-(void)sendMsgWithSubPackage:(NSData*)msgData Peripheral:(CBPeripheral*)peripheral Characteristic:(CBCharacteristic*)character { for (int i = 0; i < [msgData length]; i += BLE_SEND_MAX_LEN) { // 预加 最大包长度，如果依然小于总数据长度，可以取最大包数据大小 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]; //根据接收模块的处理能力做相应延时 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); } } }