Question

我正在尝试使用代码段来编写数据。

- (void)peripheral:(CBPeripheral *)peripheral1 didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
    // Again, we loop through the array, just in case.
    for (CBCharacteristic *characteristic in service.characteristics) {

        // And check if it's the right one
        if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:TRANSFER_CHARACTERISTIC_UUID]]) {
            NSString *payloadMessage = @"3N";
            NSData *payload = [payloadMessage dataUsingEncoding:NSUTF8StringEncoding];
            [_discoveredPeripheral discoverDescriptorsForCharacteristic:characteristic];
            [_discoveredPeripheral writeValue:payload forCharacteristic:characteristic
                              type:CBCharacteristicWriteWithResponse];
            [_discoveredPeripheral setNotifyValue:YES forCharacteristic:characteristic];

        }
    }

}

但在

中收到错误

 - (void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error
{

}

如：的 Error Domain=CBATTErrorDomain Code=3 "Writing is not permitted." UserInfo={NSLocalizedDescription=Writing is not permitted.}

虽然同样适用于android。

Answer 1

如果对特征使用了错误的写入类型（假设特性是可写的），则会出现该错误。将特征写入特征有两种类型：

CBCharacteristicWriteWithResponse：在这种情况下，您将获得外围设备的确认包。您可以将其视为TCP数据包。
CBCharacteristicWriteWithoutResponse：这是一种“一劳永逸”的写作。您可以将其视为UDP数据包。

因此，请尝试使用CBCharacteristicWriteWithoutResponse代替CBCharacteristicWriteWithResponse。如果这不起作用，你可能必须检查你的特征是否可写。

无法将数据发送到BLE外设（ZL-RC04A）设备

1 个答案: