OCPP Error Delta AC Max Smart

[Juljoo]

Hello everyone,

I have the Delta AC Max Smart Wallbox. After many attempts, I can get the wallbox into the system via OCPP, but I can't control the box. The following message appears

ocpp message (1723724021100): PropertyConstraintViolation - Field Call.Payload.MeterValue[0].SampledValue must be minimum 1, but was 0 for feature MeterValues ([2,"1723724021100","MeterValues",{"connectorId":1,"transactionId":0,"meterValue":[{"timestamp":"2024-01-28T08:48:15Z","sampledValue":[]}]}])

I was able to control the wallbox via Home Assistant and OCPP via WiFi, but not via EVCC.

I also cannot connect the wallbox as a sponsor via modbus: tcpip. Is this only possible via LAN? My box is currently still connected via WLAN.

Thank you very much!

Konfiguration (/etc/evcc.yaml)

## open evcc at http://evcc.local:7070
network:
  schema: http
  host: evcc.local # .local suffix announces the hostname on MDNS
  port: 7070

log: debug
levels:
  cache: error

# unique installation id
plant: *****

interval: 30s # control cycle interval

sponsortoken: *****

meters:
- type: template
  template: tibber-pulse
  usage: grid
  token: *****
  homeid: 59351176-9285-4638-96aa-***********
  name: grid1
- type: custom
  name: pv
  power:
   source: mqtt
   topic: Solarleistung
   timeout: 30s

chargers:
- name: wallbox3
  type: template
  template: ocpp
  stationid: 1

vehicles:
- type: template
  template: bmw 
  title: BMW  
  user: *****
  password: *****
  capacity: 67  
  name: ev2

loadpoints:
- title: Stellplatz
  charger: wallbox3
  mode: minpv

site:
  title: Zuhause
  meters:
    grid: grid1
    pv:
      - pv

tariffs:
  currency: EUR
  grid:
    # either
    type: tibber
    token: *****
    homeid: "59351176-9285-4638-96aa-*********" # optional if multiple homes associated to account

mqtt:
  broker: 10.1.1.249:1883
  topic: evcc # root topic for publishing, set empty to disable
  user: *****
  password: *****

Version: `0.129.0`

[pvdoda]

It works perfectly now with evcc 0.131.4 and the newest firmware 01.26.37.00.

If this firmware version is not available via the walbox app you can load it from here:
https://support.delta-es.com.au/knowledgebase/ac-max-firmware-library/
Always do a factory reset after firmware update.

My evcc config for the wallbox is:

chargers:
- name: delta_acmax
  type: template
  template: ocpp