Implement MQTT bridge client for Bambu printer integration

octoprint_bambu_printer/printer/bambu_virtual_printer.py

@@ -14,6 +14,8 @@ from octoprint_bambu_printer.printer.print_job import PrintJob
 from pybambu import BambuClient, commands
 import logging
 import logging.handlers
+import json
+import paho.mqtt.client as mqtt
 
 from octoprint.util import RepeatedTimer
 
@@ -45,6 +47,167 @@ class BambuPrinterTelemetry:
     extruderCount: int = 1
 
 
+class BambuMqttBridgeClient:
+    """
+    Implements compatible interface with BambuClient but uses Paho MQTT
+    to connect to a MQTT broker that bridges Bambu topics
+    """
+    def __init__(self, 
+                 device_type,
+                 serial,
+                 host,
+                 mqtt_port=1883,
+                 **kwargs):
+        self._log = logging.getLogger("octoprint.plugins.bambu_printer.BambuMqttBridge")
+        self._device_type = device_type
+        self._serial = serial
+        self._host = host
+        self._mqtt_port = mqtt_port
+        self.connected = False
+        self._mqtt_client = mqtt.Client()
+        self._device_data = self._create_empty_device_data()
+        self._callbacks = {}
+        
+        # Setup callbacks
+        self._mqtt_client.on_connect = self._on_connect
+        self._mqtt_client.on_message = self._on_message
+        self._mqtt_client.on_disconnect = self._on_disconnect
+        
+    def _create_empty_device_data(self):
+        """Creates empty device data structure compatible with BambuClient"""
+        from types import SimpleNamespace
+        
+        # Create basic structure matching BambuClient
+        device = SimpleNamespace()
+        device.print_job = SimpleNamespace()
+        device.print_job.gcode_state = "IDLE"
+        device.temperature = SimpleNamespace()
+        device.temperature.nozzle_temp = AMBIENT_TEMPERATURE
+        device.temperature.target_nozzle_temp = 0.0
+        device.temperature.bed_temp = AMBIENT_TEMPERATURE
+        device.temperature.target_bed_temp = 0.0  
+        device.temperature.chamber_temp = AMBIENT_TEMPERATURE
+        device.hms = SimpleNamespace()
+        device.hms.errors = {"Count": 0}
+        return device
+
+    def _on_connect(self, client, userdata, flags, rc):
+        if rc == 0:
+            self._log.info(f"Connected to MQTT broker at {self._host}:{self._mqtt_port}")
+            self.connected = True
+            
+            # Subscribe to Bambu topics
+            topic_base = f"device/{self._device_type}/{self._serial}"
+            self._mqtt_client.subscribe(f"{topic_base}/report")
+            self._mqtt_client.subscribe(f"{topic_base}/report_hms")
+            
+            if 'callback' in self._callbacks:
+                self._callbacks['callback']("event_printer_data_update")
+                
+            if hasattr(self, 'on_connect') and callable(self.on_connect):
+                self.on_connect(client, userdata, flags, rc)
+        else:
+            self._log.error(f"Failed to connect to MQTT broker, return code: {rc}")
+            
+    def _on_disconnect(self, client, userdata, rc):
+        self._log.warning(f"Disconnected from MQTT broker with code: {rc}")
+        self.connected = False
+        if hasattr(self, 'on_disconnect') and callable(self.on_disconnect):
+            self.on_disconnect(client, userdata, rc)
+            
+    def _on_message(self, client, userdata, msg):
+        try:
+            payload = json.loads(msg.payload.decode('utf-8'))
+            self._log.debug(f"Received message on topic {msg.topic}: {payload}")
+            
+            if msg.topic.endswith('/report'):
+                self._process_report_message(payload)
+                if 'callback' in self._callbacks:
+                    self._callbacks['callback']("event_printer_data_update")
+            elif msg.topic.endswith('/report_hms'):
+                self._process_hms_message(payload)
+                if 'callback' in self._callbacks:
+                    self._callbacks['callback']("event_hms_errors")
+        except json.JSONDecodeError:
+            self._log.error(f"Failed to decode JSON from message: {msg.payload}")
+        except Exception as e:
+            self._log.error(f"Error processing message: {str(e)}")
+            
+    def _process_report_message(self, data):
+        """Process printer status report messages"""
+        if 'print' in data and 'gcode_state' in data['print']:
+            self._device_data.print_job.gcode_state = data['print']['gcode_state']
+            
+        if 'temperature' in data:
+            temp = self._device_data.temperature
+            temp_data = data['temperature']
+            
+            if 'nozzle_temp' in temp_data:
+                temp.nozzle_temp = temp_data['nozzle_temp']
+            if 'target_nozzle_temp' in temp_data:
+                temp.target_nozzle_temp = temp_data['target_nozzle_temp']
+            if 'bed_temp' in temp_data:
+                temp.bed_temp = temp_data['bed_temp']
+            if 'target_bed_temp' in temp_data:
+                temp.target_bed_temp = temp_data['target_bed_temp']
+            if 'chamber_temp' in temp_data:
+                temp.chamber_temp = temp_data['chamber_temp']
+                
+    def _process_hms_message(self, data):
+        """Process HMS error messages"""
+        if 'hms' in data:
+            error_count = 0
+            hms_errors = {"Count": 0}
+            
+            for error in data['hms']:
+                error_count += 1
+                hms_errors[f"{error_count}-Error"] = error['msg']
+                
+            hms_errors["Count"] = error_count
+            self._device_data.hms.errors = hms_errors
+    
+    def connect(self, callback=None):
+        """Connect to MQTT broker"""
+        if callback:
+            self._callbacks['callback'] = callback
+            
+        try:
+            self._mqtt_client.connect(self._host, self._mqtt_port)
+            self._mqtt_client.loop_start()
+            return True
+        except Exception as e:
+            self._log.error(f"Failed to connect to MQTT broker: {str(e)}")
+            return False
+            
+    def disconnect(self):
+        """Disconnect from MQTT broker"""
+        if self.connected:
+            self._mqtt_client.loop_stop()
+            self._mqtt_client.disconnect()
+            self.connected = False
+            
+    def get_device(self):
+        """Returns device data structure"""
+        return self._device_data
+        
+    def publish(self, command):
+        """Publishes command to device"""
+        if not self.connected:
+            return False
+            
+        try:
+            topic_base = f"device/{self._device_type}/{self._serial}"
+            if 'print' in command and 'param' in command['print']:
+                # Assuming commands go to command topic
+                message = json.dumps(command)
+                self._mqtt_client.publish(f"{topic_base}/cmd", message)
+                return True
+        except Exception as e:
+            self._log.error(f"Failed to publish command: {str(e)}")
+            
+        return False
+
+
 # noinspection PyBroadException
 class BambuVirtualPrinter:
     gcode_executor = GCodeExecutor()
@@ -230,13 +393,27 @@ class BambuVirtualPrinter:
         if (
             self._settings.get(["device_type"]) == ""
             or self._settings.get(["serial"]) == ""
-            or self._settings.get(["username"]) == ""
-            or self._settings.get(["access_code"]) == ""
         ):
             msg = "invalid settings to start connection with Bambu Printer"
             self._log.debug(msg)
             raise ValueError(msg)
 
+        # Check if we should use MQTT bridge mode
+        use_mqtt_bridge = self._settings.get_boolean(["use_mqtt_bridge"])
+        
+        if use_mqtt_bridge:
+            self._log.debug(
+                f"connecting via mqtt bridge: {self._settings.get(['mqtt_host'])}:{self._settings.get(['mqtt_port'])}"
+            )
+            # Create MQTT bridge client
+            bambu_client = BambuMqttBridgeClient(
+                device_type=self._settings.get(["device_type"]),
+                serial=self._settings.get(["serial"]),
+                host=self._settings.get(["mqtt_host"]),
+                mqtt_port=int(self._settings.get(["mqtt_port"]) or 1883)
+            )
+        else:
+            # Use standard BambuClient
             self._log.debug(
                 f"connecting via local mqtt: {self._settings.get_boolean(['local_mqtt'])}"
             )
@@ -255,6 +432,7 @@ class BambuVirtualPrinter:
                 email=self._settings.get(["email"]),
                 auth_token=self._settings.get(["auth_token"]),
             )
+            
         bambu_client.on_disconnect = self.on_disconnect(bambu_client.on_disconnect)
         bambu_client.on_connect = self.on_connect(bambu_client.on_connect)
         bambu_client.connect(callback=self.new_update)