diff --git a/pyhon/commands.py b/pyhon/commands.py
index a305d78..68df63a 100644
--- a/pyhon/commands.py
+++ b/pyhon/commands.py
@@ -139,6 +139,8 @@ class HonCommand:
     async def send_parameters(self, params: Dict[str, str | float]) -> bool:
         ancillary_params = self.parameter_groups.get("ancillaryParameters", {})
         ancillary_params.pop("programRules", None)
+        if "prStr" in params:
+            params["prStr"] = self._category_name.upper()
         self.appliance.sync_command_to_params(self.name)
         try:
             result = await self.api.send_command(
diff --git a/pyhon/const.py b/pyhon/const.py
index 4f97435..8d1fd26 100644
--- a/pyhon/const.py
+++ b/pyhon/const.py
@@ -6,7 +6,7 @@ CLIENT_ID = (
     "3MVG9QDx8IX8nP5T2Ha8ofvlmjLZl5L_gvfbT9."
     "HJvpHGKoAS_dcMN8LYpTSYeVFCraUnV.2Ag1Ki7m4znVO6"
 )
-APP_VERSION = "2.1.2"
+APP_VERSION = "2.3.5"
 OS_VERSION = 31
 OS = "android"
 DEVICE_MODEL = "exynos9820"
diff --git a/pyhon/parameter/fixed.py b/pyhon/parameter/fixed.py
index 125ecd2..67a3056 100644
--- a/pyhon/parameter/fixed.py
+++ b/pyhon/parameter/fixed.py
@@ -18,7 +18,7 @@ class HonParameterFixed(HonParameter):
 
     @property
     def value(self) -> str | float:
-        return self._value if self._value is not None else "0"
+        return self._value if self._value != "" else "0"
 
     @value.setter
     def value(self, value: str | float) -> None:
diff --git a/setup.py b/setup.py
index 1d057f1..e12972d 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@ with open("README.md", "r", encoding="utf-8") as f:
 
 setup(
     name="pyhOn",
-    version="0.15.8",
+    version="0.15.9",
     author="Andre Basche",
     description="Control hOn devices with python",
     long_description=long_description,