全志Tina平台BLE 数据传输失败问题

public static int packageSize = 20;

//将字符串拆分成若干个比特list
public static List<byte[]> split(String str){
    byte[] bytes = str.getBytes();
    List<byte[]> byteList = new ArrayList<>();
    int packCount = bytes.length/packageSize;
    int lastPackSize = bytes.length%packageSize;//最后一个包的大小
    if(lastPackSize>0){
        packCount++;
    }else{
        lastPackSize = packageSize;
    }
    for(int i=0;i<packCount;i++){
        byte[] bb;
        if(i<packCount-1){//前面的包
            bb = new byte[packageSize];
        }else{//最后的一个包
            bb = new byte[lastPackSize];
        }
        int bblength = bb.length;
        for(int j=0;j<bblength;j++){
            bb[j] = bytes[i*packageSize+j];
        }
        byteList.add(bb);
    }
    return byteList;
}