I have been trying to figure out how to interact with whisper using web3. I have been able to successfully send (and receive) a message using geth console, but have been unable to do the same using web3.js.

Would you provide a short JavaScript snippet that successfully sends and receives a whisper message?

  • - what provider you are using? (web3.setProvider)? - what was the error when you were using web3.js? – Miao ZhiCheng Dec 3 '17 at 17:35

With Geth running, (I used geth --rinkeby --fast --cache=512 console --shh --rpc --rpccorsdomain '*' --ws --wsorigins '*'), and web3.js v1 in the browser, type into the browser console:

> web3.shh.setProvider("ws://localhost:8546") // must use websockets (read this on https://ethereum.stackexchange.com/a/34840/6014)
> web3.shh.newKeyPair().then(console.log) // logs key pair
> web3.shh.subscribe("messages", {privateKeyID: keyPair}, (err, msg) => console.log("msg received!", msg)) // returns subscription that will log the message when it's received
> web3.shh.getPublicKey(keyPair).then(console.log) // logs public key

> web3.shh.post({pubKey: publicKey, ttl: 10, payload: '0xffffffdddddd1122', powTime: 3, powTarget: 0.5}) // sends the message

This example works for Whisper v5: https://github.com/gballet/whisper-chat-example

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