I’m pretty sure that was the case. IIRC the early versions of the Ethercard library had a static buffer. In fact for another project we chose UIPEthernet for its improved TCP/IP support. There are still some hangovers from the early days in the Ethercard code – the MSS of 512 octets in the client code as an example. Your project has finally given me the impetus to look into a bunch of stuff I’ve been meaning to get to for a long time.
I’m building an OpenSprinkler for my Mom to replace the Toro DDC-6 I gave her years ago because it’s a pain to program, runs the backup battery down and forgets the settings whenever there’s a power failure.
The OpenSprinkler is such a nice solution.