UDP Overview:
UDP is the abbreviation of User Datagram Protocol. UDP makes use of Internet Protocol of the TCP/IP suit. In communications using UDP, a client program sends a message packet to a destination server wherein the destination server also runs on UDP.
Properties of UDP:
- The UDP does not provide guaranteed delivery of message packets. If for some issue in a network if a packet is lost it could be lost forever.
- Since there is no guarantee of assured delivery of messages, UDP is considered an unreliable protocol.
- The underlying mechanisms that implement UDP involve no connection-based communication. There is no streaming of data between a UDP server or and an UDP Client.
- An UDP client can send "n" number of distinct packets to an UDP server and it could also receive "n" number of distinct packets as replies from the UDP server.
- Since UDP is connectionless protocol the overhead involved in UDP is less compared to a connection based protocol like TCP.
Example: UDP Server using Python
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import socket
localIP = "127.0.0.1" localPort = 20001 bufferSize = 1024
msgFromServer = "Hello UDP Client" bytesToSend = str.encode(msgFromServer)
# Create a datagram socket UDPServerSocket = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)
# Bind to address and ip UDPServerSocket.bind((localIP, localPort))
print("UDP server up and listening")
# Listen for incoming datagrams while(True): bytesAddressPair = UDPServerSocket.recvfrom(bufferSize) message = bytesAddressPair[0] address = bytesAddressPair[1] clientMsg = "Message from Client:{}".format(message)
# Sending a reply to client UDPServerSocket.sendto(bytesToSend, address) |
Output:
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UDP server up and listening Message from Client:b"Hello UDP Server" Client IP Address:("127.0.0.1", 51696) |
Example: UDP Client using Python
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import socket
msgFromClient = "Hello UDP Server" bytesToSend = str.encode(msgFromClient) serverAddressPort = ("127.0.0.1", 20001) bufferSize = 1024
# Create a UDP socket at client side UDPClientSocket = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)
# Send to server using created UDP socket UDPClientSocket.sendto(bytesToSend, serverAddressPort)
msgFromServer = UDPClientSocket.recvfrom(bufferSize)
msg = "Message from Server {}".format(msgFromServer[0]) print(msg) |
Output:
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Message from Server b"Hello UDP Client" |