Help & Guides

CampMatic Box

This is the CampMatic box — compact, pre-wired and ready to install.

Locate the bench seat

The bench seat in the VW Grand California, under which the service compartment is located. This is where the CampMatic box will be installed.

Remove seat cushion

The seat cushion is attached with hook-and-loop tape. Simply lift it off — no tools needed.

Unscrew wooden panel

After removing the cushion, the screws of the wooden panel become visible. Remove all screws and lift the panel.

Open Truma cover

Locate the cover over the Truma heater (marked with arrow and "open" label) and remove it.

Connect RJ11 plug

Insert the CampMatic RJ11 plug into the right free socket on the Truma heater.

Unscrew control panel (CP Plus)

The Truma CP Plus control panel is secured with 3 screws. Remove all screws and carefully flip the panel.

Connect CampMatic box

On the back of the control panel, disconnect the red 12V power plug. Insert it into the female JST-PH connector of the CampMatic box. Then plug the male JST-PH connector of the box into the Truma control panel. The CampMatic box is essentially connected in-line with the existing power supply.

Reattach control panel

Reattach the control panel with the 3 screws. Then wait 3 minutes for the CampMatic box to start up.

Perform reset

In the Truma control panel menu, navigate to Reset → PR SET and start the reset.

Verify CampMatic detection

After the reset, check the Index menu for a new (third) entry. It must show T23.000 — then the CampMatic box is detected and ready. If not, perform the reset again.

Prepare SIM card

Before the 4G CampMatic box can be used, a SIM card must be inserted.

Important: The SIM card must not have a PIN lock. Otherwise the box cannot register on the mobile network. How do I disable the PIN lock?

Open the box while powered off

Disconnect the CampMatic box from power before opening. Open the case carefully: the GSM antenna is mounted on the lid and connected to the board by a cable. Lift the lid slowly and without pulling on the antenna cable.

Open the SIM slot

The SIM card holder is located on the board. Slide the metal lock in the direction of the arrow (see image) to unlock the holder, then carefully flip it up.

Insert SIM & close the box

Insert the SIM card with the contacts facing down (watch the beveled corner). Close the holder and slide the lock against the arrow direction until it clicks. Carefully reattach the lid — do not pinch the antenna cable — and screw the case shut.

Power on CampMatic Box & wait

Reconnect the box to power and wait approx. 3 minutes until the device has booted up and registered on the mobile network.

Connect to CampMatic Access Point

On 4G devices the access point is always active — no WiFi configuration is required. Connect your smartphone or laptop to the CampMatic WiFi network. The password is on the sticker on the CampMatic box or in the CampMatic app on the status page.

Open local control panel

Open http://192.168.4.1/ in your browser. Log in with username admin and the password from the sticker or CampMatic app. The Truma control panel is shown locally — the 4G box talks to the CampMatic cloud directly over cellular, independent of any local WiFi.

Get credentials from the Status page

Log in at campmatic.de/app and open the Status page. The "MQTT Bridge (Home Assistant)" card shows: host (always campmatic.de), port (8883, TLS), username (e.g. campmatic_003), password (eye icon reveals), and topic prefix (e.g. campmatic/003). These values replace every <placeholder> below.

Set up the MQTT integration in Home Assistant

Settings → Devices & Services → Add Integration → MQTT. Broker: campmatic.de, port: 8883, username/password from the Status page, SSL/TLS on, certificate validation "Auto" (system trust store). No CA file upload — the broker uses a public TLS certificate that HA trusts out of the box.

When to prefer the bridge over direct?

Direct is fine for one single device on a HA instance with stable internet. For multiple CampMatic devices or frequent WAN dropouts, the local bridge (see the "Bridge" tab) is the only practical option — HA entities stay available even when the cloud link is briefly down.

Check auto-discovery

After successful MQTT setup, entities appear automatically under names like climate.grand_california_<NNN>_truma_heizung. A finished Lovelace dashboard can look like this — climate card on top, stats chips in the middle, 24-hour graph below, plus water control, energy mix and a status board:

Room heater — climate card with chips and 24 h graph

The polished variant: control card on top, chip row of live status values, 24-hour temperature trend at the bottom. Requires the HACS cards Mushroom, stack-in-card and mini-graph-card. Replace <NNN> with your device number.

type: custom:stack-in-card
mode: vertical
keep:
  background: false
  border_radius: true
cards:
  - type: custom:mushroom-climate-card
    entity: climate.grand_california_<NNN>_truma_heizung_2
    name: Raumheizung
    show_temperature_control: true
    hvac_modes:
      - "off"
      - heat
    collapsible_controls: false
    fill_container: true

  - type: custom:mushroom-chips-card
    alignment: center
    chips:
      - type: template
        icon: mdi:fire
        content: "{{ states('sensor.grand_california_<NNN>_truma_heizmodus_2') }}"
        icon_color: >-
          {% if is_state('binary_sensor.grand_california_<NNN>_truma_heizung_aktiv_2','on') %}
          orange{% else %}disabled{% endif %}
      - type: template
        icon: mdi:thermometer-check
        content: "{{ states('sensor.grand_california_<NNN>_truma_soll_raumtemperatur_2') | round(0) }} °C"
        icon_color: amber
      - type: template
        icon: mdi:lightning-bolt
        content: "{{ states('sensor.grand_california_<NNN>_truma_elektrische_leistung_2') }} W"
        icon_color: >-
          {% if is_state('binary_sensor.grand_california_<NNN>_truma_elektro_aktiv_2','on') %}
          yellow{% else %}disabled{% endif %}
      - type: template
        icon: mdi:fuel
        content: "{{ states('sensor.grand_california_<NNN>_truma_energiemix_status_2') }}"
        icon_color: >-
          {% if is_state('binary_sensor.grand_california_<NNN>_truma_diesel_aktiv_2','on') %}
          deep-orange{% else %}disabled{% endif %}
      - type: template
        icon: mdi:check-network
        content: ""
        content_info: none
        icon_color: >-
          {% if is_state('binary_sensor.grand_california_<NNN>_truma_cp_plus_alive_2','on') %}
          green{% else %}red{% endif %}

  - type: custom:mini-graph-card
    name: Temperaturverlauf (24 h)
    icon: mdi:thermometer-lines
    hours_to_show: 24
    points_per_hour: 4
    line_width: 3
    smoothing: true
    show:
      icon: true
      name: true
      labels: true
      extrema: true
      average: true
      fill: fade
      legend: true
      points: false
    entities:
      - entity: sensor.grand_california_<NNN>_truma_raumtemperatur_2
        name: Raum
        color: "#FF7A00"
      - entity: sensor.grand_california_<NNN>_truma_soll_raumtemperatur_2
        name: Soll
        color: "#FFC107"
        show_state: true
        y_axis: secondary

Water heater — 3-button selector (Off / 40 °C / 60 °C)

The Truma water heater only supports off / 40 / 60. Three chips replace the slider and highlight the active value:

type: custom:mushroom-chips-card
alignment: center
chips:
  - type: template
    icon: mdi:water-off
    content: Aus
    icon_color: >-
      {% if state_attr('climate.grand_california_<NNN>_truma_wasser',
        'temperature') | float(99) == 0 %}red{% else %}disabled{% endif %}
    tap_action:
      action: call-service
      service: climate.set_temperature
      target:
        entity_id: climate.grand_california_<NNN>_truma_wasser
      data:
        temperature: 0
  - type: template
    icon: mdi:thermometer-low
    content: 40 °C
    icon_color: >-
      {% if state_attr('climate.grand_california_<NNN>_truma_wasser',
        'temperature') | float(0) == 40 %}orange{% else %}disabled{% endif %}
    tap_action:
      action: call-service
      service: climate.set_temperature
      target:
        entity_id: climate.grand_california_<NNN>_truma_wasser
      data:
        temperature: 40
  - type: template
    icon: mdi:thermometer-high
    content: 60 °C
    icon_color: >-
      {% if state_attr('climate.grand_california_<NNN>_truma_wasser',
        'temperature') | float(0) == 60 %}red{% else %}disabled{% endif %}
    tap_action:
      action: call-service
      service: climate.set_temperature
      target:
        entity_id: climate.grand_california_<NNN>_truma_wasser
      data:
        temperature: 60

Energy mix selector

A compact card for the Gas / Electric / Mix selector:

type: custom:mushroom-entity-card
entity: select.grand_california_<NNN>_truma_energiemix
name: Energiemix
icon: mdi:fuel
icon_color: deep-orange
fill_container: true

Hiding entities

Hide just in one dashboard: omit the card. Hide everywhere in HA: Settings → Devices & Services → MQTT → device → entity → gear icon → "Disable entity". The entity is not deleted on the device side, only hidden in HA.