Feature Request: Get System ID during initial setup

[CalvinSchwartz]

For me the system id is already known as I already used vitoconnect. However for a new user it could be more accessible if OptoV would detect the System ID on it's own (which should be possible).

My workflow would be:

1. Connect OptoV to the ESP32 connected to the heating system
2. Request the System ID at address 0x00F8 (if I remember it correct) and give the response, the System ID to the user, as a HomeAssistant entity
3. Let the user create the database based on the system ID and upload it by changing the configuration

To integrate it in HomeAssistant one could ask the user during setup if the system ID is known and if he has a database file. If not, OptoV only connects to one address. Afterwards the user can change the configuration and upload the database file. Once a database file is uploaded OptoV runs as usual.

[gismo2004]

What it will do, it shows the system id that is needed for the extractor, but it will not finish the setup without DB. There is no real point in completing it with one channel added. Also it would require a new design of reconfiguration and such things. So that's why it shows the ID at first setup and offers the dB upload.