Dear All .. A year ago, I need send some defined message to a jabber conference. The message content will depend on a "button-press". My trick is to use ttyctrl (http://ttyctrl.sourceforge.net/). So basicaly my "system" is builded from several parts: 1. TTYCTRL : I made some small python XMLRPC client script, that will send a msg to my local twisted server 2. Twisted server, contain : a. an XMLRPC server b. XMPP Client ... use to send msg to remote jabber conference room I made a pastebin of that twisted script at : http://pastebin.com/iSRVZNwS With that script the flow alway one-way only : serial====>Twisted_XMLRPC--->Twisted_XMPP=====>Jaber Now I need to do something different, since it's hard to find a Board with RS232 onboard. I Need to replace TTYCTRL with Arduino MCU. Arduino will Send serial data to my PC. So I'll need my twisted to able to receive data via serial There will also incoming XMPP msg from Jabber that will need to be send to arduino via Serial port. so the flow will be like : serial<====>Twisted_Serial<--->Twisted_XMPP<=====>Jaber My question is, How to make : 1. twisted.internet.serial to send data via an instance of XMPP client ? and 2. my EchobotProtocol.onMessage (see pastebin), to write data to the same serial port used by Point#1 above. Sincerely -bino-