Question

我正在开发一款利用Core Bluetooth的Appcelerator模块。我可以毫无问题地连接到外设，并订阅特性。我已经谴责了所有委托函数，并且所有内容似乎都按预期触发，除了在尝试读取或写入时我得到“不太可能的错误”。我的核心方法如下所示。

-(void)readValueForCharacteristicByUUID:(NSString *)uuidstring
{
if (self.connectedService)
{
    CBMutableCharacteristic* characteristic = [self characteristicFromUUIDstring:uuidstring];
    if (characteristic)
    {
        [self.connectedPeripheral readValueForCharacteristic:characteristic];
    }
} else {
    NSLog(@"[INFO] No service to read");
}
}

-(void)writeValue:(NSData*)value ForCharacteristicByUUID:(NSString*)uuidstring
{
if (self.connectedService)
{
    CBMutableCharacteristic* characteristic = [self characteristicFromUUIDstring:uuidstring];
    if (characteristic)
    {
        [self.connectedPeripheral writeValue:value forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];
    }
} else {
    NSLog(@"[INFO] No service to write to");
}
}

-(CBMutableCharacteristic*)characteristicFromUUIDstring:(NSString*)uuidstring
{
for (CBMutableCharacteristic* c in self.connectedService.characteristics)
{
    if ([c.UUID.UUIDString isEqualToString:uuidstring])
    {
        return c;
    }
}
NSLog(@"No Characteristic found with that uuid");
}

我认为它可能是权限问题，所以这里是我用来在我的外围设备中创建特征的代码。

CBMutableCharacteristic* c = [[CBMutableCharacteristic alloc] initWithType:cuuid
                                                                properties:CBCharacteristicPropertyRead|CBCharacteristicPropertyWrite|
                                                                    CBCharacteristicPropertyNotify
                                                                     value:nil
                                                               permissions:CBAttributePermissionsReadable|CBAttributePermissionsWriteable];

Answer 1

来自CBMutableCharacteristic class reference

CBMutableCharacteristic对象代表a的特征本地外围设备的服务（代表本地外围设备）通过CBPeripheralManager对象）。

您无法使用process.stdout实例和CBMutableCharacteristic与远程外围设备进行通信。

在连接的CBCentralManager上调用CBCharacteristic后，您必须使用返回到外围设备peripheral:didDiscoverCharacteristicsForService:error:委托方法的discoverCharacteristics:forService:。

iOS CoreBluetooth不太可能出错

1 个答案: