PyPlumIO 0.1.15

PyPlumIO is a native ecoNET library for Plum ecoMAX controllers.

PyPlumIO is a native ecoNET library for Plum ecoMAX controllers.

Overview

This package aims to provide complete and easy to use solution for communicating with climate devices by Plum Sp. z o.o.

Currently it supports reading and writing parameters of ecoMAX automatic pellet boiler controllers, getting service password and sending network information to show on controller's display.

Devices can be connected directly via RS-485 to USB adapter or through network by using RS-485 to Ethernet/WiFi converter.

Table of contents

• Usage
  • TCP
  • Serial
  • Shortcuts
  • Data and Parameters
  • Reading
  • Writing
  • Network Information
• Protocol
  • Frame Structure
  • Requests and Responses
  • Communication
  • Frame Versioning
• Home Assistant Integration
• Attribution
• License

Usage

To interact with devices, you must pass async callback to Connection.run(callback: Callable[[DeviceCollection, Connection], Awaitable[Any]], interval: int) method. Callback will receive two arguments: devices: DeviceCollection that will contain all found supported devices and connection: Connection that represents current connection.

Second optional parameter interval, defines how often the callback will be called in seconds. If left unspecified, callback will be called every second.

You can find examples for each supported connection type below.

TCP

This is intended to be used with RS-485 to Ethernet/WiFi converters, which are readily available online or can be custom built using RS-485 to USB converter and ser2net software.

from pyplumio import TcpConnection
from pyplumio.devices import DeviceCollection

async def my_callback(devices: DeviceCollection, connection):
	# do something
	...

connection = TcpConnection(host="localhost", port=8899)
connection.run(my_callback, interval=1)

Serial

This is intended to be used with RS-485 to USB adapters, that are connected directly to the device running PyPlumIO.

from pyplumio import SerialConnection
from pyplumio.devices import DeviceCollection

async def my_callback(devices: DeviceCollection, connection):
	# do something
	...

connection = SerialConnection(device="/dev/ttyUSB0", baudrate=115200)
connection.run(my_callback, interval=1)

Shortcuts

It's also possible to use following shortcuts to create connection instance and instantly run it.

from pyplumio import tcp as pyplumio_tcp, serial as pyplumio_serial
from pyplumio.devices import DeviceCollection

async def my_callback(devices: DeviceCollection, connection):
	# do something
	...

pyplumio_tcp(my_callback, host="localhost", port=8899, interval=1)
# or
pyplumio_serial(my_callback, device="/dev/ttyUSB0", baudrate=115200, interval=1)

Data and Parameters

Data is separated into immutable data that can't be changed and parameters that can. Both can be accessed via instance attributes. (e. g. devices.ecomax.heating_temp, devices.ecomax.heating_target_temp)

Each ecoMAX controller supports different data attributes and parameters. You can check what your controller supports by calling print() on controller instance in device collection.

async def my_callback(devices: DeviceCollection, connection):
    if devices.has("ecomax"):
        print(devices.ecomax)

Reading

Interaction with the device is mainly done through device class instances inside your callback. For example you can read current feed water temperature by reading heating_temp attribute.

Passing my_callback function to Connection.run(callback: Callable[[DeviceCollection, Connection], Awaitable[Any]], interval: int) as demonstrated above, will print current feed water temperature every second.

async def my_callback(devices: DeviceCollection, connection):
    if devices.has("ecomax"):
        print(devices.ecomax.heating_temp)  # e. g. 61.923828125

Writing

You can easily change controller parameters by modifying their respective class attribute. In example below, we will set target temperature to 65 degrees Celsius (~ 150 degrees Fahrenheit) and close the connection.

async def my_callback(devices: DeviceCollection, connection):
    if devices.has("ecomax") and devices.ecomax.has("heating_target_temp"):
        """This will set target heating temperature to 65 degrees Celsius.
        and close the connection.
        """
    	devices.ecomax.heating_target_temp = 65
        connection.close()

Please note that each parameter has a range of acceptable values that you must check by yourself. The PyPlumIO library currently silently ignores out of range values. You can check allowed values by reading min_value and max_value attributes of parameter instance.

async def my_callback(devices: DeviceCollection, connection):
    if devices.has("ecomax") and devices.ecomax.has("heating_target_temp"):
        print(devices.ecomax.heating_target_temp.min_value)  # Prints minimum allowed target temperature.
        print(devices.ecomax.heating_target_temp.max_value)  # Prints maximum allowed target temperature.

Network Information

You can send network information to the controller that will be shown on it's display.

It's used for informational purposes only and can be skipped.

from pyplumio import TcpConnection
from pyplumio.devices import DeviceCollection
from pyplumio.helpers.network_info import WLAN_ENCRYPTION_WPA2

async def my_callback(devices: DeviceCollection, connection):
	# do something
	...

with TcpConnection(host="localhost", port=8899) as c:
    c.set_eth(ip="10.10.1.100", netmask="255.255.255.0", gateway="10.10.1.1")
    c.set_wlan(
        ip="10.10.2.100",
        netmask="255.255.255.0",
        gateway="10.10.2.1",
        ssid="My WIFI",
        encryption=WLAN_ENCRYPTION_WPA2,
        quality=100
    )
    c.run(my_callback)

Protocol

ecoNET communication uses RS-485 standard. Each frame consists of header (7 bytes), message type (1 byte), message data (optional), CRC (1 byte) and frame end delimiter (1 byte). The minimum frame size therefore is 10 bytes.

Protocol supports unicast and broadcast frames. Broadcast frames will always have their recipient address set to 0x00, while unicast messages will have specific device address. ecoMAX controller address is 0x45, ecoSTER panel address is 0x51.

Frame Structure

• Header:
  • [Byte] Frame start delimiter. Always 0x68.
  • [Unsigned Short] Byte size of the frame. Includes CRC and frame end delimiter.
  • [Byte] Recipient address.
  • [Byte] Sender address.
  • [Byte] Sender type. PyPlumIO uses EcoNET type 0x30.
  • [Byte] ecoNET version. PyPlumIO uses version 0x05.
• Body:
  • [Byte] Frame type.
  • [Byte*] Message data (optional).
  • [Byte] Frame CRC.
  • [Byte] Frame end delimiter. Always 0x16.

Requests and Responses

Frames can be split into requests, responses and messages. See requests.py, responses.py and messages.py for a list of supported frames.

For example we can request list of editable parameters from the controller by sending frame with frame type 0x31 and receive response with frame type 0xB1 that contains requested parameters.

Communication

ecoMAX controller constantly sends ProgramVersion[type=0x40] and CheckDevice[type=0x30] requests to every known device on the network and broadcasts RegData[type=0x08] message, that contains basic controller data.

Initial exchange between ecoMAX controller and PyPlumIO library can be illustrated with following diagram:

NOTE: device network address is listed in square brackets.

ecoMAX[0x45] -> Broadcast[0x00]: RegData[type=0x08] Contains basic ecoMAX data.
ecoMAX[0x45] -> PyPlumIO[0x56]:  ProgramVersion[type=0x40] Program version request.
ecoMAX[0x45] <- PyPlumIO[0x56]:  ProgramVersion[type=0xC0] Contains program version.
ecoMAX[0x45] -> PyPlumIO[0x56]:  CheckDevice[type=0x30] Check device request.
ecoMAX[0x45] <- PyPlumIO[0x56]:  DeviceAvailable[type=0xB0] Contains network information.
ecoMAX[0x45] -> PyPlumIO[0x56]:  CurrentData[type=0x35] Contains current ecoMAX data.

Versioning

Protocol has built-in way to track frame versions. This is used to synchronize changes between devices. Both broadcast RegData[type=0x08] and unicast CurrentData[type=0x35] frames sent by ecoMAX controller contain versioning data.

This data can be represented with following dictionary:

frame_versions: Dict[int, int] = {
  0x31: 37,
  0x32: 37,
  0x36: 1,
  0x38: 5,
  0x39: 1,
  0x3D: 40767,
  0x50: 1,
  0x51: 1,
  0x52: 1,
  0x53: 1,
}

In this dictionary keys are frame types and values are version numbers. In example above, frame Parameters[type=0x31] has version 37. If we change any parameters either remotely or on ecoMAX itself, version number will increase, so PyPlumIO will be able to tell that it's need to request list of parameters again to obtain changes.

frame_versions: Dict[int, int] = {
  0x31: 38,  # note version number change
  0x32: 37,
  0x36: 1,
  0x38: 5,
  0x39: 1,
  0x3D: 40767,
  0x50: 1,
  0x51: 1,
  0x52: 1,
  0x53: 1,
}

Home Assistant Integration

There is companion Home Assistant integration that is being co-developed with this package and depends on it. Click button below to check it out.

Attribution

Special thanks to econetanalyze project by twkrol for initial information about protocol.

License

This product is distributed under MIT license.