L2SS-300: Allow annotation about the class of attribute the comms_annotation...

L2SS-261: Allow annotation about the class of attribute the comms_annotation is for. To distinguish attributes tied to different interfaces within the same device.

Closes L2SS-300

devices/clients/attribute_wrapper.py

@@ -14,11 +14,12 @@ class attribute_wrapper(attribute):
     Wraps all the attributes in a wrapper class to manage most of the redundant code behind the scenes
     """
 
-    def __init__(self, comms_annotation=None, datatype=None, dims=(1,), access=AttrWriteType.READ, init_value=None, **kwargs):
+    def __init__(self, comms_id=None, comms_annotation=None, datatype=None, dims=(1,), access=AttrWriteType.READ, init_value=None, **kwargs):
         """
         wraps around the tango Attribute class. Provides an easier interface for 1d or 2d arrays. Also provides a way to abstract
         managing the communications interface.
 
+        comms_id: user-supplied identifier that is attached to this object, to identify which communication class will need to be attached
         comms_annotation: data passed along to the attribute. can be given any form of data. handling is up to client implementation
         datatype: any numpy datatype
         dims: dimensions of the attribute as a tuple, or (1,) for a scalar.
@@ -31,6 +32,7 @@ class attribute_wrapper(attribute):
         if "numpy" not in str(datatype) and datatype != str:
             raise TypeError("Attribute needs to be a Tango-supported numpy or str type, but has type \"%s\"" % (datatype,))
 
+        self.comms_id = comms_id # store data that can be used to identify the comms interface to use. not used by the wrapper itself
         self.comms_annotation = comms_annotation  # store data that can be used by the comms interface. not used by the wrapper itself
         self.numpy_type = datatype  # tango changes our attribute to their representation (E.g numpy.int64 becomes "DevLong64")