Whisper–communication protocol for DApps

Whisper is a communication protocol for DApps, which they use to communicate with each other. There are various use cases in which a communication protocol like Whisper is essential. With the help of this protocol, applications like chat rooms can be built on Ethereum.

In this recipe, you will learn more about the Whisper protocol.

Getting ready

You need to have knowledge of Ethereum network setup and usage to get the best out of this recipe. You can learn more about these initial configurations in Chapter 1, Getting Started. 

Whisper is still in the development stage and is not yet recommended for production applications.

How to do it…

1. Whisper uses the shh protocol to send messages between DApps. In Web3JS, you can directly access the object from the root:

web3.shh

2. Create a new identity using the shh object. Call the newIdentity function to do this:

var identity = web3.shh.newIdentity();

3. Use the post method to broadcast the messages:

web3.shh.post({
    //...