[QUESTION] How to match DT_BITS to enum values

[escoand]

Sorry for not opening feature request or bug report, but hopefully somebody could help me anyway. I'm using only the BSB_LAN_defs.h file for my own project but this file is already a massive help, thanks

For me it's no clear how the DT_BITS units are translated to the actual enum values. I'm asking for this specific message:

src=0x80 dst=0x7f len=14 type=0x02 cmd=0x31000212 data=01:01:4D

which is in the commands table

{0x31000212,  CAT_TW,               VT_BIT,           1602,  STR1602,  sizeof(ENUM1602),     ENUM1602,     DEFAULT_FLAG, DEV_ALL}, // Status Trinkwasserbereitung

and in the units table

{VT_BIT,            1.0,    1, 1, DT_BITS, 0,  U_NONE, sizeof(U_NONE), STR_BIT},

Long story short, the value and bitmask resolves to

  00000001   = 0x01
& 01001101   = 0x4D
-------------------
= 00000001   = 0x01

but how is this matched to the specific enum value?

#define ENUM1602_00_02_TEXT "TWW-Push nicht aktiv"
#define ENUM1602_02_02_TEXT "TWW-Push aktiv"
#define ENUM1602_00_04_TEXT "TWW aus"
#define ENUM1602_04_04_TEXT "TWW an"
#define ENUM1602_00_08_TEXT "TWW Ladung nicht aktiv"
#define ENUM1602_08_08_TEXT "TWW Ladung aktiv"

[dukess]

Just an example on JavaScript

                 1* 2* 
#define ENUM1602_00_02_TEXT "TWW-Push nicht aktiv"
#define ENUM1602_02_02_TEXT "TWW-Push aktiv"
#define ENUM1602_00_04_TEXT "TWW aus"
#define ENUM1602_04_04_TEXT "TWW an"
#define ENUM1602_00_08_TEXT "TWW Ladung nicht aktiv"
#define ENUM1602_08_08_TEXT "TWW Ladung aktiv"

1* - value (state)
2* - bit mask

          var bitmask = 0;
          var bitvalue = parseInt(currentValueObject.value, 2); //Value, ex. from program number 1602
          for (var i = 0; i < sel.options.length; i++) { //we should read ENUM list value by value
            sel.options[i].selected = false; //clear selection flag
            var val = parseInt(sel.options[i].value); //value from ENUM
            bitmask = val & 0xff; //got valuable bit from ENUM value
            val = (val >> 8) & 0xff; //got state (zero or non-zero) for this ENUM value
            if((bitvalue & bitmask) == (val & bitmask)){ //comparison bitvalue with current ENUM value
              sel.options[i].selected = true; //set selection flag if it matched
            }

i.e., if we don't know the list of values, we won't be able to decode the value correctly.

[fredlcore]

First of all, maybe you tell us a bit about your project, because with the limited resources I have for the core project, I couldn't afford explaining all sorts of coding background if there is no return benefit for this project itself. Hope you can understand.

[escoand]

@fredlcore Of course, I do understand. I'm working with ESPHome and try to work with BSB with it. I started with creating something similar as the command table but now just use this one. I would never be able to collect all these commands. Thanks again.

@dukess Thanks for the code example, this helped a lot. I've seen currently these two different message and your are actually doing this, right?

### message 1
A*        B*        C*
0000_0001 0000_0001 0100_1101

                 1* 2*                                    1*      2*     C*           
#define ENUM1602_00_02_TEXT "TWW-Push nicht aktiv"     => 0x00 == 0x02 & 0100_1101   => true
#define ENUM1602_02_02_TEXT "TWW-Push aktiv"           => 0x02 == 0x02 & 0100_1101   => false
#define ENUM1602_00_04_TEXT "TWW aus"                  => 0x00 == 0x04 & 0100_1101   => false
#define ENUM1602_04_04_TEXT "TWW an"                   => 0x04 == 0x04 & 0100_1101   => true
#define ENUM1602_00_08_TEXT "TWW Ladung nicht aktiv"   => 0x00 == 0x08 & 0100_1101   => false
#define ENUM1602_08_08_TEXT "TWW Ladung aktiv"         => 0x08 == 0x08 & 0100_1101   => true

### message 2
A*        B*        C*
0000_0001 0000_0000 0100_0101

                 1* 2*                                    1*      2*     C*           
#define ENUM1602_00_02_TEXT "TWW-Push nicht aktiv"     => 0x00 == 0x02 & 0100_0101   => true
#define ENUM1602_02_02_TEXT "TWW-Push aktiv"           => 0x02 == 0x02 & 0100_0101   => false
#define ENUM1602_00_04_TEXT "TWW aus"                  => 0x00 == 0x04 & 0100_0101   => false
#define ENUM1602_04_04_TEXT "TWW an"                   => 0x04 == 0x04 & 0100_0101   => true
#define ENUM1602_00_08_TEXT "TWW Ladung nicht aktiv"   => 0x00 == 0x08 & 0100_0101   => true
#define ENUM1602_08_08_TEXT "TWW Ladung aktiv"         => 0x08 == 0x08 & 0100_0101   => false

And B* and C* value 0x80, 0x40, 0x20, 0x10 and 0x01 is just not known, right?

[fredlcore]

Interesting, what devices do you use for ESPHome? Does our adapter work with it or do you have to solder your own?

[escoand]

I'm still in a testing phase and connect without an adapter, and also just reading yet. Anyway I normally use Wemos D1 mini but it is too limited for the huge def file. So I switched to LOLIN32.

[dukess]

@escoand yep.

[fredlcore]

Ok, just FYI: Have a look at our license when using our code in case you want to use it in a commercial context (which would be prohibited).

[1coderookie]

@escoand Hi, could you please get in touch me via email and give me some informations about your project? Not only because it's interesting for us anyway which projects exists besides BSB-LAN, but especially for me as the author of the manual it would be nice to know, because sometimes users ask me about other possibilities to get access to the BSB besides the mentioned solutions within the manual, if they don't use any of the mentioned home automation systems. Thanks (Btw: I'm German - just in case you are also German..)