web3 encode smart contract data as payload

      it("testing data payload", async () => {
    const address = inbox.options.address;
    const abi = interface;

    // ganache account 0
    const account = "0x962E563Fed877b31fd5108bC27E330354fE8D3a4";

    const privateKey = Buffer.from(
      "3e7966932fba69ea323e8c9223ebecbc2ff06c6d46216577e3c853372d56b5e3",
      "hex"
    );

    const nonce = await web3.eth.getTransactionCount(account);
    console.log("​nonce", nonce);
    //   const data = web3.eth.contract(abi).at(address).inbox.message();
    // let inb = await new web3.eth.Contract(JSON.parse(interface), address );

    // const data = await inbox.methods.message();
    // const dataSigned =  data._method.signature;

    const messageCall = JSON.parse(abi)[1];
    console.log("​messageCall", messageCall);

    var signature = `${messageCall.name}(${messageCall.inputs.map(input => messageCall.type).join(",")})`;

    console.log("\n\n ​signature ||| ", signature);

    let signatureHash = web3.utils.sha3(signature);
    console.log("\n\n signatureHash ", signatureHash);

    signatureHash = substr_utf8_bytes(signatureHash, 0, 10);
    console.log("\n\n ​signature substr_utf8_bytes ||| ", signatureHash);

    // var signature = item.name + "(" + item.inputs.map(function(input) {return input.type;}).join(",") + ")";
    // var hash = web3.sha3(signature);
    // console.log('\n\n ​signature', item, '\n \n', signature, hash);
    
    let dataEncoded = signatureHash;// this can be with below function with web3


    dataEncoded = web3.eth.abi.encodeFunctionCall(messageCall);
    
    console.log('​\n\n dataEncoded', dataEncoded);
    
    const txParams = {
      from: accounts[0],
      to: address,
      nonce: nonce,
      gasPrice: web3.utils.toHex(web3.utils.toWei("10", "gwei")),
      gasLimit: 100000,
      value: "0x00",
      data: dataEncoded
      //EIP 155 chainId - mainnet: 1, ropsten: 3
      //   chainId: 3
    };

    const tx = new Tx(txParams);

    tx.sign(privateKey);
    let serializedTx = tx.serialize();
    console.log('​serializedTx', serializedTx);

    web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex'))
    .on('receipt 3333', console.log);
    
    // let sendRes = await web3SendTransaction({
    //   nonce: nonce,
    //   from: accounts[0],
    //   to: address,
    //   value: "0x00",
    //   gasPrice: web3.utils.toHex(web3.utils.toWei("10", "gwei")),
    //   gasLimit: 100000,
    //   data: dataEncoded
    // });
    // console.log('​sendRes', sendRes);
    
    // let receipt1 = await web3.eth.call({
    //   from: accounts[0],
    //   to: address,
    //   value: "0x00",
    //   data: dataEncoded
    // });
    // console.log('​\n\n receipt1111', receipt1);
    // const decodeP = web3.eth.abi.decodeParameter('string', receipt1);
    // console.log('​decodeP', decodeP);
    
    // let message = await inbox.methods.message().call();
    // console.log('​message', message);

    // web3.eth.sendTransaction({
    //   from: accounts[0],
    //   to: address,
    //   value: "0x00",
    //   data: dataEncoded
    // })
    // .on('transactionHash', function(hash){
    //     console.log('​hash', hash);
    // })
    // .on('receipt', function(receipt){
    //     console.log('​receipt', receipt);
    // })
    // // .on('confirmation', function(confirmationNumber, receipt){
    // //     console.log('​receipt', receipt);
    // //     console.log('​confirmationNumber', confirmationNumber);
    // // })
    // .on('error', (err) => {
    // console.log('​err', err);
    // });


    console.log('finish​');