Resol VBus support
Method one: VBusDecoder sketch via Arduino and sending data via HTTP GET requests to Domoticz
There are many solar, system and heating controllers sold by the German brand Resol®.
Popular models are derivatives of the DeltaSol® and DeltaTherm® range. Some controllers are also built for and sold by other brands.
They all have a kind of a serial port with a protocol called VBus®.
The controller usually sends out multiple types of datagrams, of which one in particular is very useful.
It contains a list with all the current values of all sensors, pumps and switches. It might also count the total heat production.
Now there is a way to acquire and convert all the data the controller outputs via this port and send the values to Domoticz.
You need some additional hardware to get this to work.
-Wiznet 5100 Ethernet shield
-VBus to UART converter
The first two are of the shelf boards. The VBus to UART converter is a circuit you need to build by yourself. One of the possible working schematics is the following: click
After building the hardware you possibly need to add your own controller to the list.
All the code and further instructions can be found on GitHub.
Forum topic: click
Method 2: VBus to Pi and decoding via Python script
If the VBus to UART converter is coupled to a RS232-USB converter, the data can be read by the Pi. With a Python/LUA script and the necessary conversions the data can be sent to Domoticz directly. This has not been done yet.
Method 3: VBus to Resol DL2 Datalogger and readout via LUA
See this topic You can add a Resol DL2 Datalogger and read out the logger via local IP with a LUA script.