Plejd component for Home Assistant

This is a simple Plejd component for Home Assistant, interfacing with the bluetooth le protocol.

Getting started

Tested platforms

This component has been tested on the following platforms:

• Raspberry pi 3b+ running hassbian (Bluetooth 4.2 Cypress CYW43455 chip)
• Intel NUC NUC7i7BNH (Bluetooth 4.2 Intel 8265) running ESXi 6.7 and linux guest

Requirements

• A bluetooth adapter that supports Bluetooth Low Energy (BLE)
• Obtaining the Plejd crypto key and the device ids.

Gathering crypto and device information

Obtaining the crypto key and the device ids is a crucial step to get this running, for this it is required to get the .site json file from the plejd app on android or iOS.

Steps for android:

1. Turn on USB debugging and connect the phone to a computer.
2. Extract a backup from the phone:

$ adb backup com.plejd.plejdapp

3. Unpack the backup:

$ dd if=backup.ab bs=1 skip=24 | python -c "import zlib,sys;sys.stdout.write(zlib.decompress(sys.stdin.read()))" | tar -xv

4. Recover the .site file:

$ cp apps/com.plejd.plejdapp/f/*/*.site site.json

Steps for iOS:

1. Open a backup in iBackup viewer.
2. Select raw files, look for AppDomainGroup-group.com.plejd.consumer.light.
3. In AppDomainGroup-group.com.plejd.consumer.light/Documents there should be two folders.
4. The folder that isn't named ".config" contains the .site file.

Gather cryto key and ids for devices

When the site.json file has been recovered the cryptokey and the output addresses can be extracted:

1. Extract the cryptoKey:

$ cat site.json | jq '.PlejdMesh.CryptoKey' | sed 's/-//g'

2. Extract the outputAddresses:

$ cat site.json  | jq '.PlejdMesh.outputAdresses' | grep -v '\$type' | jq '.[][]'

These steps can obviously be done manually instead of extracting the fields using jq and shell tricks.

Installing component

Hassbian:

Make sure to have bluepy installed in your python environment. Bluepy comes with a helper called bluepy-helper, to allow scanning for devices this has to be given additional capabilities:

$ sudo setcap 'cap\_net\_raw,cap\_net\_admin+eip' /srv/homeassistant/lib/python3.5/site-packages/bluepy/bluepy-helper

Run this as a custom component, put the files light.py, manifest.json and __init__.py in custom_components/plejd in your configuration.yaml add something like:

light:
  - platform: plejd
    crypto_key: !secret plejd
    devices:
      11:
        name: bedroom
      13:
        name: kitchen_1
      14:
        name: kitchen_2
      16:
        name: bathroom

HASS.IO Docker container

Hass.io default installation script will map /usr/share/hassio/homeassistant to the /config directory inside the docker container. create a custom_components directory if it doesn't exist (it doesn't by default).

mkdir -p /usr/share/hassio/homeassistant/custom_components

Checkout the git repo and rename folder

cd /usr/share/hassio/homeassistant/custom_components
git checkout https://github.com/klali/ha-plejd.git
mv ha-plejd plejd

Update your configuration.yaml file

light:
  - platform: plejd
    crypto_key: !secret plejd
    devices:
      11:
        name: bedroom
      13:
        name: kitchen_1
      14:
        name: kitchen_2
      16:
        name: bathroom

Last step is to restart homeassistant service, in the homeassistant web ui, go to Configuration -> General -> Server management and hit restart.

License

Copyright 2019 Klas Lindfors <klali@avm.se>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.