Developing new version, more advanced and more flexible

.archive/old_version/.gitignore

@@ -0,0 +1,162 @@
+# ---> Python
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+

.archive/old_version/energy_monitor.py

@@ -9,7 +9,8 @@ from typing import List, Tuple
 import pyodbc
 import snap7
 from dotenv import load_dotenv
-from snap7.util.getters import get_lreal, get_bool
+from snap7.util.getters import get_bool, get_lreal
+
 load_dotenv()
 # Determine the correct driver based on OS
 SQL_DRIVER = (

.archive/old_version/pyS7_test.py

@@ -0,0 +1,20 @@
+import pprint
+import time
+
+from pyS7 import S7Client
+
+LOOPS = 3
+counter = 0
+client = S7Client(address="172.16.3.231", rack=0, slot=2)
+while counter < LOOPS:
+    try:
+        client.connect()
+        tags = ["DB9,DBD0"]
+        data = client.read(tags=tags)
+        print(data)
+    except Exception as e:
+        pprint.pprint(e)
+    finally:
+        client.disconnect()
+    counter += 1
+    time.sleep(1)

.archive/old_version/snap7_test.py

@@ -1,14 +1,16 @@
-import time
-import snap7
-from snap7.util.getters import get_lreal, get_dint
 import pprint
+import time
+
+import snap7
+from snap7.util.getters import get_dint, get_lreal
 
 LOOPS = 20
 counter = 0
 while counter < LOOPS:
     try:
         plc = snap7.client.Client()
-        plc.connect("172.16.3.231", 0, 2)
+        plc.connect("172.16.3.231", 0, 2) # fagor 6
+        plc.connect("172.16.3.230", 0, 2) # fagor 5
         # pprint.pprint(plc.get_cpu_state())
         data = plc.db_read(9, 0, 4)  # Define range of bytes to read
         energy_value = get_dint(data, 0)  # Read energy value

.env.template

@@ -1,9 +0,0 @@
-# Database credentials
-DB_SERVER=
-DB_NAME=
-DB_USER=
-DB_PASSWORD=
-
-# Seq logging credentials
-SEQ_URL=
-SEQ_API_KEY=

.gitignore

@@ -1,162 +1,11 @@
-# ---> Python
-# Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]
-*$py.class
-
-# C extensions
-*.so
-
-# Distribution / packaging
-.Python
-build/
-develop-eggs/
-dist/
-downloads/
-eggs/
-.eggs/
-lib/
-lib64/
-parts/
-sdist/
-var/
-wheels/
-share/python-wheels/
-*.egg-info/
-.installed.cfg
-*.egg
-MANIFEST
-
-# PyInstaller
-#  Usually these files are written by a python script from a template
-#  before PyInstaller builds the exe, so as to inject date/other infos into it.
-*.manifest
-*.spec
-
-# Installer logs
-pip-log.txt
-pip-delete-this-directory.txt
-
-# Unit test / coverage reports
-htmlcov/
-.tox/
-.nox/
-.coverage
-.coverage.*
-.cache
-nosetests.xml
-coverage.xml
-*.cover
-*.py,cover
-.hypothesis/
-.pytest_cache/
-cover/
-
-# Translations
-*.mo
-*.pot
-
-# Django stuff:
-*.log
-local_settings.py
-db.sqlite3
-db.sqlite3-journal
-
-# Flask stuff:
-instance/
-.webassets-cache
-
-# Scrapy stuff:
-.scrapy
-
-# Sphinx documentation
-docs/_build/
-
-# PyBuilder
-.pybuilder/
-target/
-
-# Jupyter Notebook
-.ipynb_checkpoints
-
-# IPython
-profile_default/
-ipython_config.py
-
-# pyenv
-#   For a library or package, you might want to ignore these files since the code is
-#   intended to run in multiple environments; otherwise, check them in:
-# .python-version
-
-# pipenv
-#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
-#   However, in case of collaboration, if having platform-specific dependencies or dependencies
-#   having no cross-platform support, pipenv may install dependencies that don't work, or not
-#   install all needed dependencies.
-#Pipfile.lock
-
-# poetry
-#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
-#   This is especially recommended for binary packages to ensure reproducibility, and is more
-#   commonly ignored for libraries.
-#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
-#poetry.lock
-
-# pdm
-#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
-#pdm.lock
-#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
-#   in version control.
-#   https://pdm.fming.dev/#use-with-ide
-.pdm.toml
-
-# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
-__pypackages__/
-
-# Celery stuff
-celerybeat-schedule
-celerybeat.pid
-
-# SageMath parsed files
-*.sage.py
-
-# Environments
+*.class
 .env
 .venv
-env/
 venv/
 ENV/
-env.bak/
-venv.bak/
-
-# Spyder project settings
-.spyderproject
-.spyproject
-
-# Rope project settings
-.ropeproject
-
-# mkdocs documentation
-/site
-
-# mypy
-.mypy_cache/
-.dmypy.json
-dmypy.json
-
-# Pyre type checker
-.pyre/
-
-# pytype static type analyzer
-.pytype/
-
-# Cython debug symbols
-cython_debug/
-
-# PyCharm
-#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
-#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
-#  and can be added to the global gitignore or merged into this file.  For a more nuclear
-#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
-#.idea/
-
+*.log
+.pytest_cache/
+.coverage
+config.ini

classes.py

@@ -1,131 +0,0 @@
-import os
-import platform
-import socket
-from datetime import datetime
-from typing import Optional
-
-import pyodbc
-import snap7
-from dotenv import load_dotenv
-
-load_dotenv()
-
-
-# Entire scheduler config class
-class SchedulerConfig:
-    interval: int
-    next_read: datetime
-
-
-# PLC properties class (energy, air)
-class Plc:
-    id: int
-    name: str
-    ip: str
-    db_number: int  # Where the data is stored in the PLC
-    is_enabled: bool  # True if PLC will be read from
-    air_db_offset: int
-    energy_db_offset: int
-    state_db_offset: int
-    location: str  # H1 or H2
-    last_energy_read: float
-    last_air_read: float
-    last_state_read: bool
-    last_read_timestamp: datetime
-
-    def __init__(self, id: int, name: str, ip: str, db_number: int, 
-                 air_db_offset: int, energy_db_offset: int, 
-                 state_db_offset: int, location: str) -> None:
-        self.id = id
-        self.name = name
-        self.ip = ip
-        self.db_number = db_number
-        self.is_enabled = True  # default value
-        self.air_db_offset = air_db_offset
-        self.energy_db_offset = energy_db_offset
-        self.state_db_offset = state_db_offset
-        self.location = location
-        self.last_energy_read = 0.0
-        self.last_air_read = 0.0
-        self.last_state_read = False
-        self.last_read_timestamp = None
-        
-
-    def check_connection_snap(self) -> bool:
-        """Check if the PLC is reachable."""
-        try:
-            client = snap7.client.Client()
-            client.connect(self.ip, 0, 1)
-            client.disconnect()
-            return True
-        except Exception as e:
-            # logger.error(f"❌ Error checking PLC connection: {e}")
-            return False
-
-    def check_connection_socket(self) -> bool:
-        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
-            sock.settimeout(1)
-            return sock.connect_ex((self.ip, 102)) == 0
-
-
-# PAC properties class (energy)
-class Pac:
-    id: int
-    name: str
-    ip: str
-    port: int
-    is_enabled: bool
-    location: str  # H1 or H2
-    last_energy_read: float
-    last_read_timestamp: datetime
-
-
-class Database:
-    # Private class attributes (internal use)
-    _sql_driver = (
-        "ODBC Driver 18 for SQL Server"
-        if platform.system() == "Linux"
-        else "SQL Server"
-    )
-    _instance: Optional["Database"] = None
-    _connection = None
-
-    def __new__(cls):
-        if cls._instance is None:
-            cls._instance = super(Database, cls).__new__(cls)
-        return cls._instance
-
-    # Public methods (external interface)
-    def __init__(self):
-        if self._connection is None:
-            self._connection = self._create_connection()
-
-    def execute_query(self, query: str, params: tuple = ()) -> pyodbc.Cursor:
-        """Execute SQL query and return cursor."""
-        cursor = self.get_connection().cursor()
-        cursor.execute(query, params)
-        return cursor
-
-    def get_connection(self) -> pyodbc.Connection:
-        """Get database connection, create new if needed."""
-        if not self._connection or not self._connection.connected:
-            self._connection = self._create_connection()
-        return self._connection
-
-    def close(self) -> None:
-        """Close database connection."""
-        if self._connection:
-            self._connection.close()
-            self._connection = None
-
-    # Private methods (internal use)
-    def _create_connection(self) -> pyodbc.Connection:
-        """Create new database connection."""
-        connection_string = (
-            "DRIVER={SQL Server};"
-            f"SERVER={os.getenv('DB_SERVER')};"
-            f"DATABASE={os.getenv('DB_NAME')};"
-            f"UID={os.getenv('DB_USER')};"
-            f"PWD={os.getenv('DB_PASSWORD')}"
-        )
-        return pyodbc.connect(connection_string)

config.ini.template

@@ -0,0 +1,16 @@
+[mssql]
+host = 
+name = 
+password = 
+user = 
+
+[postgres]
+host = 
+name = 
+password = 
+port = 
+user = 
+
+[seq]
+api_key = 
+url = 

notes.md

@@ -0,0 +1,94 @@
+# IndustrialTracker
+
+## Databse model
+
+### Device
+Main device object used as base for dependency injection
+- id      - number
+- name    - string
+- type    - (Relation)->DeviceType
+- enabled - boolean
+
+### DeviceType
+Device type definition
+- id    - number
+- name  - string
+
+### Reading
+Reading object used to store data from Device
+- id            - number
+- device        - (Relation)->Device
+- reading_time  - date
+- energy        - number
+- air           - number
+- running       - boolean
+- ... place for more data eventually
+
+### PLC
+PLC object used to store configuration of PLC
+- id                - number
+- ip                - string
+- port              - number
+- db_number         - number
+- energy_offset     - number
+- air_offset        - number
+- running_offset    - number
+- ... place for more offsets definition
+
+### PAC
+PAC object used to store configuration of PAC
+- id    - number
+- ip    - string
+- port  - number
+... something I missed 
+
+### Scheduler
+- id                - number
+- name              - string
+- interval_seconds  - number
+- next_run          - date
+... something I missed
+
+## Workflow
+
+### Main process
+`main.py`
+
+Is infinite loop that:
+- checks scheduler settings from database (Scheduler)
+- checks if it's time to run scheduler
+- if yes, runs scheduler then updates next_run date following schema date.now() + interval_seconds
+
+### Scheduler process/service
+`scheduler_service.py`
+
+When scheduler is run, it:
+- gets all devices from database (Device)
+- for each device that is enable, at first, check if it is accessible (by pinging)
+- if yes, then it gets data from device (via read_service) and saves it to database (Reading)
+
+### Read process/service
+`read_service.py`
+> Read process should be unified for all devices and handled by dependency injection.
+Abstract class for dependency injection is declared in `readers/device_reader.py`.
+
+Each device type has it's own reader class that implements pinging function and reading function.
+
+* PLC reader is implemented in `readers/plc_reader.py`
+* PAC reader is implemented in `readers/pac_reader.py`
+
+#### PLC reader
+
+Utilizes `python-snap7` library to communicate with PLC.
+
+#### PAC reader
+>  TODO: PAC reader is not implemented yet.
+
+Utilizes `---` library to communicate with PAC.
+
+### Database process/service
+`database_service.py`
+
+Singleton class that implements all database operations.
+
+> Most use cases should be in scheduler process where readed data are going to be saved to database.

pyS7_test.py

@@ -1,29 +0,0 @@
-import time
-from pyS7 import S7Client
-import pprint
-
-LOOPS = 3
-counter = 0
-client = S7Client(address="172.16.3.231", rack=0, slot=2)
-while counter < LOOPS:
-    try:
-        # Create a new 'S7Client' object to connect to S7-300/400/1200/1500 PLC.
-        # Provide the PLC's IP address and slot/rack information
-
-        # client = S7Client(address="172.16.4.220", rack=0, slot=2)
-        # Establish connection with the PLC
-        client.connect()
-
-        # Define area tags to read
-        tags = ["DB9,DBD0"]
-
-        # Read the data from the PLC using the specified tag list
-        data = client.read(tags=tags)
-
-        print(data)  # [True, False, 123, True, 10, -2.54943805634653e-12, 'Hello']
-    except Exception as e:
-        pprint.pprint(e)
-    finally:
-        client.disconnect()
-    counter += 1
-    time.sleep(1)

requirements-dev.txt

@@ -0,0 +1,3 @@
+-r requirements.txt
+pytest
+ruff

requirements.txt

@@ -1,13 +1,7 @@
-certifi==2024.8.30
-charset-normalizer==3.4.0
-idna==3.10
-pyodbc==5.2.0
-pyS7 @ git+https://github.com/FiloCara/pyS7@761c785799106a04ccbc9e19d6201f728165231d
-python-dateutil==2.9.0.post0
-python-dotenv==1.0.1
-python-snap7==2.0.2
-PyYAML==6.0.2
-requests==2.32.3
-seqlog==0.3.31
-six==1.16.0
-urllib3==2.2.3
+sqlalchemy
+python-snap7
+pyodbc
+python-dotenv
+seqlog
+pymodbus
+pyS7 @ git+https://github.com/FiloCara/pyS7@761c785799106a04ccbc9e19d6201f728165231d

src/models/__init__.py

@@ -0,0 +1,11 @@
+from sqlalchemy.ext.declarative import declarative_base
+
+from .device import Device, DeviceType
+from .pac import PAC
+from .plc import PLC
+from .reading import Reading
+from .scheduler import Scheduler
+
+Base = declarative_base()
+
+__all__ = ["Base", "Device", "DeviceType", "PLC", "PAC", "Reading", "Scheduler"]

src/models/device.py

@@ -0,0 +1,28 @@
+from sqlalchemy import Column, ForeignKey, Integer, String
+from sqlalchemy.orm import relationship
+
+from models import Base
+
+
+class DeviceType(Base):
+    __tablename__ = "device_type"
+
+    id = Column(Integer, primary_key=True)
+    name = Column(String(100), nullable=False)
+
+    devices = relationship("Device", back_populates="type")
+
+
+class Device(Base):
+    __tablename__ = "device"
+
+    id = Column(Integer, primary_key=True)
+    name = Column(String(100), nullable=False)
+    type_id = Column(Integer, ForeignKey("device_type.id"), nullable=False)
+    enabled = Column(Integer, default=True, nullable=False)
+
+    # Relationships
+    type = relationship("DeviceType", back_populates="devices")
+    plc_config = relationship("PLC", back_populates="device", uselist=False)
+    pac_config = relationship("PAC", back_populates="device", uselist=False)
+    readings = relationship("Reading", back_populates="device")

src/models/pac.py

@@ -0,0 +1,15 @@
+from sqlalchemy import Column, ForeignKey, Integer, String
+from sqlalchemy.orm import relationship
+
+from models import Base
+
+
+class PAC(Base):
+    __tablename__ = "pac"
+
+    id = Column(Integer, primary_key=True)
+    device_id = Column(Integer, ForeignKey("device.id"), nullable=False)
+    ip = Column(String(15), nullable=False)
+    port = Column(Integer, default=102)
+
+    device = relationship("Device", back_populates="pac_config")

src/models/plc.py

@@ -0,0 +1,19 @@
+from sqlalchemy import Column, ForeignKey, Integer, String
+from sqlalchemy.orm import relationship
+
+from models import Base
+
+
+class PLC(Base):
+    __tablename__ = "plc"
+
+    id = Column(Integer, primary_key=True)
+    device_id = Column(Integer, ForeignKey("device.id"), nullable=False)
+    ip = Column(String(15), nullable=False)
+    port = Column(Integer, default=102)
+    db_number = Column(Integer, nullable=False)
+    energy_offset = Column(Integer)
+    air_offset = Column(Integer)
+    running_offset = Column(Integer)
+
+    device = relationship("Device", back_populates="plc_config")

src/models/reading.py

@@ -0,0 +1,19 @@
+import datetime
+
+from sqlalchemy import Boolean, Column, DateTime, Float, ForeignKey, Integer
+from sqlalchemy.orm import relationship
+
+from models import Base
+
+
+class Reading(Base):
+    __tablename__ = "reading"
+
+    id = Column(Integer, primary_key=True)
+    device_id = Column(Integer, ForeignKey("device.id"), nullable=False)
+    reading_time = Column(DateTime, default=datetime.now(datetime.timezone.utc))
+    energy = Column(Float)
+    air = Column(Float)
+    running = Column(Boolean)
+
+    device = relationship("Device", back_populates="readings")

src/models/scheduler.py

@@ -0,0 +1,12 @@
+from sqlalchemy import Column, DateTime, Integer, String
+
+from models import Base
+
+
+class Scheduler(Base):
+    __tablename__ = "scheduler"
+
+    id = Column(Integer, primary_key=True)
+    name = Column(String(100), nullable=False)
+    interval_seconds = Column(Integer, nullable=False)
+    next_run = Column(DateTime, nullable=False)

src/readers/__init__.py

@@ -0,0 +1,5 @@
+from .device_reader import DeviceReader
+from .pac_reader import PACReader
+from .plc_reader import PLCReader
+
+__all__ = ["DeviceReader", "PLCReader", "PACReader"]

src/readers/device_reader.py

@@ -0,0 +1,20 @@
+from abc import ABC, abstractmethod
+
+from src.models import Device, Reading
+
+
+# Abstract base class for device readers
+# This class defines a common interface that all device readers must implement
+# Using abstract classes ensures consistency across different device types
+class DeviceReader(ABC):
+    @abstractmethod
+    def is_accessible(self, device: Device) -> bool:
+        # This abstract method forces all child classes to implement their own
+        # device accessibility check logic
+        pass
+
+    @abstractmethod
+    def collect_reading(self, device: Device) -> Reading:
+        # This abstract method forces all child classes to implement their own
+        # data collection logic specific to the device type
+        pass

src/readers/pac_reader.py

@@ -0,0 +1,16 @@
+from .device_reader import DeviceReader
+from src.models import Device, Reading
+
+
+# Concrete implementation for PAC (Programmable Automation Controller) devices
+# Inherits from DeviceReader and must implement all abstract methods
+class PACReader(DeviceReader):
+    def is_accessible(self, device: Device) -> bool:
+        # Implement PAC ping check
+        # This method will contain specific logic for checking PAC connectivity
+        pass
+
+    def collect_reading(self, device: Device) -> Reading:
+        # Implement PAC data collection
+        # This method will contain specific logic for reading data from PAC devices
+        pass

src/readers/plc_reader.py

@@ -0,0 +1,16 @@
+from .device_reader import DeviceReader
+from src.models import Device, Reading
+
+
+# Concrete implementation for PLC (Programmable Logic Controller) devices
+# Inherits from DeviceReader and must implement all abstract methods
+class PLCReader(DeviceReader):
+    def is_accessible(self, device: Device) -> bool:
+        # Implement PLC ping check
+        # This method will contain specific logic for checking PLC connectivity
+        pass
+
+    def collect_reading(self, device: Device) -> Reading:
+        # Implement PLC data collection
+        # This method will contain specific logic for reading data from PLC devices
+        pass

src/scripts/test_db.py

@@ -0,0 +1,46 @@
+from datetime import datetime, timedelta
+from services.database_service import DatabaseService
+
+def test_database_operations():
+    # Initialize database service
+    db = DatabaseService()
+    
+    # Test getting device types
+    print("\n=== Testing Device Types ===")
+    device_types = db.get_device_types()
+    print(f"Found {len(device_types)} device types")
+    for dt in device_types:
+        print(f"- {dt.name}")
+
+    # Test getting enabled devices
+    print("\n=== Testing Enabled Devices ===")
+    enabled_devices = db.get_enabled_devices()
+    print(f"Found {len(enabled_devices)} enabled devices")
+    for device in enabled_devices:
+        print(f"- {device.name} (Type: {device.type.name})")
+
+    # Test scheduler operations
+    print("\n=== Testing Scheduler ===")
+    scheduler = db.get_scheduler("main")
+    if scheduler:
+        print(f"Current scheduler: {scheduler.name}")
+        print(f"Current next_run: {scheduler.next_run}")
+        
+        # Test updating scheduler
+        new_next_run = datetime.now() + timedelta(minutes=5)
+        db.update_scheduler_next_run(scheduler, new_next_run)
+        print(f"Updated next_run to: {new_next_run}")
+
+    # Test getting readings for a device
+    print("\n=== Testing Readings ===")
+    if enabled_devices:
+        test_device = enabled_devices[0]
+        from_date = datetime.now() - timedelta(days=1)
+        to_date = datetime.now()
+        readings = db.get_readings_by_device(test_device.id, from_date, to_date)
+        print(f"Found {len(readings)} readings for device {test_device.name}")
+        for reading in readings[:5]:  # Show first 5 readings
+            print(f"- Time: {reading.reading_time}, Energy: {reading.energy}")
+
+if __name__ == "__main__":
+    test_database_operations()

src/services/database_service.py

@@ -0,0 +1,79 @@
+from datetime import datetime
+from typing import List, Optional
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session
+
+from src.models import PAC, PLC, Device, DeviceType, Reading, Scheduler
+from utils.config import Config
+
+
+class SingletonMeta(type):
+    _instances = {}
+
+    def __call__(cls, *args, **kwargs):
+        """
+        This is a singleton metaclass implementation that ensures only one instance of a class is created.
+        When a class with this metaclass is instantiated:
+        1. It checks if the class already has an instance in _instances dictionary
+        2. If no instance exists, it creates one using super().__call__ and stores it
+        3. If instance exists, it returns the stored instance
+        This way, multiple calls to create an instance will always return the same object
+        """
+        if cls not in cls._instances:
+            cls._instances[cls] = super().__call__(*args, **kwargs)
+        return cls._instances[cls]
+
+class DatabaseService(metaclass=SingletonMeta):
+    def __init__(self):
+        config = Config()
+        engine = create_engine(config.get_database_url())
+        self.session = Session(engine)
+
+    def get_enabled_devices(self) -> List[Device]:
+        return self.session.query(Device).filter(Device.enabled.is_(True)).all()
+
+    def get_scheduler(self, name: str) -> Optional[Scheduler]:
+        return self.session.query(Scheduler).filter(Scheduler.name == name).first()
+
+    def update_scheduler_next_run(
+        self, scheduler: Scheduler, next_run: datetime
+    ) -> None:
+        scheduler.next_run = next_run
+        self.session.commit()
+
+    def save_reading(self, reading: Reading) -> None:
+        self.session.add(reading)
+        self.session.commit()
+
+    def save_readings(self, readings: List[Reading]) -> None:
+        self.session.add_all(readings)
+        self.session.commit()
+
+    def get_device_types(self) -> List[DeviceType]:
+        return self.session.query(DeviceType).all()
+
+    def get_plc_config(self, device_id: int) -> Optional[PLC]:
+        return self.session.query(PLC).filter(PLC.id == device_id).first()
+
+    def get_pac_config(self, device_id: int) -> Optional[PAC]:
+        return self.session.query(PAC).filter(PAC.id == device_id).first()
+
+    def get_device(self, device_id: int) -> Optional[Device]:
+        return self.session.query(Device).filter(Device.id == device_id).first()
+
+    def get_device_by_name(self, name: str) -> Optional[Device]:
+        return self.session.query(Device).filter(Device.name == name).first()
+
+    def get_readings_by_device(
+        self, device_id: int, from_date: datetime, to_date: datetime
+    ) -> List[Reading]:
+        return (
+            self.session.query(Reading)
+            .filter(
+                Reading.device_id == device_id,
+                Reading.reading_time >= from_date,
+                Reading.reading_time <= to_date,
+            )
+            .all()
+        )

src/services/scheduler_service.py

@@ -0,0 +1,28 @@
+from datetime import datetime, timedelta
+
+from sqlalchemy.orm import Session
+
+from src.models import Scheduler
+
+
+class SchedulerService:
+    def __init__(self, db_session: Session):
+        # Initialize the scheduler service with a database session
+        self.session = db_session
+
+    def run_main_loop(self):
+        # Main loop that continuously checks and executes scheduled tasks
+        while True:
+            # Get all scheduler entries from the database
+            schedulers = self.session.query(Scheduler).all()
+            for scheduler in schedulers:
+                # Check if it's time to execute the scheduler
+                if datetime.now(datetime.timezone.utc) >= scheduler.next_run:
+                    # Execute the scheduled task
+                    self.execute_scheduler(scheduler)
+                    # Calculate and set the next run time based on the interval
+                    scheduler.next_run = datetime.now(
+                        datetime.timezone.utc
+                    ) + timedelta(seconds=scheduler.interval_seconds)
+                    # Save changes to the database
+                    self.session.commit()

src/utils/config.py

@@ -0,0 +1,34 @@
+from configparser import ConfigParser
+from pathlib import Path
+import platform
+
+
+class Config:
+    _instance = None
+
+    def __new__(cls):
+        if cls._instance is None:
+            cls._instance = super().__new__(cls)
+            config = ConfigParser()
+            config_path = Path("config.ini")
+            config.read(config_path)
+            cls._instance.config = config
+        return cls._instance
+
+    def get_mssql_url(self) -> str:
+        mssql = self.config["mssql"]
+        driver = "ODBC Driver 18 for SQL Server" if platform.platform.system() == "Linux" else "SQL Server"
+        driver = driver.replace(" ", "+")
+        return f"mssql+pyodbc://{mssql['user']}:{mssql['password']}@{mssql['host']}/{mssql['name']}?driver={driver}"
+
+    def get_postgres_url(self) -> str:
+        db = self.config["postgres"]
+        return f"postgresql://{db['user']}:{db['password']}@{db['host']}/{db['name']}"
+
+    def get_seq_url(self) -> str:
+        seq = self.config["seq"]
+        return seq["url"]
+
+    def get_seq_api_key(self) -> str:
+        seq = self.config["seq"]
+        return seq["api_key"]

test-server.sh

@@ -0,0 +1,2 @@
+#!.venv/bin/python
+python -m snap7.server