Ah, Ray’s post did make me remember something. When I originally loaded OSPI onto my Pi, I did not have an opensprinkler adapter board, I was trying to use the PI IO directly to control the relays on my separate relay board. At that time OSPI was not able to support this, it only worked with the opensprinkler board itself (as it’s logic was to use the IO pins on a sort of bitwise method that then controlled the opensprinkler board). As a result, I had to install SIP (developed by Dan-in-CA) from github. I stand open to correction but SIP was 1 of the front-end applications that ran on top of open sprinkler. That worked perfectly for me once I’d installed that along with the ‘relay board’ plugin.
If OSPI can now support GPIO control on the PI motherboard directly then that’s great !