［iOS备忘录］BLE测试传输速度[objectiv-c]

来源：互联网发布：双色球数据库查询系统编辑：程序博客网时间：2024/06/03 20:34

做了一个简单的测试BLE传输速度的app，central使用Mac，peripheral使用iphone6

并非通过传统的传输文件进行测试，所以对于传输文件的问题并不是很适用。

（传输文件的话可以使用NSData将文件分割后再进行传输）

peripheral接收到central的读取数据请求时，每次传送100Byte的数据。

（为什么是100Byte呢？因为楼主测试时，每次最大能传输的数据量是102Byte。。。）

在central可以设置读取数据的大小，并显示平均速度。

peripheral代码：

接收到读取数据请求时的动作：

- (void)peripheralManager:(CBPeripheralManager *)peripheral
    didReceiveReadRequest:(CBATTRequest *)request
{

    [self publishLocalNotificationWithMessage:@"Read!"];

    NSLog(@"Readリクエスト受信！ requested service uuid:%@ characteristic uuid:%@ value:%@",
          request.characteristic.service.UUID,
          request.characteristic.UUID,
          request.characteristic.value);

    if ([request.characteristic.UUID isEqual:self.characteristic.UUID]) {

        //request.value = self.characteristic.value;
        request.value = [self setData];

        [self.peripheralManager respondToRequest:request
                                      withResult:CBATTErrorSuccess];
    }
}

每次读取100Byte的数据（test.csv文件大小为100Byte）

- (NSData *)setData{
    NSData *data = [NSData new];
    NSBundle *bundle = [NSBundle mainBundle];
    NSString *path = [bundle pathForResource:@"test" ofType:@"csv"];
    if (![path isEqualToString:@""]) {
        data = [[NSData alloc] initWithContentsOfFile:path];
    }
    return data;
}

central代码：

一些变量定义：

static int count = 100;
static int dataLength;
static NSDate *startDate;
static NSDate *endDate;
static NSDate *nowDate;// 可省略，直接使用endDate
static NSString *filePath;

点击read按钮时的动作：

- (IBAction)readBtnTapped:(id)sender {

    // 初期化
    if (filePath == nil) {
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        //NSString *path = [documentsDirectory stringByAppendingPathComponent:@"test.csv"];
        filePath = [documentsDirectory stringByAppendingPathComponent:@"test.csv"];
    }
    [self.progressLbl setStringValue:@"0%"];
    [self.speedLbl setStringValue:@"0kbps"];
    [self.receivedStr setString:@""];
    [self.warningLbl setTextColor:[NSColor blackColor]];

    NSString *inputLength = [self.dataLengthTxt stringValue];

    if (![inputLength isEqualToString:@""]) {
        // 整数チェック
        NSCharacterSet *digitCharSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
        NSCharacterSet *aCharacterSet = [NSCharacterSet characterSetWithCharactersInString:inputLength];
        if ([digitCharSet isSupersetOfSet:aCharacterSet]) {
            NSLog(@"数字のみ");
            NSInteger num = [inputLength integerValue];
            dataLength = (int)num * 10;

        } else {
            NSLog(@"数字以外の文字が存在");
            [self.receivedStr setString:@""];
            [self.warningLbl setTextColor:[NSColor redColor]];
            return;
        }

    }else{
        // 10kB
        dataLength = 100;
    }
    count = dataLength;
    NSLog(@"dataLength: %dKB", dataLength/10);
    NSLog(@"入力: %@", inputLength);

    // 受信開始
    [self.peripheral readValueForCharacteristic:self.characteristic];
    NSLog(@"送信開始");
    startDate = [NSDate date];
    //preDate = startDate;
}

读取数据结束时的动作

- (void)                 peripheral:(CBPeripheral *)peripheral
    didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic      // complete reading!
                              error:(NSError *)error
{

    if (error) {
        NSLog(@"Update失敗...error:%@, characteristic uuid:%@, value%@", error, characteristic.UUID, characteristic.value);
        return;
    }

    NSLog(@"Update成功！service uuid:%@, characteristice uuid:%@, value%@",
          characteristic.service.UUID, characteristic.UUID, characteristic.value);

    if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:@"1111"]]) {// peripheral的characteristic的UUID

        //NSLog(@"length: %lu", (unsigned long)characteristic.value.length);
        NSData *data = characteristic.value;
        NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

        [self.receivedStr appendString:str];
        //NSLog(@"receivedStr: %@", self.receivedStr);

        NSData *receivedData = [self.receivedStr dataUsingEncoding:NSUTF8StringEncoding];

        // 進捗
        float per = (float)(receivedData.length)/(dataLength*100);
        int num = (int)(per * 100);
        [self.progressLbl setStringValue:[NSString stringWithFormat:@"%d%@", num, @"%"]];

        // 速度
        nowDate = [NSDate date];
        // 平均速度
        NSTimeInterval interval = [nowDate timeIntervalSinceDate:startDate];
        float speed = (receivedData.length*8)/(float)interval/1000;
        [self.speedLbl setStringValue:[NSString stringWithFormat:@"%.1f%@", speed, @"kbps"]];

        // 受信を続ける
        if(count > 1){
           [self.peripheral readValueForCharacteristic:self.characteristic];
            count--;
            //preDate = [NSDate date];
        }else{

            //NSData *receivedData = [self.receivedStr dataUsingEncoding:NSUTF8StringEncoding];
            NSLog(@"length: %lu", (unsigned long)receivedData.length);
            [receivedData writeToFile:filePath atomically:YES];
            NSLog(@"送信終了");
            endDate = [NSDate date];

            // 開始時間と終了時間の差を表示
            NSTimeInterval interval = [endDate timeIntervalSinceDate:startDate];
            NSLog(@"処理開始時間 = %@",[self getDateString:startDate]);
            NSLog(@"処理終了時間 = %@",[self getDateString:endDate]);
            NSLog(@"処理時間 = %.3f秒",interval);

            // 平均速度
            //float speed = (receivedData.length*8)/(float)interval/1000;
            //[self.speedLbl setStringValue:[NSString stringWithFormat:@"%.1f%@", speed, @"kbps"]];
            [self.lbl03 setStringValue:@"OK"];

        }
    }
}

返回日期

- (NSString*)getDateString:(NSDate*)date
{
    // 日付フォーマットオブジェクトの生成
    NSDateFormatter *dateFormatter = [NSDateFormatter new];
    // フォーマットを指定の日付フォーマットに設定
    [dateFormatter setDateFormat:@"yyyy/MM/dd HH:mm:ss.SSS"];
    // 日付の文字列を生成
    NSString *dateString = [dateFormatter stringFromDate:date];

    return dateString;
}

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