11. Networking

1. Review presentation Networking

   Practical exercise

2. If necessary, change value of static final int port = 7700 variable in TttNet.java class and value of port key in src/resources/appplication.properties configuration file to different number e.g. 7701
3. Investigate jtm.activity11 package

4. Run TttCli class in terminal, to see, how it works in terminal using standard input and output:

   java -cp target/classes/ jtm.activity11.TttCli

   and enter numbers of the cells.

5. Implement TttNet class to run it either as a server (if port is available), or client (if server is listening to the port)
6. When running as server is implemented:

   1. Run TttNet in one terminal:

      java -cp target/classes/ jtm.activity11.TttNet

   2. Check if server is listening, by runinng command in other terminal:

      ss -ntlp|grep 7700

   3. Check, how server part works with nc program as a client in other terminal:

      nc 127.0.1.1 7700

      and it should run in the same way as TttCli, with only difference,
      that data are sent through the network socket.

7. When client part is implemented for TttNet class, it in another terminal:

   java -cp target/classes/ jtm.activity11.TttNet

   it should work in the same way as TttCli, with only difference,
   that data are sent through the network socket.

8. If necessary, check all Java processes runnig by command:

   ps -efaw|grep java

9. If necessary, application can be killed with command:

   kill -9 pid
   wher pid is process id from the previous command

Extra exercises

• Extra 13. Multithreaded networking

Additional info (in Latvian)

• TCP/IP basics
• Basics about TCP and UDP protocols

• Datortīkli I
• Datortīkli II