Add comprehensive debug logging to trace MQTT data flow

- Log printer_data object ID at each step (client → api → coordinator)
- Log current_status and print_info.status when status is assigned
- Log whether attributes exist when returned
- This will help diagnose why entities show 'Unknown' despite successful parsing

The logging will show if the same printer_data object is being used
throughout the chain, or if there's a disconnection in the data flow.

Author: danielcherubini

custom_components/elegoo_printer/api.py

@@ -403,6 +403,16 @@ async def async_get_status(self) -> PrinterData:
 
         """  # noqa: E501
         self.printer_data = await self.client.get_printer_status()
+        status = (
+            self.printer_data.status.current_status
+            if self.printer_data.status
+            else None
+        )
+        self._logger.debug(
+            "async_get_status() got printer_data (id: %s, status: %s)",
+            id(self.printer_data),
+            status,
+        )
         return self.printer_data
 
     async def async_get_attributes(self) -> PrinterData:
@@ -665,6 +675,16 @@ async def async_get_printer_data(self) -> PrinterData:
         await self.async_get_print_history()
         await self.async_get_current_task()
         self.printer_data.calculate_current_job_end_time()
+        status = (
+            self.printer_data.status.current_status
+            if self.printer_data.status
+            else None
+        )
+        self._logger.debug(
+            "async_get_printer_data() returning printer_data (id: %s, status: %s)",
+            id(self.printer_data),
+            status,
+        )
         return self.printer_data
 
     async def _setup_proxy_if_enabled(self, printer: Printer) -> Printer | None:

custom_components/elegoo_printer/mqtt/client.py

@@ -367,6 +367,16 @@ async def get_printer_status(self) -> PrinterData:
             The latest printer status information.
 
         """
+        status = (
+            self.printer_data.status.current_status
+            if self.printer_data.status
+            else None
+        )
+        self.logger.debug(
+            "get_printer_status() returning printer_data (id: %s, status: %s)",
+            id(self.printer_data),
+            status,
+        )
         return self.printer_data
 
     async def get_printer_attributes(self) -> PrinterData:
@@ -381,6 +391,12 @@ async def get_printer_attributes(self) -> PrinterData:
             The latest printer attributes information.
 
         """
+        has_attrs = self.printer_data.attributes is not None
+        self.logger.debug(
+            "get_printer_attributes() returning (id: %s, has attributes: %s)",
+            id(self.printer_data),
+            has_attrs,
+        )
         return self.printer_data
 
     async def set_printer_video_stream(self, *, enable: bool) -> None:
@@ -782,7 +798,15 @@ def _status_handler(self, data: dict[str, Any]) -> None:
             )
             self.logger.debug("PrinterStatus.from_json() succeeded")
             self.printer_data.status = printer_status
-            self.logger.debug("Assigned printer_data.status successfully")
+            print_info_status = (
+                printer_status.print_info.status if printer_status.print_info else None
+            )
+            self.logger.debug(
+                "Assigned printer_data.status (id: %s, status: %s, print_info: %s)",
+                id(self.printer_data),
+                printer_status.current_status,
+                print_info_status,
+            )
         except Exception:
             self.logger.exception("Exception in _status_handler")