For this meeting each participant can bring any material that enables to create his or her own node. There is a list of regular materials that you can check here: http://madrid.guifi.net/docs.
Soon we will be adding more information about guifi.net network and website.
What is Guifi.net Madrid?
Guifi.net Madrid is a local group of Guifi.net, the new communications net where you can access contents and services for free, allowing everyone to be able to connect to it: therefore, guifi.net is a free, open and neutral net.