Add TCP bitflag checks to TC_SC_4_3 test. (project-chip#37347)

Author: pidarped

src/python_testing/TC_SC_4_3.py

@@ -145,6 +145,19 @@ def verify_t_value(self, t_value):
                 return True, f"T value ({t_value}) is valid and bit 0 is clear."
             else:
                 return False, f"Bit 0 is not clear. T value ({t_value})"
+
+            # Check that the value can be either 2, 4 or 6 depending on whether
+            # DUT is a TCPClient, TCPServer or both.
+            if self.check_pics("MCORE.SC.TCP"):
+                if (T_int & 0x04 != 0):
+                    return True, f"T value ({t_value}) represents valid TCP support info."
+                else:
+                    return False, f"T value ({t_value}) does not have TCP bits set even though the MCORE.SC.TCP PICS indicates it is required."
+            else:
+                if (T_int & 0x04 != 0):
+                    return False, f"T value ({t_value}) has the TCP bits set even though the MCORE.SC.TCP PICS is not set."
+                else:
+                    return True, f"T value ({t_value}) is valid."
         except ValueError:
             return False, f"T value ({t_value}) is not a valid integer"