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Mystery optical(?) connector

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alyy:
I made some progress :)
Built a crude IR RTX device using SFH 7250, diode, 2 resistors and USB-UART (TTL) cable. It works!
Found original software somewhere deep in the internet archives.
Quite a few curse-words while installing software made in XP & Vista times onto Win10 machine.
But, at the end, I got it up and running! Software connects to the heat pump, reads data and config is possible.
Now I have collected a few samples of communication using a com port sniffer.
Next task is analyze the data and build a small controller board using ESP32 to read statuses, temperatures and select operation modes.
Task a bit further down the line is MQTT or Home-Assistant integration.

alyy:
If anyone needs more information on this topic, I was able to build a simple optical interface and windows software that reads parameters from the Stiebel Eltron and compatible heat pumps. Tested on WPM2.

My GitHub project

Clubazur:
Hi alyy,

Great work. I am a pretty good Home Assistant user and I would like to integrate my SE WPM.  Unfortunatly I am on the beginning road to integrate this. First step, can you please give me a clue where to find the ComfortSoft 3.5 Software?
AFAK, all Legacy links are dead now. Plan is to use esphome / MQTT and custom esp32 infrared Interface. Maybe you can help me for this first step.

Thanks

alyy:
Hi, thanks for interest in my work.
It would be great if you can test my project from the Github. Link is above and here. It has all the essentials of the ComfortSoft in a small package. Also great for diagnosing the cable and connectivity to the WPM control box.
When you get this up and running, I can share my copy of the ComfortSoft together with instructions on how to install it onto the modern Windows machine. It originates from the Win XP era :)
Do you have WPM or WPM2 control box?
Do you already have the IR cable?

I like your idea to use ESPHome as a bridge between HA and UART port. I am not yet familiar with both of them, so my question is, how and where do you plan to encode and decode data packets for the heat pump? Will that be a custom code in the ESP or in HA? How do you make visuals for such a custom device in HA?

I currently don't have the HA yet, therefore I am running my monitoring software on a tiny PC in the boiler room :)
Plan is to migrate to HA at some point..

Clubazur:
Hi alyy,

I don't have an IR cable yet. If you can share a schema, or give me an hint where to buy, would be great. I have to find out first more about the protocol and how "heavy" it is. Plan is to decode this on a ESP32 device (c/arduino on PlatformIO), first step will be a MQTT sensor device for Home Assistant. But first I need the cable. I have an WPF 13 (2003!) running with the IR option in front of the controller.

Thanks.

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