Hi Jan
thanks for this update. It solved something strange. A while ago i made it to connect my Kostal inverter via the new http binding which runs with a longer JSON string. I got all values into the items, they were visible. But the entries in the sitemap did not show any values, just empty space. Strange thing, havent had the time yet to look into it.
Now i downloaded your changed binding and immediately the values popped up in the sitemap.
Is the buffer size the only thing you changed compared to the M5 binding? I have a similar issue at another binding so it would be an idea to look into the same topics..