diff --git a/python/fusion_engine_client/messages/configuration.py b/python/fusion_engine_client/messages/configuration.py
index 83976a1f..3addfe44 100644
--- a/python/fusion_engine_client/messages/configuration.py
+++ b/python/fusion_engine_client/messages/configuration.py
@@ -5,10 +5,12 @@
 from construct import (Struct, Padding, this, Flag, Bytes, Array,
                        Float32l, Float64l, Int64ul, Int32ul, Int16ul, Int8ul, Int64sl, Int32sl, Int16sl, Int8sl, PaddedString)
 
+from ..utils import trace as logging
 from ..utils.construct_utils import NamedTupleAdapter, AutoEnum, construct_message_to_string
 from ..utils.enum_utils import IntEnum
 from .defs import *
 
+_logger = logging.getLogger('point_one.fusion_engine.messages.configuration')
 
 ################################################################################
 # Device Configuration Support
@@ -1390,17 +1392,35 @@ def unpack(self, buffer: bytes, offset: int = 0, message_version: int = MessageP
             header_data = config_data[:_InterfaceConfigSubmessageConstruct.sizeof()]
             config_data = config_data[_InterfaceConfigSubmessageConstruct.sizeof():]
             interface_header = _InterfaceConfigSubmessageConstruct.parse(header_data)
-            subtype = interface_header.subtype
+            interface_config_subtype = interface_header.subtype
             self.interface = interface_header.interface
-            construct_obj = _conf_gen.INTERFACE_CONFIG_MAP[subtype]
+            construct_obj = _conf_gen.INTERFACE_CONFIG_MAP.get(interface_config_subtype, None)
+            if construct_obj is None:
+                _logger.warning(f'Unsupported interface config subtype. [interface={repr(self.interface)}, '
+                                f'subtype={interface_config_subtype}]')
         else:
             self.interface = None
-            construct_obj = _conf_gen.CONFIG_MAP[parsed.config_type]
+            interface_config_subtype = None
+            construct_obj = _conf_gen.CONFIG_MAP.get(parsed.config_type, None)
+            if construct_obj is None:
+                _logger.warning(f'Unsupported interface config type. [type={parsed.config_type}]')
 
-        if parsed.config_length_bytes > 0:
-            self.config_object = construct_obj.parse(config_data)
-        else:
+        if construct_obj is None:
             self.config_object = None
+        elif len(config_data) < construct_obj.sizeof():
+            if self.response != Response.OK and len(config_data) == 0:
+                # For a non-OK response, they device may omit the parameter altogether. This is normal.
+                pass
+            elif self.interface is None:
+                _logger.error(f'Config response payload too small for expected contents. [type={parsed.config_type}, '
+                              f'size={len(config_data)} B (expected={construct_obj.sizeof()} B)]')
+            else:
+                _logger.error(f'Config response payload too small for expected contents. '
+                              f'[interface={repr(self.interface)}, subtype={interface_config_subtype}, '
+                              f'size={len(config_data)} B (expected={construct_obj.sizeof()} B)]')
+            self.config_object = None
+        else:
+            self.config_object = construct_obj.parse(config_data)
 
         return parsed._io.tell()
 
diff --git a/src/point_one/fusion_engine/messages/configuration.h b/src/point_one/fusion_engine/messages/configuration.h
index 0dbb7715..a690ca8c 100644
--- a/src/point_one/fusion_engine/messages/configuration.h
+++ b/src/point_one/fusion_engine/messages/configuration.h
@@ -587,6 +587,10 @@ struct P1_ALIGNAS(4) SaveConfigMessage : public MessagePayload {
  * {MessageHeader, ConfigResponseMessage, uint32_t}
  * ```
  *
+ * The @ref response field will indicate the status of the requested value. If
+ * the response is not @ref Response::OK, the parameter value may be omitted and
+ * @ref config_length_bytes will be set to 0.
+ *
  * In response to a @ref GetConfigMessage with an invalid or unsupported @ref
  * ConfigType, @ref config_type in the resulting @ref ConfigResponseMessage will
  * be set to @ref ConfigType::INVALID, and @ref response will indicate the
@@ -1988,7 +1992,7 @@ struct P1_ALIGNAS(4) InterfaceID {
  * @brief @ref InterfaceID stream operator.
  * @ingroup io_interfaces
  */
-inline p1_ostream& operator<<(p1_ostream& stream, InterfaceID val) {
+inline p1_ostream& operator<<(p1_ostream& stream, const InterfaceID& val) {
   stream << "[type=" << val.type << ", index=" << (int)val.index << "]";
   return stream;
 }