fix set_message_fields for numpy array

Signed-off-by: Dirk Thomas <dirk-thomas@users.noreply.github.com>

rosidl_runtime_py/rosidl_runtime_py/set_message.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import array
+import numpy
 
 from typing import Any
 from typing import Dict
@@ -38,6 +39,8 @@ def set_message_fields(msg: Any, values: Dict[str, str]) -> None:
         field_type = type(field)
         if field_type is array.array:
             value = field_type(field.typecode, field_value)
+        elif field_type is numpy.ndarray:
+            value = numpy.array(field_value, dtype=field.dtype)
         elif type(field_value) is field_type:
             value = field_value
         else: