L2SS-876: Get current RECV values before updating through antennafield

Closes L2SS-876

tangostationcontrol/tangostationcontrol/common/type_checking.py

+# -*- coding: utf-8 -*-
+#
+# Distributed under the terms of the APACHE license.
+# See LICENSE.txt for more info.
+
+from collections.abc import Sequence
+
+import numpy
+
+
+def is_sequence(obj):
+    """Identify sequences / collections"""
+    return isinstance(obj, Sequence) or isinstance(obj, numpy.ndarray)
+
+
+def sequence_not_str(obj):
+    """Separate sequences / collections from str, byte or bytearray"""
+    return is_sequence(obj) and not isinstance(obj, (str, bytes, bytearray))
+
+
+def type_not_sequence(obj):
+    """Separate sequences / collections from types"""
+    return not is_sequence(obj) and isinstance(obj, type)