Support for cascaded inverters

[Kugelfang666]

Describe your feature request

I just received my installation with two Huawei 10KTL-M1 inverters and a Fusion Solar Wallbox. All items are updated to the newest firmware versions avaliable.

The Master inverter is connected to my local network via the Huawei Smart Dongle. Since I the Wallbox needs to read the SmartMeter via this interface, I cannot use it for this integration (one connection only, see #491)

I did not manage to have the Inverters join my home WiFi with their build in WiFi module for some reason. Hence, each of the two inverters is currently running their own AP. My home assistant is connected to the AP of the master inverter using WiFi. Wit this integration I'm able to connect and read the states of inverter 1, the smart meter and the battery. However, I do not see the cascaded inverter #2

It would be great if cascaded inverted would also be supported by this integration

Proper usage

• I confirm that this is not a bug report or support request
• I confirm that this feature request is within the stated scope of the integration

[wlcrs]

I cannot make the slave inverter magically appear as a cascaded inverter if it isn't exposed via the WiFi AP of the primary inverter.

3 possible solutions:

1. Use a modbus proxy to sit between the "Smart Dongle" on HA/Wallbox.
2. Reconfigure the AP of the second inverter so that it doesn't have a conflicting 192.168.200.1 IP-address anymore (I don't know the Huawei settings dialogs by hard, so not entirely sure if this is possible), and then connect HA to that inverters WiFi AP as well.
3. Use a dedicated router running OpenWRT and do some networking wizardry with VLANs, and port forwardings to prevent those two colliding IP-ranges from conflicting with each other.

I'll convert this issue to a discussion, as there is no work for me to be done here. I won't give any extra support on how to realise any of the proposed solutions, but I do hope that you document them in the discussion or on the Wiki for future users.