How to do Network discovery using UDP Broadcast C#?

Computer networks udp connection problem?

• hi, i have a problem: Write an UDP broadcast application that serves as client and server in the same time. The application is started with the network broadcast address <NBCAST> as argument in the command line. Upon launching the application listens on UDP port 7777. Every 3 seconds the application sends a UDP broadcast message to NBCAST port 7777 with the format: TIMEQUERY\0 (string) Whenever the application receives a TIMEQUERY demand it answers to the source IP:port with a string message: TIME HH:MM:SS\0 (current time) using unicast. Every 10 seconds the application sends a UDP broadcast message to NBCAST port 7777 with the format: DATEQUERY\0 (string) Whenever the application receives a DATEQUERY demand it answers to the source IP:port with a string message: DATE DD:MM:YYYY\0 (current date) using unicast. The application will keep a list of peers (that answer to broadcast – IP:portno) and update the information anytime a unicast message is received upon a broadcast. When an entry in a list does not have any answer for 3 consecutive broadcasts it will be removed from the list. The list will be displayed (ip,date, time) on the screen upon each update (using a screen positioning api like conio or by erasing the screen before each update). Every malformed request/response received will be counted and displayed at the end of a screen update. now i know how to send the TIMEQUERY and DATEQUERY but i dont know how to receive and send abreast.should i use threads for that? because the recvfrom (which is the only one i could use to keep in list whereof i get a message) waits until it receives something and i cant continue sending.or are there more methods to solve my problem? thanks in advance.

• Answer:

  Refresh the connection... Good luck!