Working version

const.py

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+"""Constants for the Modbus RTU Monitor integration."""
+
+from dataclasses import dataclass
+from datetime import datetime, timedelta
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    pass
+
+DOMAIN = "modbus_rtu_monitor"
+
+# Default values
+DEFAULT_PORT = 502
+
+# Modbus register configuration
+TEMP_HUMIDITY_REGISTER = 0x83  # Register 131 (decimal)
+SETPOINT_REGISTER = 144  # Register 144 (decimal, 0x90 hex)
+REGISTER_COUNT = 4
+
+# Coil configuration
+COIL_START_ADDRESS = 0x01  # Starting coil address (1 in decimal)
+COIL_COUNT = 40  # Number of coils to monitor
+
+# Register monitoring configuration
+REGISTER_START_ADDRESS = 0xA5  # Register 165 (decimal)
+REGISTER_MONITOR_COUNT = 20  # Number of registers to monitor (165-184)
+
+# Additional register monitoring
+REGISTER_START_ADDRESS_2 = 0xD2  # Register 210 (decimal)
+REGISTER_MONITOR_COUNT_2 = 8  # Number of registers to monitor (210-217)
+
+# Third register range
+REGISTER_START_ADDRESS_3 = 0x8C  # Register 140 (decimal)
+REGISTER_MONITOR_COUNT_3 = 23  # Number of registers to monitor (140-162)
+
+# Availability timeout (if no data for 5 minutes, mark unavailable)
+AVAILABILITY_TIMEOUT = timedelta(minutes=5)
+
+# Update throttling (prevent overwhelming HA with high-frequency Modbus traffic)
+COORDINATOR_UPDATE_INTERVAL = timedelta(seconds=5)  # Minimum time between coordinator updates
+FRAME_PROCESSING_DELAY = 0.1  # Seconds to sleep between frame processing batches
+
+# Device info
+MANUFACTURER = "Modbus RTU"
+MODEL = "Temperature/Humidity Monitor"
+
+
+@dataclass
+class SlaveData:
+    """Data for a discovered Modbus slave."""
+
+    slave_id: int
+    temperature: float | None
+    humidity: float | None
+    last_seen: datetime
+    available: bool = True
+    coils: list[bool] | None = None  # 40 coil states (True=ON, False=OFF)
+    registers: dict[int, int] | None = None  # Register address -> int16 value
+
+
+@dataclass
+class ModbusRTUFrame:
+    """Decoded Modbus RTU frame."""
+
+    slave_id: int
+    function_code: int
+    data: bytes
+    is_request: bool
+    is_response: bool
+    start_address: int | None = None
+    register_count: int | None = None
+    values: list[int] | None = None
+    coil_values: list[bool] | None = None  # For function code 01 (Read Coils) responses