generating and sending an extrinsic using ws

gistfile1.txt

        // send a transaction
        let nonce = 0;
        let tx = Transfer {
            amount: 42,
            nonce,
            from: AccountKeyring::Alice.into(),
            to: AccountKeyring::Bob.into(),
        };
        let signature = AccountKeyring::from_public(&tx.from).unwrap().sign(&tx.encode()).into();
        let xt = Extrinsic::Transfer(tx, signature).encode();
        let mut xthex = hex::encode(xt);
        xthex.insert_str(0, "0x");
        let jsonreq = json!({
            "method": "author_submitAndWatchExtrinsic",
            "params": [xthex], // params,
            "jsonrpc": "2.0",
            "id": self.id.to_string(),
        });
        println!("sending extrinsic: {}", jsonreq.to_string());
        self.out.send(jsonreq.to_string()).unwrap();