pfeifferRS485: Fix exception message

pfeifferRS485.py

@@ -77,7 +77,7 @@ class Type(enum.Enum):
 
     def decode(self, data):
         if len(data) != self.length:
-            raise ValueError(f'unepxtected data lenght for type {self.datatype}: {value!r}')
+            raise ValueError(f'unepxtected data lenght for type {self.datatype}: {data!r}')
         return self.func(data)