Nibe library

Library for communication with Nibe heatpumps.

Supported heatpump models

• F1145
• F1155
• F1245
• F1255
• F1345
• F1355
• F370
• F470
• F730
• F750
• SMO20
• SMO40
• VVM225
• VVM310
• VVM320
• VVM325
• VVM500

Connection methods

• RS485 hardwired using NibeGW on Arduino or RPi. NibeGW was developed by Pauli Anttila for Openhab's integration.
• (Not yet tesed) TCP Modbus for S Models
• (Not yet tesed) Serial Modbus for Nibe Modbus 40)

NibeGW

For this connection method to work you will need to connect an Arduino with special firmware that will act as a proxy between Heatpump RS485 and this library. Some details regarding how this method works can be found here.

NibeGW firmware for Arduino or RPi can be download here.

• Library will open 9999 UDP listening port to receive packets from NibeGW.
• For read commands library will send UDP packets to NibeGW port 9999.
• For write commands library will send UDP packets to NibeGW port 10000.

Ports are configurable

import asyncio
import logging

from nibe.coil import Coil
from nibe.connection.nibegw import NibeGW
from nibe.heatpump import HeatPump, Model

logger = logging.getLogger("nibe").getChild(__name__)

def on_coil_update(coil: Coil):
    logger.debug(f"{coil.name}: {coil.value}")

async def main():
    heatpump = HeatPump(Model.F1255)
    heatpump.initialize()

    heatpump.subscribe(HeatPump.COIL_UPDATE_EVENT, on_coil_update)

    connection = NibeGW(heatpump=heatpump, remote_ip="192.168.1.2")
    await connection.start()

if __name__ == '__main__':
    logging.basicConfig(level=logging.DEBUG)

    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())
    loop.run_forever()

TCP Modbus

With S series heatpumps

import asyncio
import logging

from nibe.coil import Coil
from nibe.connection.modbus import Modbus
from nibe.heatpump import HeatPump, Model

logger = logging.getLogger("nibe").getChild(__name__)

def on_coil_update(coil: Coil):
    logger.debug(f"on_coil_update: {coil.name}: {coil.value}")

async def main():
    heatpump = HeatPump(Model.F1255)
    heatpump.initialize()

    heatpump.subscribe(HeatPump.COIL_UPDATE_EVENT, on_coil_update)

    connection = Modbus(heatpump=heatpump, url="tcp://192.168.1.2:502", slave_id=1)
    
    coil = heatpump.get_coil_by_name('bt50-room-temp-s1-40033')
    await connection.read_coil(coil)
    
    logger.debug(f"main: {coil.name}: {coil.value}")

if __name__ == '__main__':
    logging.basicConfig(level=logging.DEBUG)

    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())
    loop.run_forever()

Serial Modbus

With NIBE MODBUS 40

import asyncio
import logging

from nibe.coil import Coil
from nibe.connection.modbus import Modbus
from nibe.heatpump import HeatPump, Model

logger = logging.getLogger("nibe").getChild(__name__)

def on_coil_update(coil: Coil):
    logger.debug(f"on_coil_update: {coil.name}: {coil.value}")

async def main():
    heatpump = HeatPump(Model.F1255)
    heatpump.initialize()

    heatpump.subscribe(HeatPump.COIL_UPDATE_EVENT, on_coil_update)

    connection = Modbus(heatpump=heatpump, url="serial:///dev/ttyS0", slave_id=1, conn_options={"baudrate": 9600})
    
    coil = heatpump.get_coil_by_name('bt50-room-temp-s1-40033')
    await connection.read_coil(coil)
    
    logger.debug(f"main: {coil.name}: {coil.value}")

if __name__ == '__main__':
    logging.basicConfig(level=logging.DEBUG)

    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())
    loop.run_forever()

Disclaimer

Nibe is registered mark of NIBE Energy Systems.

The code was developed as a way of integrating personally owned Nibe heatpump, and it cannot be used for other purposes. It is not affiliated with any company, and it doesn't have commercial intent.

The code is provided AS IS and the developers will not be held responsible for failures in the heatpump operation or any other malfunction.

HOWTOs for developers

How to capture and replay traffic from NibeGW

Requirements

APT:

• tcpdump
• tcpreplay

On recipient device run:

sudo tcpdump -i eth0 udp port 9999 -w nibe-9999.pcap

tcprewrite --infile=nibe-9999.pcap --outfile=nibe-9999rw.pcap --dstipmap=192.168.1.3:192.168.1.2 --enet-dmac=CC:CC:CC:CC:CC:CC --fixcsum

sudo tcpreplay --intf1=eth0 nibe-9999rw.pcap

You will need to replace IP addresses for rewrite and Mac address of new recipient device