registers: decoding of ASCII values

Verified by a meter type ID of my new hot water meter; it matches the
laser print on the meter's face.

Author: jktjkt

src/pykmp/registers.py

@@ -65,6 +65,9 @@ def from_register_data(cls, reg: messages.RegisterData) -> Self:
                 value_str = f'{(2000 + reg.value[3]):02}-{reg.value[4]:02}-{reg.value[5]:02} ' \
                     + f'{reg.value[6]:02}:{reg.value[7]:02}:{reg.value[8]:02}' \
                     + f'{"+" if dst > 0 else "-"}{(dst // 60):02}:{(dst % 60):02}'
+            case 0x36:
+                # ASCII
+                value_str = bytes(reg.value[2:]).decode('ascii')
             case _:
                 value_dec = codec.FloatCodec.decode(reg.value)
         return cls(

tests/test_registers.py

@@ -68,6 +68,14 @@
             None,
             'DST YY-MM-DD hh:mm:ss',
         ),
+        pytest.param(
+            254,
+            54,
+            '0C 00 30 32 4B 35 32 41 43 31 41 37 43 5A',
+            '02K52AC1A7CZ',
+            None,
+            'ASCII',
+        ),
     ]
 )
 def test_register_parsing(id_, unit, blob_with_size, value_str, value_dec, unit_str):