2.4 Write a stream –based echo server and a client sending message to it, and receiving back
each message in turn until the client terminates the connection. Hint: Modify the stream-based
TCP client and server programs in this chapter or similar programs to transfer multiple messages
back and forth.
Solution
The Transmission Control Protocol (TCP) is a stream-based method of network communication.
And one of the main protocol of Internet Protocol suite.
TCP provides an interface to network communications that is radically different from the USER
datagram Protocol(UDP).
The properties of TCP make it highly attractive to network programmers and it simplifies
network communication by removing many of the obstacles of UDP, such as ordering of packets
and packet loss.
TCP focuses instead on establishing a network connection, through which a stream of bytes may
be sent and received.
It establishes a \"virtual connection\" between two machines, through which stream of data may
be sent.
TCP uses a lowel-level communications protocol, the internet protocol to establish the
connection between machines.This connection provides an interface that allows stream of bytes
to be sent and received and to convert the data into IP datagram packets.
Simple Echo Server Program:
import socket
host = \' \'
port = 5000
backlog = 1024
s = socket.socket(socket.AF-INET, socket.SOCK-STREAM)
s.bind ((host,port))
s.listen(backlog)
while 1:
client, address = s. accept()
data = client.recv(size)
if data;
client.send(data)
client.close()
TCP ECHO CLIENT USING STREAMS:
import asyncio
@asyncio.coroutine
def tcp-echo-client(message, loop);
reader, writer = yield from asyncio.open-connection(loop = loop)
printf(\"send:% message)
writer.write(message.encode())
data = yield from reader.read(100)
print(\'received: %r\' %data.decode())
print(\'close the socket\')
writer.close()
message = \'Hello World\'
loop = asyncio.get-event-loop()
loop.run-until-complete-echo-client(message,loop)
loop.close().
2.4 Write a stream –based echo server and a client sending message t.pdf
1. 2.4 Write a stream –based echo server and a client sending message to it, and receiving back
each message in turn until the client terminates the connection. Hint: Modify the stream-based
TCP client and server programs in this chapter or similar programs to transfer multiple messages
back and forth.
Solution
The Transmission Control Protocol (TCP) is a stream-based method of network communication.
And one of the main protocol of Internet Protocol suite.
TCP provides an interface to network communications that is radically different from the USER
datagram Protocol(UDP).
The properties of TCP make it highly attractive to network programmers and it simplifies
network communication by removing many of the obstacles of UDP, such as ordering of packets
and packet loss.
TCP focuses instead on establishing a network connection, through which a stream of bytes may
be sent and received.
It establishes a "virtual connection" between two machines, through which stream of data may
be sent.
TCP uses a lowel-level communications protocol, the internet protocol to establish the
connection between machines.This connection provides an interface that allows stream of bytes
to be sent and received and to convert the data into IP datagram packets.
Simple Echo Server Program:
import socket
host = ' '
port = 5000
backlog = 1024
s = socket.socket(socket.AF-INET, socket.SOCK-STREAM)
s.bind ((host,port))
s.listen(backlog)
while 1:
client, address = s. accept()
data = client.recv(size)
if data;
client.send(data)
client.close()
2. TCP ECHO CLIENT USING STREAMS:
import asyncio
@asyncio.coroutine
def tcp-echo-client(message, loop);
reader, writer = yield from asyncio.open-connection(loop = loop)
printf("send:% message)
writer.write(message.encode())
data = yield from reader.read(100)
print('received: %r' %data.decode())
print('close the socket')
writer.close()
message = 'Hello World'
loop = asyncio.get-event-loop()
loop.run-until-complete-echo-client(message,loop)
loop.close()
