
Yes, you can create your own SmartServer Web pages using SOAP/XML to communicate to the SmartServer. Refer to the SmartServer Programmer's Reference Guide for more information.
i.LON SmartServer 2.0 Programmer's Guide
http://www.echelon.com/assets/bltb6e284de20b6f393/078-0347-01D_i.LON_SmartServer_2_Programmers_Reference.pdf