reworking messages

1) start 'bin/secop-server test'
2) connect to localhost port 10767
3) enter help<enter>
4) enjoy

Change-Id: I488d5f9cdca8c91c583691ab23f541a4a8759f4e

secop/devices/test.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python
+#  -*- coding: utf-8 -*-
+# *****************************************************************************
+# 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
+#
+# Module authors:
+#   Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
+# *****************************************************************************
+
+"""testing devices"""
+
+import random
+
+from secop.devices.core import Readable, Driveable, PARAM
+from secop.validators import floatrange
+
+
+class LN2(Readable):
+    """Just a readable.
+
+    class name indicates it to be a sensor for LN2,
+    but the implementation may do anything
+    """
+
+    def read_value(self, maxage=0):
+        return round(100 * random.random(), 1)
+
+
+class Heater(Driveable):
+    """Just a driveable.
+
+    class name indicates it to be some heating element,
+    but the implementation may do anything
+    """
+    PARAMS = {
+        'maxheaterpower': PARAM('maximum allowed heater power',
+                                validator=floatrange(0, 100), unit='W'),
+    }
+
+    def read_value(self, maxage=0):
+        return round(100 * random.random(), 1)
+
+    def write_target(self, target):
+        pass
+
+
+class Temp(Driveable):
+    """Just a driveable.
+
+    class name indicates it to be some temperature controller,
+    but the implementation may do anything
+    """
+    PARAMS = {
+        'sensor': PARAM("Sensor number or calibration id",
+                        validator=str, readonly=True),
+    }
+
+    def read_value(self, maxage=0):
+        return round(100 * random.random(), 1)
+
+    def write_target(self, target):
+        pass