Req: Plain EMS Messaging via MQTT

[sysrun]

Hi,

your code works quite good on my Buderus (BC10/RC35)

I am trying to implement more functionality (Like Party-Mode etc) into the code. For that, it would be awesome to have a "raw" functionality:

• Send a raw HEX String (like "0B103F910101") without CRC via a MQTT Topic The Code is the adding the CRC32 and send it to the Bus
• Get raw Telegrams: Publish the raw incoming telegrams as HEX to a specific MQTT Topic

Is it possible to add this functionality?

Cheers, Frederik

[proddy]

Both should be simple to implement but I need more requirements

• what is the exact format of the message (i.e. all headers or just data)?
• what kind of data is in this message?
• what message types would you want published to the MQTT Topic via the code?
• how frequent should these messages be sent?
• how should the code respond and decypher an incoming raw message?

if you're looking to send commands to the EMS there are probably easier ways to do specific to the functionality you're are looking for.

[sysrun]

Awesome :)

Exact format would be "[src] [dest] [type] [offset] [data]" as HEX - like "0B103F910101" - the ESP (Your code) would then add "[crc] " and push it to the Bus. I think the ESP do no't have to be aware about the data, its just for trying different commands. So IMHO we don't need a re-send logic here. Just fire and forget.

On the other hand, if the "debug mode" is enabled, the ESP should just pipe the incoming BUS data to a special MQTT Topic - no check, no decoding, just the plain data as HEX

My point for that is: Its easier for me to try thing on the bus - instead of Uploading new code every time (whichs sometimes does not work over OTA so i have to down into my cellar...)

Sidenote: I am experimenting with the EMS since several years now and build the HW and a NodeJS decoder myself :) Now i got BBQKEES ready-to-go circuit and i want to use your code instead of a Raspberry ;)

[sysrun]

Idea 2 would be some kind of Telnet <-> Bus bridge-mode

[proddy]

ok, probably using telnet is easy then and not bother with mqtt.

So for sending how about a command from telnet that takes a parameter and sends this as a valid telegram ([data] [crc]) to the ems bus. Fire and forget. If anything comes back it'll be echo'd in the 'verbose' logging mode. What that work?

[sysrun]

Yeah, i think that would work :) CRC is calculated by the ESP?

How would the reply be logged? Is it possible to get a "raw" log-mode? No colors, no text, just data (with a newline at the end)

[proddy]

yes CRC is calculated by the code. Raw log mode is easy to add too - what needs to be shown, all telegrams from all devices on the bus?

[sysrun]

Nice :)

Yeah just the dirty raw data coming in: "11 22 33 44 55 66 .. ..\n" - thats it :)

Maybe it would not be a new log-mode but a dedicated "Bridge" mode which can be activated.

[sysrun]

What i imagine is something like this:

• Telnet to the stick
• Send "br" - Bridge-Mode will be activated:
  • No Logoutput anymore, just raw HEX-Strings of Telegrams coming in
  • To Send data: "send 001122334455" (not sure if a send prefix would be needed)
• Send another "br" to exit the Bridge-Mode - resume normal ops

[proddy]

I've added raw mode. I'll work on the send piece later after I've figured out this darn Nefit Easy

[sysrun]

Awesome :) Do you have a dedicated branch for testing?

[proddy]

no, when I've added the send logic from telnet I'll upload the new version. I see you've dabbled in coding, why not contribute yourself and do a pull request?

[sysrun]

Happy to contribute new functionalities later - i tried to implement the above logic myself - well, C is really not my home-turf :(

[proddy]

Raw mode supported. Let me know if it works for you. To use, set the logging to Raw and then use the 'r' command

[sysrun]

Awesome! :) Thank you!

I already tried to implement the RC35 - it's a bit complicated because we need to issue two queries: One for the mode and one for the state (temperatures)

[proddy]

you always need 2 queries, same with RC20 and RC30. I can do the coding for you , but no idea if it'll work.

[proddy]

I'll close this issue as it related to the Raw mode I implemented. Can you open a new issue for RC35 support and then'll see how I can help you remotely.