VEBus

This library is used to work with an ESP32 Arduino (not for the AVR family as the library uses std::vector).

Built With

• [Arduino IDE 2.3.2]
• [Visual Studio 2022 and visual micro]

Dependencies

arduino-esp32 boardlibrary >= 2.0.8 for < 2.0.8 undefine UART_MODE_RS485 in the vebus.h file

//#define UART_MODE_RS485
#ifdef UART_MODE_RS485
#include "hal/uart_types.h"
#endif

Getting Started

This is a sample guide for setting up your project locally.

Hardware

• ESP32 Board
• RS485 IC

The RS485 IC can be a MAX485 or max1348

Tip

For a simple start (PlugAndPlay) you can use an esp32 arduino board with integrated RS485 LILYGO T-CAN485

Software

There are a few examples to get you started with the library

• ReadWriteSettings This example is a minimized program for reading out some settings on a Multiplus-II 12/3000

• VebusSniffer This example can be used to listen to all traffic on the VE.BUS.

• ReadAllVariableInfos This example can be used to read all variable information. This is necessary to interpret the value sent by the VE.BUS device. If you have a device, it is not in the library. Send me the serial output to integrate the new device.

Function descriptions

• Callback for received messages
• Callback for response messages
• Write a value to Multiplus
• Read a value to Multiplus

Callback for received messages

void SetReceiveCallback(std::function<void(std::vector<uint8_t>& buffer)> cb);

To parse all received messages, the callback can be used as follows

*.ino

void Receive(std::vector<uint8_t>& buffer)
{
    _vEBus.DestuffingFAtoFF(buffer);
    Serial.printf("Res: ");
    for (uint32_t j = 0; j < buffer.size(); j++) Serial.printf("%02X ", buffer[j]);
    Serial.println();
}

void setup()
{
	_vEBus.SetReceiveCallback(Receive);
}

Tip

If you don't want to see some messages, you can skip them using a blacklist or use the whitelist to see specific messages.

VEBus::Blacklist _blacklist[] = { {.value = 0xE4, .at = 4}, {.value = 0x55, .at = 4} };

void setup()
{
	_vEBus.SetReceiveCallback(Receive, _blacklist, sizeofarray(_blacklist));
}

Callback for response messages

void SetResponseCallback(std::function<void(ResponseData&)> cb);

To parse all response messages, the callback can be used as follows. data.id is specified by the query to indicate that it is the response of the read operation.

*.ino

void Response(VEBus::ResponseData& data)
{
	if(requestId == data.id){}
	if(WinmonCommand == data.command && Settings == data.address){}
    //...to some stuff
}

void setup()
{
	_vEBus.SetResponseCallback(Response);
}

Write a value to Multiplus

uint8_t WriteViaID(RamVariables variable, int16_t rawValue, bool eeprom = false);
uint8_t WriteViaID(RamVariables variable, uint16_t rawValue, bool eeprom = false);
RequestResult WriteViaID(RamVariables variable, float value, bool eeprom = false);

uint8_t WriteViaID(Settings setting, int16_t rawValue, bool eeprom = false);
uint8_t WriteViaID(Settings setting, uint16_t rawValue, bool eeprom = false);
RequestResult WriteViaID(Settings setting, float value, bool eeprom = false);

To write a value, you have three ways to send it. You can store a value to a non-volatile memory. To do this you need to set the eeprom true

Caution

Be careful when repeatedly writing EEPROM (loop) EEPROM writes are limited

• library supported device with value interpretations

*.ino

void loop()
{
	if(dataToWrite == true)
	{
		_vEBus.WriteViaID(Settings::IMainsLimit, 7.2); //set 7.2A
	}
}

• no library supported device with value interpretations

*.ino

void setup()
{
	_vEBus.ReadInfo(Settings::IMainsLimit);
}

void loop()
{
	if(dataToWrite == true)
	{
		_vEBus.WriteViaID(Settings::IMainsLimit, 7.2); //set 7.2A
	}
}

• raw without value interpretations

*.ino

void loop()
{
	if(dataToWrite == true)
	{
		_vEBus.WriteViaID(Settings::IMainsLimit, 72); //set 7.2A
	}
}

Read a value to Multiplus

uint8_t Read(RamVariables variable);
uint8_t Read(Settings setting);

To read a value

*.ino

void loop()
{
	if(dataToRead == true)
	{
		uint8_t requestId = _vEBus.Read(Settings::IMainsLimit);
	}
}

Supported devices with value interpretations

• Multiplus-II 12/3000

To do lists

• add more integrated devices

Known issues

• VENUS::Write() is currently not working. (Use VENUS::WriteViaID() instead)
• extract more GX commands

License

This project is licensed under the GNU General Public License v3.0 or later - see the LICENSE.md file for details

Acknowledgments

• [Hadmut] (https://www.mikrocontroller.net/topic/561834)
• [pv-baxi] (https://github.com/pv-baxi/esp32ess)