Reverse a BLE device to integration into Home-Assistant

by kalle | Feb 15, 2026 | Hacking, Home-Assistant

Found the YouTube video How To Reverse Engineer A Bluetooth Device and started to follow it but it did not really work as expected so record all differences here.

• The HCI snoop log were not available in \FS\data\misc\bluetooth\logs but rather in \FS\data\log\bt.
• The bluetooth device was disabled on my Raspberry Pi 3, needed to run the following commands
  sudo rfkill unblock all<br />sudo hciconfig hci0 up
• Scan for the device: sudo hcitool lescan | grep "C7:57"

Running temporary Home-Assistant on my laptop

by kalle | Jun 2, 2025 | Hacking, Home-Assistant

Wanted to experiment a bit with Home-Assistant while travelling. And wanted to be able to run as much as possibly locally on the laptop instead of connecting to my home setup since network connectivity is not always reliable.

So here is a short summary how I set it up.

Docker Desktop

I already had Docker Desktop setup with a free Docker Personal account. If you do not have it setup already, download and install it.

HomeAssistant and MQTT

I found these two articles; Installing Docker, Home Assistant and Portainer on Ubuntu Linux and Configuring the Mosquitto MQTT Docker container for use with Home Assistant but they are dedicated to run Docker on Linux and since my laptop is a Mac I had to do some modifications.

Home Assistant

Create a folder on your laptop. I called mine home-assistant and then a number of subfolders in it:

mkdir home-assistant
cd home-assistant
mkdir homeassistant
mkdir homeassistant/config

Then run code docker-compose.yml and add

version: '3.0'
services:
  homeassistant:
    container_name: homeassistant
    image: "ghcr.io/home-assistant/home-assistant:stable"
    volumes:
      - ./homeassistant/config:/config
      - /etc/localtime:/etc/localtime:ro
      - /run/dbus:/run/dbus:ro
    restart: unless-stopped
    privileged: true
    ports:
      - 8123:8123

Mosquitto

Optionally if you want to run Mosquitto for MQTT

mkdir mosquitto
mkdir mosquitto/data  
mkdir mosquitto/logmkdir mosquitto/config

Then run code mosquitto/config/mosquitto.conf and add

persistence true
persistence_location /mosquitto/data/
log_dest file /mosquitto/log/mosquitto.log
listener 1883

## Authentication ##
allow_anonymous true

And add to docker-compose.yml

  mosquitto:
    image: eclipse-mosquitto
    container_name: mosquitto
    volumes:
      - ./mosquitto:/mosquitto
      - ./mosquitto/data:/mosquitto/data
      - ./mosquitto/log:/mosquitto/log
    ports:
      - 1883:1883
      - 9001:9001    

Start container/s

Then start the the container or containers with docker compose like

docker-compose up -d

Configure login to mosquitto

You now have both Home Assistant and Mosquitto running but before connecting the two you want to setup authentication in Mosquitto. This is just a simple setup with only one account.

In Docker Desktop, view your containers by clicking Containers in the left menu. Find the mosquitto one and click on its name. Then select the Exec tab and execute the following command

mosquitto_passwd -c /mosquitto/config/password_file hass

Enter the password you want twice.

Then edit the /mosquitto/config/mosquitto.config in VSCode and change the following section

## Authentication ##
allow_anonymous true

to

## Authentication ##
allow_anonymous false
password_file /mosquitto/config/password_file

Then restart the mosquitto docker to reload this config.

Connect Home Assistant to Mosquitto

Then visit localhost:8123 to create account and start using Home-Assistant.

Click Setting in the left menu once you have logged in. Then click Devices & services.

Click “Add Integration” and type MQTT. Select MQTT and then click MQTT(the top alternative). You should see something like

Fill in all fields like in this example

And click Submit. Now you have added your Mosquitto instance to Home Assistant!

Alternatives to get Nexa support in Home Assistent

by kalle | Apr 28, 2024 | Hacking, Home-Assistant

I found the OpenMQTTGateway project and got really interested since it can open up for a lot of interesting integrations to Home Assistant. I bought a LilyGo to start experimenting and could get it to read 433Mhz devices like Nexa. All this is possible due to the RTL_433_ESP library.

I wanted also to be able to write to the devices since I have several power plugs that use Nexa. That is not possible with just the LilyGo and the radio module on it. With the STX882 it should be possible to transmit. So I bought both a STX882 and a SRX882. This page describes how to connect these to a ESP32 or NodeMCU.

Have not yet tried to make the full setup and connect everything. Will update this post once I have tried that.