I am using these two programs to communicate between two of my computers, one that I am ssh'd into and I am not returning anything on either side. It just runs without sending anything
client
import sys
from socket import socket, AF_INET, SOCK_DGRAM
SERVER_IP = '127.0.0.1'
PORT_NUMBER = 5000
SIZE = 1024
print ("Test client sending packets to IP {0}, via port {1}\n".format(SERVER_IP, PORT_NUMBER))
mySocket = socket( AF_INET, SOCK_DGRAM )
while True:
mySocket.sendto('cool',(SERVER_IP,PORT_NUMBER))
sys.exit()
server
from socket import socket, gethostbyname, AF_INET, SOCK_DGRAM
import sys
PORT_NUMBER = 5000
SIZE = 1024
hostName = gethostbyname( '0.0.0.0' )
mySocket = socket( AF_INET, SOCK_DGRAM )
mySocket.bind( (hostName, PORT_NUMBER) )
print ("Test server listening on port {0}\n".format(PORT_NUMBER))
while True:
(data,addr) = mySocket.recvfrom(SIZE)
print data
sys.ext()
What could I be doing wrong?
Socket programming is a way of connecting two nodes on a network to communicate with each other. One socket(node) listens on a particular port at an IP, while the other socket reaches out to the other to form a connection. The server forms the listener socket while the client reaches out to the server.
The problem is in the address of your client:
SERVER_IP = '127.0.0.1'
You are connecting to the local machine and sending data, while your server is sitting on a different ip. You need to connect to either the servers ip or hostname.
You can verify this by making the client connect first (and fail if it cant)
...
import time
mySocket = socket( AF_INET, SOCK_DGRAM )
mySocket.connect((SERVER_IP,PORT_NUMBER))
while True:
mySocket.send('cool')
time.sleep(.5)
Update from comments
Because you are on a wifi connection, that implies that both these machine are on the local network. You need to find the LAN ip address of the server, to specify it as the target.
Command-line approach to finding your IP
ifconfig
ipconfig /all
This program is used for sending "small letters string" from the client and getting "capital letters" from the server
import socket
def Main():
host = '192.168.0.12' #Server ip
port = 4000
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind((host, port))
print("Server Started")
while True:
data, addr = s.recvfrom(1024)
data = data.decode('utf-8')
print("Message from: " + str(addr))
print("From connected user: " + data)
data = data.upper()
print("Sending: " + data)
s.sendto(data.encode('utf-8'), addr)
c.close()
if __name__=='__main__':
Main()
import socket
def Main():
host='192.168.0.13' #client ip
port = 4005
server = ('192.168.0.12', 4000)
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind((host,port))
message = input("-> ")
while message !='q':
s.sendto(message.encode('utf-8'), server)
data, addr = s.recvfrom(1024)
data = data.decode('utf-8')
print("Received from server: " + data)
message = input("-> ")
s.close()
if __name__=='__main__':
Main()
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