https://matrix.org/docs/guides/whatsapp-bridging-mautrix-whatsapp

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Bridging Matrix with WhatsApp running on a VM

Matrix is:

    an open standard for interoperable, decentralised, real-time
    communication.

In this article we'll benefit from all three of these attributes:

  * interoperable: we'll see how Matrix can be made to interact with
    WhatsApp
  * decentralised: you can perform this on your own server while
    still enjoying the benefits of being connected to the rest of the
    Matrix federation
  * real-time communication: we'll see how to send and receive
    messages in real-time

 Install your homeserver and install mautrix-whatsapp, the WhatsApp
bridge

Firstly, you need to have a Matrix homeserver installed. If you don't
currently have one, take a look at the instructions at Installing
Synapse, and also in the Synapse README.

Next, install mautrix-whatsapp by following the instructions at
mautrix-whatsapp/wiki.

If you are starting from scratch, I suggest you take a look at
matrix-docker-ansible-deploy, as this project will enable you to
deploy Synapse, mautrix-whatsapp and other components easily.

For example, if you have an existing deployment using
matrix-docker-ansible-deploy, you can add mautrix-whatsapp simply by
adding the following line to your configuration file:

matrix_mautrix_whatsapp_enabled: true

... and re-running the setup:

ansible-playbook -i inventory/hosts setup.yml --tags=setup-all

Either way, you will soon have a functioning Matrix Synapse
homeserver and mautrix-whatsapp installed with it. Next, we will set
up an Android VM.

 Set up an Android VM

The best way to run an Android Virtual Machine is to use the Android
Studio tools from Google. First, install Android Studio, making sure
to follow the post-install steps, as they will install additional
tools we need, including AVD Manager.

Once installed, run AVD manager by choosing Tools -> AVD Manager from
the menu.

Follow the steps to create a new virtual machine, in this example I
have a Nexus 5X running Android 9, but almost any configuration is
fine here. Make sure that you give the device access to the Play
Store.

[avd]

 Install WhatsApp and sign-in

Launch the Virtual Device, the open the Play Store and sign in. Now
use the Play Store to install WhatsApp on the Virtual Device.

You will be asked to verify your phone number, use your number on
another device to complete this step.

                              [nexus5]

 Setup mautrix-whatsapp bridge

Now that you have WhatsApp working in a VM, and Matrix working on
your server, it's time to bridge them togther!

Per the instructions at mautrix-whatsapp/wiki, you must start a new
chat with @whatsappbot:yourdomain>. Type login to begin the
authentication process.

mautrix-whatsapp operates by using the WhatsApp Web feature of
WhatsApp - which means it uses a QR code that you must now scan on
the device running WhatsApp - which in your case is the AVD. In order
to scan the presented QR code, set your AVD camera to passthrough the
camera device on your host machine - see the images below.

[camera1] [camera2]

Once this is complete, you can type sync, to start bridging contacts,
and sync --create to automatically create room invites.

And that's it! You may need to take a little time to watch the sync
happen, particularly if you have a very large number of chats on the
WhatsApp side, but there is no further configuration needed.

 Demo!

Contents

Install your homeserver and install mautrix-whatsapp, the WhatsApp
bridge
Set up an Android VM
Install WhatsApp and sign-in
Setup mautrix-whatsapp bridge
Demo!
---------------------------------------------------------------------

Other Guides

Introduction

Introduction
How can I get involved?
The Matrix Jobs Room
Application Services
Made for Matrix Badge Guidelines
Moderation in Matrix
Running online events with Open Source communication tools

Server Setup

Installing Synapse
Free Small Matrix Server

Encryption

End-to-End Encryption implementation guide
Implementing more advanced e2ee features, such as cross-signing

Client-Server API

Usage of the matrix-js-sdk
Migrating from Client Server API v1
Client Server API
Using Matrix to make Chatbot software from the 1960s available in
2018
Client Developers' Guide to Supporting SSO
Creating a simple read-only Matrix client
Usage of matrix-bot-sdk
matrix-bot-sdk Room Admin Features
Usage of matrix-nio (Python Matrix client library)

Bridging

Types of Bridging
Bridging Matrix with WhatsApp running on a VM

Homeserver Development

State Resolution v2 for the Hopelessly Unmathematical
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