I currently have a Java based API that I wrote using the proprietary GXS Enterprise OTX (Onward Transmission Exchange) protocol.  It will allow you to create custom OTX bridges quickly and efficiently.  It is all my code, written cleanly from scratch.  I’ll be posting a demo here sometime soon.  The demo will be what is called an “echo bridge”, but first I need to obfuscate the code and do a couple other things.  If you are interested in this then send me an email using my online contact form.