The datasheet mentions the use of their WNET firmware, however the direct link they provide to a pdf of the users manual is broker. After a little digging, I found a technical presentation which explains the firmware and gives some example code for various uses. It may be moderately useful, at least in knowing what to expect from the libraries once they can be found for this module. The presentation references the other EWM316x modules heavily.
The presentation can be found here:
Note: The link was very slow to load, but did eventually load the full document.