from pymodbus.client import ModbusTcpClient
import struct
import time

# Verbindung zur Wärmepumpe
ip = '10.0.0.10'
port = 502
unit_id = 1

# Liste von interessanten Holding-Register-Adressen
registers = {
    300: {'desc': 'Außentemperatur in °C', 'type': 'REAL'},
    315: {'desc': 'Spannung FU Ausgang in V', 'type': 'REAL'},
}

client = ModbusTcpClient(ip, port=port)

try:
    if not client.connect():
        print("Verbindung zur Wärmepumpe fehlgeschlagen.")
        exit(1)
    print("Verbindung zur Wärmepumpe erfolgreich.")

    while True:
        print(f"\n--- Neue Abfrage --- {time.strftime('%Y-%m-%d %H:%M:%S')} ---")
        for address, info in registers.items():
            reg_type = info['type']
            result = client.read_input_registers(address, count=2 if reg_type == 'REAL' else 1)#, unit=unit_id)
            if result.isError():
                print(f"Fehler beim Lesen von Adresse {address}: {result}")
                continue

            if reg_type == 'REAL':
                decoder = struct.pack('>HH', result.registers[0], result.registers[1])
                value = struct.unpack('>f', decoder)[0]
            else:
                value = result.registers[0]

            print(f"Adresse {address} - {info['desc']}: {value}")

        time.sleep(10)

except KeyboardInterrupt:
    print("Beendet durch Benutzer (Ctrl+C).")
finally:
    client.close()