How to create Topology connection using Siemens TIA Openness & Python?

I am trying to automate the hardware configuration in TIA Portal V17 with the help of Python & TIA Openness API. I have created a subnet & connected all the network interfaces to the subnet as shown below:

#creating a list of all found network interfaces on all stations in the station list
n_interfaces = []
for device in myproject.Devices:
    device_item_aggregation = device.DeviceItems[1].DeviceItems
    for deviceitem in device_item_aggregation:
        network_service = tia.IEngineeringServiceProvider(deviceitem).GetService[hwf.NetworkInterface]()
        if type(network_service) is hwf.NetworkInterface:
            n_interfaces.append(network_service)
# Creating subnet and IO system on the first item in the list
# Connects to subnet for remaining devices, if IO device it gets assigned to the IO system
for n in n_interfaces:
    if n_interfaces.index(n) == 0:
        subnet = n_interfaces[0].Nodes[0].CreateAndConnectToSubnet("Profinet")
        ioSystem = n_interfaces[0].IoControllers[0].CreateIoSystem("PNIO");
    else:
        n_interfaces[n_interfaces.index(n)].Nodes[0].ConnectToSubnet(subnet)
        if (n_interfaces[n_interfaces.index(n)].IoConnectors.Count) >> 0:
            n_interfaces[n_interfaces.index(n)].IoConnectors[0].ConnectToIoSystem(ioSystem);

Could anyone say how to achieve port to port connections (under Topology view)?

Thanks in advance.

Regards,
Mukara

We are searching for networkports within the wrong list. We have to get one stage deeper to find a list with networkports. (see picture below)

It should be:

n_NetworkPorts = []
for device in myproject.Devices:
    device_item_aggregation = device.DeviceItems[1].DeviceItems
    for device in device_item_aggregation:
        DeviceItems = device.DeviceItems
        for deviceitem in DeviceItems:
            networkPort = tia.IEngineeringServiceProvider(deviceitem).GetService[hwf.NetworkPort]()
            if type(networkPort) is hwf.NetworkPort:
                n_NetworkPorts.append(networkPort)

n_NetworkPorts[0].ConnectToPort(n_NetworkPorts[3]);

You have to query all NetworkPort that you have available in your devices:

The following line in from the c# documentation, i have implemented it before in that language.

 ((IEngineeringServiceProvider)deviceItem).GetService<NetworkPort>();

Anyway comparing your code and the c# documentation i conclude you can implement the following code in Python, please take note that is almost the same implementation you performed but with a different service hwf.NetworkPort

n_NetworkPorts = []
for device in myproject.Devices:
    device_item_aggregation = device.DeviceItems[1].DeviceItems
    for deviceitem in device_item_aggregation:
        networkPort = tia.IEngineeringServiceProvider(deviceitem).GetService[hwf.NetworkPort]()
        if type(networkPort) is hwf.NetworkPort:
            n_NetworkPorts.append(networkPort)

With the same logic you can find all NetworkPort available, and after that you can extend the logic to connect them:

 # You can connect your network ports like this and it will be shown in the Topology
 n_NetworkPorts[0].ConnectToPort(n_NetworkPorts[1]);

Unfortunately i can not test it in python but with c# this code idea is definetily working