Gather information to emulate an EME20

[Lightwars]

Hello,
I'm looking into writing back my surplus power to a nibe heatpump, so it can adapt to it.
Already known is address which is used by eme20 0xa4. Then there are could be some read/write tokens like 0x50, 0x60, 0x70.
If we answer 0x60 with something like 0xc0 0x60 0x06 0x00 0x00 0x00 0x00 0x"low byte power" 0x"high byte power" 0x"checksum" it gets displayed by the heatpump.

Have someone more insights or maybe can make a dump of the communication between the heatpump and an eme20?
This would be great.

[elupus]

In general, we would want to have parsers for the requests and responses for the communication hooked up here:

nibe/nibe/connection/nibegw.py

Line 705 in d900b70

ResponseTypes = {

So if you have log files or access to the pump via a gw start modifying that file and run the library on commandline on log files or against a gw and get it to parse the data correctly.

[Lightwars]

Have done some more testing with my setup writing and reading via mqtt.
So I think most things are somewhat known to get it working.

Thank you for your feedback.

[bj00rn]

Any code to share?

[Lightwars]

Hi,
I use my own code and haven't found enough time to get familiar with the lib, even though I have started to implement some bits.
Have a look here for some information, or the most crucial once, which get that feature going.

Some annoyances are communication errors with eme20, probably when solar power goes down to 0, I must test this further at the moment the smart home takes care of it an resets this alarm.

[bj00rn]

Sweet! Would be awesome to get this in the lib, annoying that they left out support for solar over modbus for the s-series pumps (except for sunspec compatible devices). Looking for ways to integrate my Ferroamp inverter.

[Lightwars]

Maybe it is easier for you to do something like this . Here someone sits an esp inbetween the inverter and the punp and emulate the sunspec registers, this was done with RS485 connection but should be makeable also via TCP/IP.

[bj00rn]

Maybe it is easier for you to do something like this . Here someone sits an esp inbetween the inverter and the punp and emulate the sunspec registers, this was done with RS485 connection but should be makeable also via TCP/IP.

Thanks! Yep, om that path too. Ferroamp broadcasts data on mqtt, i did an experimental adapter to create an sunspec device. Mapping the registers to ferroamp data is a guessing game though. Also it would be nice to know what sunspec models are being read by Nibe. Maybe your link can provide some insight.

[bj00rn]

@Lightwars for S-series (not sure about F) -> #256