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The long-awaited multi-device support is finally making its way to WhatsApp users, and while this is still an experimental feature available only to beta users, Facebook’s engineering team has finally made the announcement and even detailed the changes they made. have done and how this is one of the more complex features.
Previously, WhatsApp only used the main smartphone to connect; your primary phone was the encryption user. However, it also meant that the phone had to be available at all times, even when using companion devices like your computer to use WhatsApp web.
However, Facebook has now redesigned this system. WhatsApp’s latest architecture ensures that companion devices can act independently while maintaining sync with primary smartphones whenever possible.
WhatsApp’s multi-device support is a useful but limited feature
That’s what the Facebook engineering team had to say.
Multi-device WhatsApp uses a client-fanout approach, where the WhatsApp client sending the message encrypts and forwards it N number of times to N number of different devices – those in the sender’s and recipient’s device lists.
This new design will allow users to send messages or make calls from companion devices like their computers, even if their primary smartphones are turned off or disconnected.
Through this arrangement, WhatsApp will also be able to sync app data and message history across devices without relying on the central server. However, Facebook will store “a copy of every app state that all of someone’s devices can access” on a server for redundancy. Facebook said the data is “end-to-end encrypted with constantly changing keys known only to that person’s devices.”
Users are allowed up to four companion devices on their account, but you cannot have smartphones. This makes the feature unnecessary for people who want to use the same WhatsApp account on two smartphones.
As it is still in the beta phase, it is missing some main features. You won’t be able to see another user’s live location on a companion device, nor will you be able to call someone from the companion device if an older version of WhatsApp is installed. In addition, the management of group invitations is currently limited to the main smartphone. There are also limited functionality for Portal, WhatsApp Desktop, and WhatsApp Business users.
Multi-device support has been needed for some time now, although WhatsApp has not announced when this feature will finally be included in the stable releases. I am using the beta version of WhatsApp and currently cannot access this feature, but you can try it if you want.
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