w5100test1.py

def main():
    import network, socket
    from machine import Pin
    nic = network.WIZNET5K(pyb.SPI(2), Pin('PB12'), Pin('PC8'))
    addr = socket.getaddrinfo('towel.blinkenlights.nl', 23)[0][-1]
    s = socket.socket()
    s.connect(addr) 
    while True:
        data = s.recv(1500)
        print(data.decode('utf-8'), end='')

http://blog.boochow.com/article/454179047.html