How to get Homewizard P1 meter telegrams into DSMR Reader using automations

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This post describes how you can get Homewizard P1 meter telegrams from your DSMR smart meter into DSMR Reader using Home Assistant automations and scripts.
Until now I have been using a Raspberry Pi and a P1 USB cable to retrieve the smart meter telegrams.
In 2025 I hope to install a Homewizard plug-in battery. A Homewizard P1 meter is then necessary.

(I have also instructions how to send Homewizard P1 telegrams to xirixiz/dsmr-reader-docker using DSMR Reader plugins. Let me know if you are interested)

Introduction

Homewizard P1 telegrams can be sent to DSMR Reader as follows:

We will use only Home Assistant REST commands to do the integration.

What you need

  • working instances of
    • Home Assistant
    • DSMR Reader
  • a Homewizard P1 meter
    • plugged into your smart meter
    • already configured and visible in the Homewizard Energy app
    • local API enabled
  • IP address Homewizard P1 meter
  • IP address DSMR reader
  • API key DSMR Reader

REST commands

In your Home Assistant configuration.yaml file create the following REST commands

rest_command:
  get_hw_p1_telegram:
    url: "http://{{ip}}/api/v1/telegram"
    method: get

  dsmr_push_telegram:
    url: "http://{{ip}}/api/v1/datalogger/dsmrreading"
    method: post
    payload: "telegram={{telegram}}"
    headers:
      "Authorization": "Token {{ api_key }}"
      "Content-Type": "application/x-www-form-urlencoded"

Script to get a Homewizard raw P1 telegram

Create the following script

alias: Get Homewizard P1 telegram
sequence:
  - service: rest_command.get_hw_p1_telegram
    data:
      ip: "{{ip}}"
    response_variable: response
  - stop: rest command executed
    response_variable: response
fields:
  ip:
    selector:
      text: null
    name: ip
    description: IP address Homewizard P1 meter
    required: true

You can use this script in Developer Tools / Services to check if you can get a telegram successfully.

Script to poll and process a P1 telegram

Create a Home Asssistant script
In the code below:

  • replace 1.2.3.4 with the IP address of your Homewizard P1 meter
  • replace 6.7.8.9:7777 with the correct IP and port of your DSMR Reader
  • replace your_api_key with the DSMR Reader API key
alias: Process P1 telegram
sequence:
  - service: script.get_homewizard_p1_telegram
    data:
      ip: 1.2.3.4
    response_variable: result
  - choose:
      - conditions:
          - condition: template
            value_template: "{{ result.status == 200 }}"
        sequence:
          - service: rest_command.dsmr_push_telegram
            data:
              ip: 6.7.8.9:7777
              telegram: "{{ result.content }}"
              api_key: your_api_key
            response_variable: ret
            enabled: true
  - stop: end of script
    response_variable: result

Automate the process

Create an automation to fetch a telegram.
DSMR v4 meters publish a new telegram (with electricity information) every 10 seconds (use a trigger of /10).
DSMR v5 meter update every second (use a trigger of /1).

alias: Process Homewizard P1 Telegrams
description: ""
trigger:
  - platform: time_pattern
    seconds: /10
condition: []
action:
  - service: script.process_p1_telegram
    response_variable: response
mode: single
1 Like
2

Would this work without HA? I would prefer a standalone solution.

3

@elRadix the Docker solution uses a Python script which is called inside DSMR Reader. The solution is scattered around various pages. I will try to write a post next week which summarizes everything

4

Here is the page that helped me. Part of the instructions is in Dutch HomeWizard P1 As Remote for DSRM-Reader · Issue #301 · xirixiz/dsmr-reader-docker · GitHub