#!/usr/bin/env python


#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
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## This file is part of the examples of PyQt.
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#############################################################################


from PyQt5.QtWidgets import (QApplication, QDialog, QHBoxLayout, QLabel,
        QPushButton, QVBoxLayout)
from PyQt5.QtNetwork import QUdpSocket


class Receiver(QDialog):
    def __init__(self, parent=None):
        super(Receiver, self).__init__(parent)

        self.statusLabel = QLabel("Listening for broadcasted messages")
        quitButton = QPushButton("&Quit")

        self.udpSocket = QUdpSocket(self)
        self.udpSocket.bind(45454)

        self.udpSocket.readyRead.connect(self.processPendingDatagrams)
        quitButton.clicked.connect(self.close)

        buttonLayout = QHBoxLayout()
        buttonLayout.addStretch(1)
        buttonLayout.addWidget(quitButton)
        buttonLayout.addStretch(1)

        mainLayout = QVBoxLayout()
        mainLayout.addWidget(self.statusLabel)
        mainLayout.addLayout(buttonLayout)
        self.setLayout(mainLayout)

        self.setWindowTitle("Broadcast Receiver")

    def processPendingDatagrams(self):
        while self.udpSocket.hasPendingDatagrams():
            datagram, host, port = self.udpSocket.readDatagram(self.udpSocket.pendingDatagramSize())

            try:
                # Python v3.
                datagram = str(datagram, encoding='ascii')
            except TypeError:
                # Python v2.
                pass

            self.statusLabel.setText("Received datagram: \"%s\"" % datagram)


if __name__ == '__main__':

    import sys

    app = QApplication(sys.argv)
    receiver = Receiver()
    receiver.show()
    sys.exit(receiver.exec_())