decode Saturn 4 status responses

cassini.py

@@ -53,17 +53,16 @@ async def create_http_server():
 
 def do_status(printers):
     for i, p in enumerate(printers):
-        attrs = p.desc['Data']['Attributes']
-        status = p.desc['Data']['Status']
-        print_info = status['PrintInfo']
-        file_info = status['FileTransferInfo']
+        name = p.desc.name
+        machine_name = p.desc.machine_name
+        current_status = p.desc.current_status
+        print_info = p.desc.print_info
+        file_transfer_info = p.desc.file_transfer_info
         print(f"{p.addr[0]}:")
-        print(f"    {attrs['Name']} ({attrs['MachineName']})")
-        print(f"    Machine Status: {CurrentStatus(status['CurrentStatus']).name}")
-        print(f"    Print Status: {PrintInfoStatus(print_info['Status']).name}")
-        print(f"    Layers: {print_info['CurrentLayer']}/{print_info['TotalLayer']}")
-        print(f"    File: {print_info['Filename']}")
-        print(f"    File Transfer Status: {FileStatus(file_info['Status']).name}")
+        print(f"    {name} ({machine_name})")
+        print(f"    Machine Status: {current_status}")
+        print(f"    Print Info: {print_info}")
+        print(f"    File Transfer Info: {file_transfer_info}")
 
 def do_status_full(printers):
     for i, p in enumerate(printers):

saturn_printer.py

@@ -50,6 +50,94 @@ class Command(Enum):
     UPLOAD_FILE = 256 # "Check": 0, "CleanCache": 1, "Compress": 0, "FileSize": 3541068, "Filename": "_ResinXP2-ValidationMatrix_v2.goo", "MD5": "205abc8fab0762ad2b0ee1f6b63b1750", "URL": "http://${ipaddr}:58883/f60c0718c8144b0db48b7149d4d85390.goo" },
     SET_MYSTERY_TIME_PERIOD = 512 # "TimePeriod": 5000
 
+class PrintInfo(dict):
+    def __repr__(self) -> str:
+        return f"PrintInfo(\
+    status={self.status},\
+    current_layer={self.current_layer}, total_layer={self.total_layer},\
+    filename={self.filename},\
+)"
+
+    @property
+    def current_layer(self) -> int:
+        return self['CurrentLayer']
+
+    @property
+    def total_layer(self) -> int:
+        return self['TotalLayer']
+
+    @property
+    def filename(self) -> str:
+        return self['Filename']
+
+    @property
+    def status(self) -> PrintInfoStatus:
+        return PrintInfoStatus(self['Status'])
+
+class FileTransferInfo(dict):
+    def __repr__(self) -> str:
+        return f"FileTransferInfo(status={self.status})"
+
+    @property
+    def status(self) -> FileStatus:
+        return FileStatus(self['Status'])
+
+class Desc(dict):
+    @property
+    def current_status(self) -> int | None:
+        try:
+            # Saturn 3
+            return self['Data']['Status']['CurrentStatus']
+        except KeyError:
+            # Saturn 4
+            return self['Data'].get('CurrentStatus')
+
+    @property
+    def id_(self) -> dict:
+        try:
+            # Saturn 3
+            return self['Data']['Attributes']['MainboardID']
+        except KeyError:
+            # Saturn 4
+            return self['Data']['MainboardID']
+
+    @property
+    def machine_name(self) -> str:
+        try:
+            # Saturn 3
+            return self['Data']['Attributes']['MachineName']
+        except KeyError:
+            # Saturn 4
+            return self['Data']['MachineName']
+
+    @property
+    def name(self) -> str:
+        try:
+            # Saturn 3
+            return self['Data']['Attributes']['Name']
+        except KeyError:
+            # Saturn 4
+            return self['Data']['Name']
+
+    @property
+    def print_info(self) -> PrintInfo | None:
+        try:
+            # Saturn 3
+            return PrintInfo(self['Data']['Status']['PrintInfo'])
+        except KeyError:
+            # Saturn 4
+            return None
+
+    @property
+    def file_transfer_info(self) -> FileTransferInfo | None:
+        try:
+            # Saturn 3
+            return FileTransferInfo(self['Data']['Status']['FileTransferInfo'])
+        except KeyError:
+            return None
+
+
+
 def random_hexstr():
     return '%032x' % random.getrandbits(128)
 
@@ -114,12 +202,13 @@ class SaturnPrinter:
                 logging.debug(f"received: {pdata}")
                 self.set_desc(pdata)
 
-    def set_desc(self, desc):
+    def set_desc(self, desc: Desc | dict):
+        desc = Desc(desc)
         self.desc = desc
-        self.id = desc['Data']['Attributes']['MainboardID'] 
-        self.name = desc['Data']['Attributes']['Name']
-        self.machine_name = desc['Data']['Attributes']['MachineName']
-        self.current_status = desc['Data']['Status']['CurrentStatus']
+        self.id = desc.id_
+        self.name = desc.name
+        self.machine_name = desc.machine_name
+        self.current_status = desc.current_status or CurrentStatus.READY.value
         self.busy = self.current_status > 0
 
     # Tell this printer to connect to the specified mqtt and http