add T forwarder for razorbill

cfg/addons/temp_fwd_cfg.py

@@ -0,0 +1,34 @@
+Node('cfg/stick/razorbill.cfg',
+     'razorbill stick',
+)
+
+Mod('sea_stick',
+    'frappy_psi.sea.SeaClient',
+    'SEA stick connection',
+    config='razorbill.stick',
+    service='stick',
+)
+
+Mod('ts',
+    'frappy_psi.sea.SeaReadable', '',
+    io='sea_stick',
+    sea_object='tt',
+    json_file='ori6.config.json',
+    rel_paths=['ts'],
+)
+
+
+Mod('T_remote',
+    'frappy.proxy.Proxy',
+    'dummy (remote) T',
+    remote_class = 'frappy_psi.dummy.Temp',
+    uri='razorbill:5000',
+    module='T',
+    export=False,
+)
+
+Mod('forwarder',
+    'frappy_psi.dummy.Forwarder',
+    'forwarder',
+    src='ts',
+    dst='T_remote')

frappy_psi/dummy.py

@@ -0,0 +1,44 @@
+# *****************************************************************************
+# 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:
+#   Paul M. Neves <pmneves@mit.edu>
+# *****************************************************************************
+
+from frappy.core import Readable, Parameter, FloatRange, Module, Attached, Writable
+
+
+class Temp(Writable):
+    """a voltage output with loop"""
+
+    value = Parameter(unit='K', value=0)
+    target = Parameter('target voltage', FloatRange(0, 325, unit='K'),
+                       readonly=False)
+
+    def write_target(self, target):
+        self.value = target
+
+
+class Forwarder(Module):
+    """forward the values of a module to the target of another module"""
+    src = Attached(Readable, 'source module')
+    dst = Attached(Writable, 'destination module')
+
+    def initModule(self):
+        super().initModule()
+        self.src.registerCallbacks(self)
+
+    def update_value(self, value):
+        self.dst.write_target(value)