Problem with setup and no API response

[Dahmspiegel]

Hi everyone,
I ran into some issues while setting things up and hope somone has an idea or did run in the same issues. I do realy not know what to test further. I'm relatively new to this project and working with these systems in general, so it's quite possible that my issue is caused by something simple that I just haven't figured out yet.
I'm grateful for any help or hints you can offer — thanks a lot in advance!

Description of my issue

I flashed the ESP with the provided software. I have MQTT disabled, cause form my understanding we are using the API. I can access it via the browser, and the /api/version endpoint responds correctly. However, the other API endpoints do not seem to work:

XXX ~ % curl HeidelBridge/api/version
{"version":"3.0.0","build_date":"Mar 16 2025"}%

XXX ~ % curl HeidelBridge/api/vehicle_state
This resource does not exist%

XXX ~ % curl http://192.168.178.158/api/is_vehicle_connected
This resource does not exist%

Additionally, I tried integrating it into EVCC, but I get the following error during startup:

Using config file: /config/evcc.yaml
starting evcc: 'EVCC_DATABASE_DSN=/data/evcc.db evcc --config /config/evcc.yaml'
[main  ] INFO 2025/04/28 11:18:50 evcc 0.203.4
[main  ] INFO 2025/04/28 11:18:50 using config file: /config/evcc.yaml
[db    ] INFO 2025/04/28 11:18:50 using sqlite database: /data/evcc.db
[main  ] INFO 2025/04/28 11:18:50 listening at :7070
[main  ] FATAL 2025/04/28 11:18:50 charger [heidelberg_ec] cannot create charger 'heidelberg_ec': cannot create charger type 'template': cannot create charger type 'daheimladen-mb': current limit: modbus: exception '225' (unknown), function '3'

In the EVCC web UI, the following error is displayed:

Error during startup. Check your configuration and restart.
charger: [heidelberg_ec] cannot create charger 'heidelberg_ec': cannot create charger type 'template': cannot create charger type 'daheimladen-mb': current limit: dial tcp 192.168.178.158:502: connect: connection refused

My config.yaml is set up exactly as described in the documentation:

chargers:
  - name: heidelberg_ec
    type: template
    template: daheimladen-mb
    host: 192.168.178.158 # IP address or hostname
    port: 502 # Port (optional)

loadpoints:
  - title: Heidelberg EC
    charger: heidelberg_ec
    mode: off
    guardduration: 5m

Other than that, the config is empty, but I believe that's not the problem since I also get errors directly in the terminal.

##Additional Information
I have double-checked the board setup and wiring, and everything looks good based on the instructions. I also measured the connections to confirm.

Here are some additional notes about the setup:

• The S4 pin 4 (not visible in the picture) and S6 pin 2 are set to ON; all other DIP switches are OFF.
• From my breadboard, a brown and a yellow/green wire are connected via WAGO clamps to the black and green wires (please don't be confused by the colors in the pictures).

Thank you very mutch for your help.