For others, the server field expects a server identifier as either an IP address or a hostname. There is no support for url encoded authentication via the server field. As the above post points out, supplying “<username>:password@<IP Address>” into this field causes OpenSprinkler to look for a device named exactly that on the network and fails.
The “man-in-the-middle” approach suggested above is a good workaround where authentication is needed but requires an available web server. For those using OSPi, you can install the apache server onto your existing OSPi raspberry pi to leverage this option without needing additional hardware. Not the ideal but a way forward…