"""
mbed SDK
Copyright (c) 2011-2013 ARM Limited
SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
from socket import socket, AF_INET, SOCK_DGRAM
import string, random
from time import time

from mbed_settings import CLIENT_ADDRESS

ECHO_PORT = 7

LEN_PACKET = 127
N_PACKETS = 5000
TOT_BITS = float(LEN_PACKET * N_PACKETS * 8) * 2
MEGA = float(1024 * 1024)
UPDATE_STEP = (N_PACKETS // 10)

class UDP_EchoClient(object):
    s = socket(AF_INET, SOCK_DGRAM)

    def __init__(self, host):
        self.host = host
        self.packet = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(LEN_PACKET))

    def __packet(self):
        # Comment out the checks when measuring the throughput
        # packet = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(LEN_PACKET))
        UDP_EchoClient.s.sendto(packet, (self.host, ECHO_PORT))
        data = UDP_EchoClient.s.recv(LEN_PACKET)
        # assert packet == data, "packet error:\n%s\n%s\n" % (packet, data)

    def test(self):
        start = time()
        for i in range(N_PACKETS):
            if (i % UPDATE_STEP) == 0: print('%.2f%%' % ((float(i)/float(N_PACKETS)) * 100.))
            self.__packet()
        t = time() - start
        print('Throughput: (%.2f)Mbits/s' % ((TOT_BITS / t)/MEGA))

while True:
    e = UDP_EchoClient(CLIENT_ADDRESS)
    e.test()