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+# mex - Messages exchange library. {{{
+#
+# Copyright (C) 2008 Nicolas Schodet
+#
+# APBTeam:
+# Web: http://apbteam.org/
+# Email: team AT apbteam DOT org
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+#
+# }}}
+"""mex - Messages exchange library."""
+
+IDLE = 0
+"""IDLE message, send by nodes to the hub to signal it had handled all
+messages. It can have an optionnal parameter: the date at which the node will
+not be idle anymore."""
+
+DATE = 1
+"""DATE message, send by the hub to the nodes to update the current date
+value."""
+
+REQ = 2
+"""REQ (request) message, send from a node to other nodes to request a
+response message."""
+
+RSP = 3
+"""RSP (response) message, response to a REQ message, only sent to the
+requesting node."""
+
+DEFAULT_ADDR = ('localhost', 2442)
+
+HEADER_FMT = '!HB'