so the question is: is there anything alike for the N7650? Or can we assume that if something works with the 7210, it will probably work with the 7650 too?
Any advice is very appreciated, because in this condition is pretty impossible to do anything useful.
Even if what you say was true, it wouldn't be nice by Nokia not to provide tools for easily develop applications for thier phones. There is no way you can get out from a situation where you do not get any feedback and you do not have a term of paragon. No specs tell you that server capabilities must be encoded in the WBXML message as an opaque embedded complete WBXML stream.... You have to discover it by yourself or pay a lot of money for the interoperability test toolkit....
This is very bad by Nokia and the other phone manifactures. At the end, what I would ask is something they already have for the 7210. It should not be a big problem to do something similar for the 7650.