TCP/IP: Shoutbox Server (tcpip_shoutbox_server)
Create a TCP server which receives text messages and displays them in the HMI.
There will be an incoming connection on the TCP port 12345 and consecutive text messages will be sent as lines of text.
At this stage of the training program we have no client application, so for testing purposes we will use the command-line tool "telnet".
Please, turn it on at Control Panel > Programs > Turn Windows features on or off > Telnet Client.
When the server is ready, we will open the Windows Command Prompt and issue the following command:
telnet localhost 12345
or if accessing the server from another computer:
telnet <ip-address> 12345
Then we will type consecutive text messages.
The server should accept the connection and then display received text messages in the HMI.
Use the TcpIp_Accept filter to accept the connection from a client. In the default configuration it will wait forever until the client is connected.
Labeling connections is explained in this article.
You can learn how to turn on sections here.
Make sure you have "telnet" command installed.
Create a TextBox control in the HMI and connect it with the outText output.
Add a TcpIp_Close filter in the FINALIZE section to close the connection in case the program gets to this point.
- TCP/IP Networking - Detailed information about using TCP/IP filters.