I assume that you have a basic understanding of XMPP and the the concept of a XMPP component / transport. If not, please get a book about Jabber or read the standards.
transWhat is a XMPP transport. By this means it extends the functionallity of an existing XMPP server. It acts as a gateway between the XMPP and WhatsApp networks. It receives WhatsApp messages and forwards them to your XMPP client (and vice-versa).
The implementation of transWhat is based on the [Spectrum 2](http://www.spectrum.im) framework and the [Yowsup 2](https://github.com/tgalal/yowsup) library to interface with WhatsApp.
The following chart summarizes the involved components and the protocols they use to communicate.
## Prosody
### Installation
I will not cover the installation of Prosody in this guide. Please look for some other tutorials on how to do that.
### Configuration
The only important thing for us is the configuration of a XMPP component (Spectrum 2 in our case).
See http://prosody.im/doc/components.
Append the following at the end of `/etc/prosody/prosody.cfg.lua`
Component "whatsapp.0l.de"
component_secret = "whatsappsucks"
component_ports = { 5221 }
component_interface = "127.0.0.1"
## Spectrum 2
#### Installation
Manual compile latest version from [Github](https://github.com/hanzz/libtransport).
You can use the following guide: http://spectrum.im/documentation/installation/from_source_code.html.
#### Configuration
Create a new file `/etc/spectrum2/transports/whatsapp.cfg` with the following content: