better dummy server for seaweb tests

- new config file dummy
- frappy_demo.test.Temp now creates WARN and ERROR status
  and may be disabled

Change-Id: Ibc7bb565f18c2c12cdc2a77bea1ee1bf1cc8bd41

frappy_demo/test.py

@@ -22,11 +22,13 @@
 
 import random
 
-from frappy.datatypes import FloatRange, StringType, ValueType, TupleOf, StructOf, ArrayOf
+from frappy.datatypes import FloatRange, StringType, ValueType, TupleOf, StructOf, ArrayOf, StatusType, BoolType
 from frappy.modules import Communicator, Drivable, Parameter, Property, Readable, Module, Attached
 from frappy.params import Command
 from frappy.dynamic import Pinata
 from frappy.errors import RangeError, HardwareError
+from frappy.core import IDLE, WARN, ERROR, DISABLED
+
 
 class Pin(Pinata):
     def scanModules(self):
@@ -105,13 +107,27 @@ class Temp(Drivable):
        readonly=False,
        unit='K',
     )
+    enabled = Parameter('enable', BoolType(), default=True, readonly=False)
+    status = Parameter(datatype=StatusType(Readable, 'DISABLED'))
+    _status = IDLE, ''
 
     def read_value(self):
-        return round(100 * random.random(), 1)
+        value = round(100 * random.random(), 1)
+        if value > 75:
+            self._status = ERROR, 'sensor break'
+        elif value > 50:
+            self._status = WARN, 'out of calibrated range'
+        else:
+            self._status = IDLE, ''
+        self.read_status()
+        return value
 
     def write_target(self, target):
         pass
 
+    def read_status(self):
+        return self._status if self.enabled else (DISABLED, 'disabled')
+
 
 class Lower(Communicator):
     """Communicator returning a lowercase version of the request"""