auf binarypayloaddecoder umgestellt

main.py

@@ -2,6 +2,9 @@ from pymodbus.client import ModbusTcpClient
 import struct
 import time
 
+from pymodbus.constants import Endian
+from pymodbus.payload import BinaryPayloadDecoder
+
 # Verbindung zur Wärmepumpe
 ip = '10.0.0.10'
 port = 502
@@ -31,11 +34,12 @@ try:
                 continue
 
             if reg_type == 'REAL':
-                reg_high = result.registers[0]
-                reg_low = result.registers[1]
-                # Oder falls dein Gerät Low-Word zuerst sendet:
-                decoder = struct.pack('>HH', reg_low, reg_high)
-                value = struct.unpack('>f', decoder)[0]
+                decoder = BinaryPayloadDecoder.fromRegisters(
+                    result.registers,
+                    byteorder=Endian.Big,
+                    wordorder=Endian.Little  # ← Das ist der Trick!
+                )
+                value = decoder.decode_32bit_float()
             else:
                 value = result.registers[0]