How to use run_for_n_seconds method in lisa

Best Python code snippet using lisa_python

UDPRedPitayaDiscovery.py

Source:UDPRedPitayaDiscovery.py Github

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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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