Socket Connection between TCP client on a Windows PC (written in C/C++) and server in a ctrlX core

[andrhadi]

Good day everybody.

Just wondering whether anybody has succeeded in establishing TCP connection (socket) from a client (compiler: MS Visual Studio C++) to a server (ctrlX core with Go-Lang). 

To be frank I'm quite new in the Ubuntu World and all the restrictions for getting access to ctrlX from a Windows PC. I also installed Firewall-App in the core and open the port 10022 as inlet and outlet rule. But I didn't succeed getting any connection. On the client side, I get the (error?) message "SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.5 Invalid SSH Identification String"

Can anybody guide me how to do it properly? Or any link to documentation? Any info is appreciated...

Andri

[TheCodeCaptain · Accepted solution]

Hi andrhadi,

best would be if you start without the firewall app, with some wrong configuration it could restrict you.
Just delete your rules and disable the app.

For your app with a tcp server you have to use the corresponding plugs/slots so your app gets access to the network interface.

Check our go web server example.
ctrlx-automation-sdk/samples-go/hello.webserver at main · boschrexroth/ctrlx-automation-sdk (github....

At first, I would try it without any encryption, if possible.

[andrhadi]

Many thanks for your hints and info. It, indeed, works!