Open Source FIX Client Simulator

There is an alternative GUI tool that allows to simulate both client and server. It is called MINI FIX. One can construct messages as he/she sees or use code to talk to it and get respective response. The only downside is that it is Windows only.

QuickFIX can be used to send standard-compliant messages (with different safety-levels//use strong safety:-) to FIX servers/gateways.

quickfix has nice sample code on its site: http://www.quickfixengine.org/quickfix/doc/html/sending_messages.html

QuickFIXengine code comes with couple of examples, see http://www.quickfixengine.org/quickfix/doc/html/examples.html

You probably want tradeclient for sending messages. It is a command line tool that will send FIX messages to server.

You can use the ordermatch example to start up simple FIX server which will cross orders and send ExecutionReports back to your client.

For all example applications you need to provide a config file to startup up. Just follow the instructions at quickfixengine web site, see example config file. Your client will be initiator and server acceptor.

I've been using those example apps heavily for testing especially the ordermatcher, I've updated mine to handle amend orders and separates stock/futures/options symbols and so on.

The tradeclient uses screen logger so you should see all the outgoing and incoming messages on the command line.