circuitpython/tests/multi_net/udp_data.py

# Simple test of a UDP server and client transferring data

import socket

NUM_NEW_SOCKETS = 4
NUM_TRANSFERS = 10
TOTAL_PACKETS = NUM_NEW_SOCKETS * NUM_TRANSFERS
# If more than 75% of packets are lost, the test fails.
PACKET_LOSS_THRESH = 0.75 * TOTAL_PACKETS
PORT = 8000


def print_stats(seq):
    if (TOTAL_PACKETS - seq) > PACKET_LOSS_THRESH:
        print(
            "packet loss %.1f%% %d/%d"
            % (((TOTAL_PACKETS - seq) / TOTAL_PACKETS * 100), seq, TOTAL_PACKETS)
        )
    else:
        print("pass")


# Server
def instance0():
    seq = 0
    multitest.globals(IP=multitest.get_network_ip())
    multitest.next()
    for i in range(NUM_NEW_SOCKETS):
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        s.bind(socket.getaddrinfo("0.0.0.0", PORT + i)[0][-1])
        s.settimeout(0.250)
        multitest.broadcast("server ready")
        for j in range(NUM_TRANSFERS):
            try:
                data, addr = s.recvfrom(1000)
            except:
                continue
            if int(data) == seq:
                if seq < (TOTAL_PACKETS - PACKET_LOSS_THRESH):
                    print(seq)
                seq += 1
                s.sendto(b"%d" % (seq), addr)
        s.close()

    print_stats(seq)


# Client
def instance1():
    seq = 0
    multitest.next()
    for i in range(NUM_NEW_SOCKETS):
        ai = socket.getaddrinfo(IP, PORT + i)[0][-1]
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.settimeout(0.250)
        multitest.wait("server ready")
        for j in range(NUM_TRANSFERS):
            s.sendto(b"%d" % (seq), ai)
            try:
                data, addr = s.recvfrom(1000)
            except:
                continue
            if int(data) == seq + 1:
                if seq < (TOTAL_PACKETS - PACKET_LOSS_THRESH):
                    print(seq)
                seq += 1
        s.close()

    print_stats(seq)