Homelab, Linux, JS & ABAP (~˘▾˘)~

[SAPUI5] Promisify an oData request

This is discussed for many years and unfortunately will not be implemented in the UI5 framework itself (see here). There are already different blogs describing how to build a wrapper for oData requests (for example here and here).

But with ES2024 it now got super simple to do this:

async function readData(model, entitySet) {
  const [promise, resolve, reject] = Promise.withResolver( )
  model.read(entitySet, {
    success: data => resolve(data),
    error: error => reject(error)
  return promise

const user = await readData(oDataModel, "/user")

[JavaScript] ES2023 Array methods

With ES2023 there are some new Array methods that always return a copy of the original array: toReversed, toSorted, toSpliced, with

const people = [
 { name: "Max", age: 19 },
 { name: "Tom", age: 65 },
 { name: "Liz", age: 43 },

// Copying counterpart of the reverse() method
const reversedPeople = people.toReversed()
// [{age: 43, name: "Liz"}, {age: 65, name: "Tom"}, {age: 19, name: "Max"}]

// Copying version of the sort()
const sortedPeople = people.toSorted((a,b) => a.age - b.age)
// [{age: 19, name: "Max"}, {age: 43, name: "Liz"}, {age: 65, name: "Tom"}]

// Copying version of the splice() method
const splicedPeople = people.toSpliced(1,1)
// [{age: 19, name: "Max"}, {age: 43, name: "Liz"}]

// Copying version of using the bracket notation to change the value of a given index
const updatedPeople = people.with(0, { name: "Pat", age: 12})
// [{age: 12, name: "Pat"}, {age: 65, name: "Tom"}, {age: 43, name: "Liz"}]

[Home Assistant] Offline detection for Zigbee2MQTT devices using the last_seen attribute

Activate the last_seen attribute via the Zigbee2MQTT interface. Go to Settings → Advanced → Last seen → Choose ISO_8601

Per default, the last seen sensor is disabled for all Home Assistant entities. To enable the last_seen attribute for all devices, add the following lines via VS Code in homeassistant → zigbee2mqtt → configuration.yaml

  legacy: false
        enabled_by_default: true

Now you must either restart Home Assistant or activate the entity manually: Go to Settings → Devices & services → Entities and adjust your Filter like this:

  • Integrations: Select “MQTT”
  • Status: Select “Disabled”

Then search for last seen, click on select all (right next to the filter button) and choose Enable selected in the context menu when clicking on the three dots in the top right corner.

Now the last_seen entity values should be visible, and you can use this new entity to detect an offline device. For example, by using this blueprint or by creating a template sensor like it is described here (related YT video). The template sensor can be put somewhere on your dashboard or used in an automation. Following the automation I’m using:

alias: Notify when zigbee device goes offline using last_seen
description: ""
  - platform: state
      - sensor.z2m_offline_devices
    from: null
    to: null
      hours: 0
      minutes: 10
      seconds: 0
condition: []
  - service: notify.mobile_app_mi_8
    metadata: {}
      title: |-
        {% if not states('sensor.offline_zigbee_devices') %}
          All Zigbee Devices Online!
        {% else %}
          The following Zigbee Devices are offline:
        {% endif %}
      message: "{{ states('sensor.z2m_offline_devices') }}"
mode: single

I also recommend excluding the last_seen sensors from the Logbook, because else the Logbook is flooded with changes. To do this, simply add the following lines in your configuration.yaml file:

      - sensor.*_last_seen

[Home Assistant] Get friendly name of the triggering device in an automation

In an automation, you can retrieve the friendly_name of the triggering device using:

{{ trigger.to_state.attributes.friendly_name }}

Helpful if an automation can be triggered by different devices (e.g. garage door 1 or garage door 2) and you want to send a notification that explicitly names the triggering device:

  - service: notify.ALL_DEVICES
      title: Garage open!
      message: >-
        {{ trigger.to_state.attributes.friendly_name }} is open

[JavaScript] Working with Promises in 2024

Since ES2024 there is a new way to create promises by using the withResolver function:

// ES 6 Via Constructor
const promise = new Promise((resolve, reject) => { }

// ES2024 Via factory function
const [promise, resolve, reject] = Promise.withResolver( )

Since ES2018 there is an additional handler called finally:

const promise = fetch("/myAPI")

  .then(response => console.log(response))
  .catch(error => console.error(error))
  .finally(() => console.log("Called in any case"))

And handling multiple Promises has been made easier by the new methods allSettled, any, race which were introduced in ES2020 and ES2015:

// Promise that resolves when all promises are resolved
const promise = Promise.all([promiseA, promiseB])
promise.then(([valueA, valueB]) => console.log(valueA, valueB))

// ES2020 Promise that resolves when all promises are settled (either resolved or rejected)
const promise = Promise.allSettled([promiseA, promiseB])

// ES2020 Promise that resolves when either promiseA or promiseB is resolved
const promise = Promise.any([promiseA, promiseB])

// ES2015 Promise that resolves/rejects when any promise is resolved or rejected
const promise = Promise.race([promiseA, promiseB])

[Home Assistant] Zigbee2MQTT device_class motion is now occupancy

After the last Zigbee2MQTT update to version 1.39.0, suddenly the motion sensors were missing in my auto-entities cards, which I use to display all motions sensors for specific areas.

type: vertical-stack
title: Bewegungsmelder
  - type: custom:auto-entities
      show_header_toggle: false
      title: null
      type: entities
      state_color: true
        - attributes:
            device_class: motion
            secondary_info: last-changed
          area: cellar
      method: last_changed
      reverse: true

When checking the changes included in the new Zigbee2MQTT version, I found the reason: https://github.com/Koenkk/zigbee2mqtt/pull/22896
With this pull request, the device_class is motion is replaced with occupancy. After changing the device_class in the auto_entities config, the motions sensors are displayed again.

Alternatively, you can switch the device_class back to motion, like it is described here. This would also bring back the old icon mdi:motion-sensor instead of mdi:home-outline.

[Android] Gadgetbridge

“Gadgetbridge is a free and open source Android application that allows you to pair and manage various gadgets such as smart watches, bands, headphones, and more without the need for the vendor application. So in short, you can use Gadgetbridge instead of relying on your gadget’s own proprietary app.”