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How to use run_for_n_seconds method in lisa

Best Python code snippet using lisa_python

UDPRedPitayaDiscovery.py

Source:UDPRedPitayaDiscovery.py

1# -*- coding: utf-8 -*-2"""3Created on Thu Dec 17 17:54:31 20154@author: JD5"""6from __future__ import print_function7# Simple service discovery implementation based on UDP broadcast packets:8# This class sends a UDP broadcast packet on port 1952 and then listens for replies on port 1952+1.9# Those replies do not contain useful data, other than the sender's IP addresses10import socket11import select12import time13class UDPRedPitayaDiscovery():14    15    #def __init__(self, broadcast_address="255.255.255.255", port_number=1952):16    def __init__(self, broadcast_address="192.168.1.255", port_number=1952):17        self.port_number = port_number18        self.broadcast_address = broadcast_address19        self.sock_conn = None20        self.sock_server = None21        22        self.bVerbose = False23        24        self.startListening()25        26    def __del__(self):27        # print("UDPRedPitayaDiscovery::__del__()")28        pass29        30    def startListening(self):31        # Initialization:32        print('Creating client socket...')33        self.sock_client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)34        self.sock_client.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)35        self.connectClientSocket()36        37        print('Creating server socket...')38        HOST_LOCALHOST = ''       # means local host39        self.sock_server = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)40        self.sock_server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)41        self.sock_server.setblocking(0)42        self.sock_server.bind((HOST_LOCALHOST, self.port_number+1))43        # no need to call listen() since this is UDP44        45    def connectClientSocket(self):46        self.sock_client.connect((self.broadcast_address, self.port_number))47    def send_broadcast(self):48        # send a broadcast packet:49        self.sock_client.send(b"")50        pass51        52    def check_answers(self):53        # is there any data ?54        # note the [0] at the end which selects only the first output of the select()55        ready_to_read = select.select([self.sock_server], [], [], 0)[0]56        57        if ready_to_read:58            (mac_address_data, host_info) = self.sock_server.recvfrom(4096)59            mac_address_data = mac_address_data.decode('ascii') # received data is in bytes format and we handle the mac address as an ascii string internally60            # we don't care about the data, we are only looking for the IP addresses61            return (host_info[0], mac_address_data)62        else:63            return (None, None)64    def run_for_N_seconds(self, Timeout=1):65        if self.bVerbose:66            print('run()')67            68        # send a broadcast packet:69        self.send_broadcast()70        71        # then we check for answers:72        start_time = time.perf_counter()73        ElapsedTime = 074        while ElapsedTime < Timeout:75            76            (host, mac_address) = self.check_answers()77#            if not host is None:78            print((host, mac_address))79            80            time.sleep(0.1)81            ElapsedTime = time.perf_counter() - start_time82            83            84def main():85#    disc = UDPRedPitayaDiscovery("192.168.137.255")86    disc = UDPRedPitayaDiscovery("192.168.2.255")87    disc.run_for_N_seconds(10)88#    disc.send_broadcast()89#    time.sleep(0.1)90#    print(disc.check_answers())91#    while 1:92#        time.sleep(1)93#        print(disc.check_answers())94#    95    96if __name__ == "__main__":...

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