weather station
the QUdpSocket class provides a UDP socket.
UDP (User Datagram Protocol) is a lightweight, unreliable, datagram-oriented, connectionless protocol. It can be
//用戶數據協議是一個輕量，不可靠，數據報式的 ,無連接的協議
used when reliability isn’t important. QUdpSocket is a subclass of QAbstractSocket that allows you to send and receive UDP datagrams.
//當連接是不重要時可以使用，QUdpSocket是QAbstractSocket的子類，允許發送和接收udp數據報
bool QUdpSocket::bind(const QHostAddress & address, quint16 port)
Binds this socket to the address address and the port port. When bound, the signal readyRead()
//綁定socket到地址和端口，綁定時，當udp數據報到指定地址和端口時，信號readyRead發射，
is emitted whenever a UDP datagram arrives on the specified address and port. This function is useful to write UDP servers.
bool QUdpSocket::hasPendingDatagrams() const
Returns true if at least one datagram is waiting to be read; otherwise returns false.
//當至少有一個數據報在等待讀時 會返回真，否則返回錯誤
weather ballon
qint64 QUdpSocket::writeDatagram(const char * data, qint64 size, const QHostAddress & address, quint16 port)
Sends the datagram at data of size size to the host address address at port port. Returns the number of bytes sent on success;
//在port發送指定大小的數據報到host，返回成功發送的字節數
otherwise returns -1.