I’ve got 2 PCS of eBUS adaptor shield V5 that are surplus to requirement. These can be used to read data from Vaillant heat pumps
I paid 37 EUR + VAT for each of them. Happy to sell them for £20 + VAT including shipping. If you’re interested, please purchase 20 x custom payment units from the shop and leave a comment that you want an eBUS adaptor.
Documention & setup guide: Willkommen zum eBUS Adapter Shield - eBUS Adapter Shield v5