# sample tcp server in python that uses binary comm - match with clientskl.py

from socket import *
from struct import *   # for packing/unpacking
import sys

listenport = int(sys.argv[1])  # bind port

# create server socket, or "listening" socket:
sfd = socket(AF_INET,SOCK_STREAM)

# bind socket to host and port
sfd.bind(('0.0.0.0', listenport))
sfd.listen(16)   # set length of connection queue

# server loop:

connects = 0    # simple counter keeps track of 

while 1:
    # open communications socket
    (cfd,addr) = sfd.accept()
    print "connection from ip",addr[0],"port ",addr[1]
    x = 10  # number of bytes to send
    y = htonl(x)  # convert to network byte ordering
    s = pack("I",y)  # pack into string format
    cfd.send(s)  # send over socket
    buf = "abcdefghij"
    cfd.send(buf)  # send buffer (10 bytes)
    r = cfd.recv(8)  # read 8 bytes from socket
    print "received echo: ",r
    cfd.close()  # close socket, get ready for next connection
# server loop