diff --git a/custom_components/solarman/api.py b/custom_components/solarman/api.py
index caa8cef..22aa31c 100644
--- a/custom_components/solarman/api.py
+++ b/custom_components/solarman/api.py
@@ -55,7 +55,7 @@ async def load(self):
             self.device_info = await self.profile.resolve(self.get)
             _LOGGER.debug(self.device_info)
         except TimeoutError as e:
-            raise TimeoutError(f"[{self.config.serial}] Device setup timed out.") from e
+            raise TimeoutError(f"[{self.config.serial}] Device setup timed out") from e
         except BaseException as e:
             raise Exception(f"[{self.config.serial}] Device setup failed. [{format_exception(e)}]") from e
 
@@ -107,7 +107,7 @@ async def try_read_write(self, code, start, arg, message: str, incremental_wait:
             except Exception as e:
                 _LOGGER.debug(f"[{self.config.serial}] {message} failed, attempts left: {attempts_left}{'' if attempts_left > 0 else ', aborting.'} [{format_exception(e)}]")
 
-                await self.endpoint.discover()
+                await self.endpoint.discover(True)
 
                 if not self.modbus.auto_reconnect:
                     await self.modbus.disconnect()
diff --git a/custom_components/solarman/discovery.py b/custom_components/solarman/discovery.py
index de1837f..307451b 100644
--- a/custom_components/solarman/discovery.py
+++ b/custom_components/solarman/discovery.py
@@ -66,7 +66,7 @@ async def _discover_all(self) -> dict:
         async for item in self._discover([str(net.broadcast_address) for net in nets], True):
             yield item
 
-    async def discover(self):
+    async def discover(self, ping_only = False):
         _LOGGER.debug(f"discover")
 
         self._devices = {}
@@ -76,6 +76,8 @@ async def discover(self):
             self._devices = {item[0]: item[1] async for item in self._discover(self._ip)}
             if len(self._devices) > 0 and not self._serial in self._devices:
                 self._devices = {}
+            if ping_only:
+                return self._devices
 
         attempts_left = ACTION_ATTEMPTS
         while len(self._devices) == 0 and attempts_left > 0:
diff --git a/custom_components/solarman/provider.py b/custom_components/solarman/provider.py
index 9f9c50b..7c2fb13 100644
--- a/custom_components/solarman/provider.py
+++ b/custom_components/solarman/provider.py
@@ -88,8 +88,8 @@ def ipaddress(self):
         except AddressValueError:
             return IPv4Address(socket.gethostbyname(self.host))    
 
-    async def discover(self):
-        if self.ipaddress.is_private and (discover := await InverterDiscovery(self.hass, self.host, self.serial).discover()):
+    async def discover(self, ping_only = False):
+        if self.ipaddress.is_private and (discover := await InverterDiscovery(self.hass, self.host, self.serial).discover(ping_only)):
             if (device := discover.get(self.serial)) is not None:
                 self.host = device["ip"]
                 self.mac = device["mac"]
@@ -112,7 +112,7 @@ def auto(self) -> bool:
 
     @cached_property
     def attributes(self) -> str:
-        return {ATTR_[k]: int(self._additional_options.get(k, DEFAULT_[k])) for k in ATTR_}
+        return {ATTR_[k]: int(self._additional_options.get(k, DEFAULT_[k])) for k in ATTR_} | {kv[0]: kv[1] for v in value.split(';') if (kv := v.split('=', 1)) and len(kv) > 1} if (value := self._additional_options.get(CONF_CUSTOM, DEFAULT_[CONF_CUSTOM])) else {}
 
     async def resolve(self, request: Callable[[], Awaitable[None]] | None = None):
         _LOGGER.debug(f"Device autodetection is {"enabled" if self.auto and request else f"disabled. Selected profile: {self.filename}"}")