iOS 藍牙分包發送數據

因為 BLE 緩存區最多一次接收20字節的數據，發送數據時需對數據做分包處理。

BLE_SEND_MAX_LEN是藍牙單次可處理最大字節長度

//分包發送藍牙數據
-(void)sendMsgWithSubPackage:(NSData*)msgData 
                  Peripheral:(CBPeripheral*)peripheral
              Characteristic:(CBCharacteristic*)character
{
    for (int i = 0; i < [msgData length]; i += BLE_SEND_MAX_LEN) {
        // 預加 最大包長度，如果依然小於總數據長度，可以取最大包數據大小
        if ((i + BLE_SEND_MAX_LEN) < [msgData length]) {
            NSString *rangeStr = [NSString stringWithFormat:@"%i,%i", i, BLE_SEND_MAX_LEN];
            NSData *subData = [msgData subdataWithRange:NSRangeFromString(rangeStr)];
            NSLog(@"%@",subData);
            [self writeCharacteristic:peripheral
                       characteristic:character
                                value:subData];
            //根據接收模塊的處理能力做相應延時
            usleep(20 * 1000);
        }
        else {
            NSString *rangeStr = [NSString stringWithFormat:@"%i,%i", i, (int)([msgData length] - i)];
            NSData *subData = [msgData subdataWithRange:NSRangeFromString(rangeStr)];
            [self writeCharacteristic:peripheral
                       characteristic:character
                                value:subData];
            usleep(20 * 1000);
        }
    }
}

轉載自：http://www.jianshu.com/p/29bd630077b4