From 5bd026b4cc6bbaac4c5a551e775d18c9853db131 Mon Sep 17 00:00:00 2001
From: Greig Sheridan <greiginsydney@users.noreply.github.com>
Date: Sun, 19 Jan 2025 21:03:56 +1100
Subject: [PATCH] Added DPT 29 (INT64) (#7)

---
 knxdclient/encoding.py  |  7 +++++++
 test/test_conversion.py | 12 ++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/knxdclient/encoding.py b/knxdclient/encoding.py
index fa9cf6c..94d2b3a 100644
--- a/knxdclient/encoding.py
+++ b/knxdclient/encoding.py
@@ -47,6 +47,7 @@ class KNXDPT(enum.Enum):
     DATE_TIME = 19
     ENUM8 = 20
     VARSTRING = 24
+    INT64 = 29
     COLOUR_RGB = 232
 
 
@@ -82,6 +83,7 @@ def from_datetime(cls, value: datetime.datetime):
     KNXDPT.DATE_TIME: bytes,
     KNXDPT.ENUM8: bytes,
     KNXDPT.VARSTRING: bytes,
+    KNXDPT.INT64: bytes,
     KNXDPT.COLOUR_RGB: bytes,
 }
 
@@ -106,6 +108,7 @@ def from_datetime(cls, value: datetime.datetime):
     KNXDPT.DATE_TIME: (datetime.datetime, datetime.date, datetime.time),
     KNXDPT.ENUM8: (int, enum.Enum),
     KNXDPT.VARSTRING: str,
+    KNXDPT.INT64: int,
     KNXDPT.COLOUR_RGB: tuple,
 }
 
@@ -212,6 +215,8 @@ def encode_value(value: Any, t: KNXDPT) -> EncodedData:
         return bytes([val])
     elif t is KNXDPT.VARSTRING:
         return val.encode('iso-8859-1') + b'\0'
+    elif t is KNXDPT.INT64:
+        return struct.pack('>q', val)
     elif t is KNXDPT.COLOUR_RGB:
         if len(val) != 3:
             raise ValueError(f"KNX DPT 232 requires a three-byte tuple. Received {len(val)}")
@@ -280,6 +285,8 @@ def decode_value(value: EncodedData, t: KNXDPT) -> Any:
     elif t is KNXDPT.ENUM8:
         # The raw int val is returned. The User code must construct the correct Enum type if required.
         return val[0]
+    elif t is KNXDPT.INT64:
+        return struct.unpack('>q', val)[0]
     elif t is KNXDPT.COLOUR_RGB:
         return tuple(val)
     else:
diff --git a/test/test_conversion.py b/test/test_conversion.py
index 8bbb661..c6d67ac 100644
--- a/test/test_conversion.py
+++ b/test/test_conversion.py
@@ -271,6 +271,18 @@ class HAVCMode(enum.Enum):
         self.assertEqual(bytes([2]), knxdclient.encode_value(2, knxdclient.KNXDPT.ENUM8))
         self.assertEqual(2, knxdclient.decode_value(bytes([2]), knxdclient.KNXDPT.ENUM8))
 
+    def test_dpt29_conversion(self) -> None:
+        self.assertEqual(bytes([0xff, 0xff, 0xff, 0xff, 0xf8, 0xa4, 0x32, 0xeb]),
+                         knxdclient.encode_value(-123456789, knxdclient.KNXDPT.INT64))
+        self.assertEqual(bytes([0x00, 0x00, 0x00, 0x0b, 0xad, 0xc0, 0xff, 0xee]),
+                         knxdclient.encode_value(0xbadc0ffee, knxdclient.KNXDPT.INT64))
+        self.assertEqual(-123456789,
+                         knxdclient.decode_value(bytes([0xff, 0xff, 0xff, 0xff, 0xf8, 0xa4, 0x32, 0xeb]),
+                                                 knxdclient.KNXDPT.INT64))
+        self.assertEqual(0xbadc0ffee,
+                         knxdclient.decode_value(bytes([0x00, 0x00, 0x00, 0x0b, 0xad, 0xc0, 0xff, 0xee]),
+                                                 knxdclient.KNXDPT.INT64))
+
     def test_dpt232_conversion(self) -> None:
         self.assertEqual((0x12, 0x34, 0x56),
                          knxdclient.decode_value(