I currently use PHRETS to query/download information from the RMLS's RETS server. I've tried a few different configs and haven't been able to get it to work. I also don't know if PHRETS can already do what I want?
I was wondering if there's a similar script or library for connecting to the NWMLS IDX server? A PHP script/library would be preferred.
I know this is a late answer but maybe it'll help somebody later.
Here's a link to a list of RETS clients "supported" by RESO the Standards Organization for Real Estate.
Not on this list but for PHP there's also VieleRETS