Client to Server connections

Every time you play a online game, you are using a client to server connection. Your device is the client, and the game you are playing has servers up all around the world. The server uses the clients information, such as IP addresses, OS model, and other things to make a unique account for your online play.

Well, it’s pretty simple. The client is the person who is requesting something. Like how in a restaurant scenario, clients of the restaurant requests food, and services. This is the same thing as the technological viewpoint, where the client asks the server for information.

This means that the server is providing the service that the client is asking for, but does not give it out until it’s been requested.

There are 3 states of the client: Disconnected, Connecting, and Connected. The UDP server can only have 4 clients at a time, or else it will be full and not let anymore in. Back to the client. While the client is in the connecting state the client listens for connection denied and connection accepted packets from the server. Any other packets are ignored.

If the client receives connection accepted, it transitions to connected. If it receives connection denied, or after 5 seconds hasn’t received any response from the server, it transitions to disconnected.

Once the client hits connected it starts sending connection payload packets to the server. If no packets are received from the server in 5 seconds, the client times out and transitions to disconnected.

We are making an 8-ball game with Client-Server connections with the help of sockets.

Here is some of the commands for sockets:

1) Primarily, the server must create a socket object with this line of code:

2) Next, you need to bind an IP address and port number to the socket object with:

s.bind(HOST, PORT)

HOST is a targeted IP address, and PORT is the port of choice to be accessed for the to-be-established connection.

3) Thereon, you must further prepare by incorporating the command to listen for connections:

s.listen(#)

The # represents the number of queued connections to the server machine. Obviously, this number should be greater than 1.

4) When the previous command detects an available connection, the server machine has to accept it with this code:

conn, addr = s.accept()

Conn represents the connection path, and addr is the ip address of the connected end.

5)To close off your code, use:

s.close()

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