Networking and servers • Re: Socket programming on rpi4 or rpi5

Code:

import socketclass socketServer:def __init__(self):# create an INET, STREAMing socket to listen on        self.serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)        self.serversocket.settimeout(1000)# you'll want to handle this better                # bind the socket to public host and port        self.serversocket.bind(("0.0.0.0", 1234))#1234 is the port used here, but whatever you like        #become a server socket, for 10 connections max        self.serversocket.listen(10)                  while 1:        # do something with that connection        (clientsocket, address) = self.serversocket.accept()        self.process(clientsocket, address)                def process(self, clientsocket, address):        # receive info from client        msgLen = 0        payload = ""                while 1:# you probably want to limit this so it doesn't block forever                chunk = clientsocket.recv(1024).decode("utf-8")                if chunk == "" or msgLen >= 1024:  # we're done... max 1024 bytes in this case                    break                else:                    payload = payload + chunk                    msgLen += len(chunk)                          # we now have info from the client        response = self.doSomething(payload)                # send response        clientsocket.sendall(response.encode("utf-8"))                clientsocket.close()                def doSomething(payload):        return "this is the response to the client"        if __name__ == "__main__":a = socketServer()# this will block

Code:

import socketdef talkToServer(message):# get a socket connection to the serverconnection = socket.socket(socket.AF_INET, socket.SOCK_STREAM)        connection.connect(("192.168.1.234", 1234))# IP address and port of the server                # send the message        connection.send(message.encode("utf-8"))        # shut down the send, so the server knows we're done talkingconnection.shutdown(socket.SHUT_WR)# get the response from the servermsgLen = 0        payload = ""                while 1:# you probably want to limit this so it doesn't block forever                chunk = clientsocket.recv(1024).decode("utf-8")                if chunk == "" or msgLen >= 1024:  # we're done... max 1024 bytes in this case                    break                else:                    payload = payload + chunk                    msgLen += len(chunk)connection.close()return payload, msgLenif __name__ == "__main__":response, msgLen = talkToServer("Hello Dolly!")print (response)