存在，因为您尚未实现 didReceiveWriteRequests方法。

// Processes write command received from a central.

- (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveWriteRequests:(NSArray *)requests
{

    CBATTRequest       *request = [requests  objectAtIndex:0];
    NSData             *request_data = request.value;
    CBCharacteristic   *write_char = request.characteristic;
    //CBCentral*            write_central = request.central;
    //NSUInteger            multi_message_offset = request.offset;

    // Face commands this PWR RX to advertise serno UUID?
    int total_write_requests = 0;
    if ([ write_char.UUID isEqual:[CBUUID UUIDWithString:YOUR_CHARACTERISTIC_UUID]] )
    {


        // Read desired new_state data from central:
        unsigned char *new_state = (unsigned char *)[request_data   bytes];
        my_new_state = new_state[0];
        #endif
        NSLog(@"- advertise serno UUID: %s", my_new_state ? "TRUE" : "FALSE" );

        // Select UUID that includes serno of PWR RX, for advertisements:

        ++total_write_requests;
    }

    if ( total_write_requests )
    {
        [peripheral respondToRequest:request    withResult:CBATTErrorSuccess];  // result = success
    }
    else
    {
        NSLog(@"_no_write_request_FAULT !!");
    }
}

注释掉 [peripheral respondToRequest:request withResult:CBATTErrorSuccess]; ，就像你的情况一样，你正在使用 CBCharacteristicWriteWithoutResponse。

代码取自: where is example of iOS Bluetooth LE peripheralManager didReceiveWriteRequests