invalid sender when sending a transaction using prepareforpaymentcall

[DrasiusMajere]

I'm using a solidity contract version 0.5.0 and infura for sending transactions. The function is not payable
for this reason I'm using EtherAmount.zero() parameter

E/flutter (16270): RPCError: got code -32000 with msg "invalid sender".
E/flutter (16270): #0 JsonRPC.call (package:web3dart/src/io/jsonrpc.dart:47:4)
E/flutter (16270):
E/flutter (16270): #1 Web3Client._makeRPCCall (package:web3dart/src/web3client.dart:29:30)
E/flutter (16270):
E/flutter (16270): #2 Web3Client.sendRawTransaction (package:web3dart/src/web3client.dart:177:10)
E/flutter (16270): #3 FinalizedTransaction.send. (package:web3dart/src/transaction.dart:112:18)

[maxholman]

@DrasiusMajere Are you using ropsten?

I just submitted PR #16 that will allow you to specify a chainId for transactions. I was getting this same error using infura/ropsten.

[DrasiusMajere]

Yes, I'm testing and obviously using ropsten....
Thank you for the support because I'm a newbie in ethereum
But I hope this package will be updated to the solidity 0.5.0

[maxholman]

The PR will allow you to specify a chainId like this, that should solve the invalid sender error.

transaction.prepareForSimpleTransaction(
  new EthereumAddress("0x[...]"), // your target address 
  EtherAmount.fromUnitAndValue(EtherUnit.finney, 300)
).send(ethClient, chainId: 3);

[DrasiusMajere]

It's working.
Now to send a transaction that calls a function that alters state variables is possible.

[ishwarchandratiwari]

The PR will allow you to specify a chainId like this, that should solve the invalid sender error.

transaction.prepareForSimpleTransaction(
  new EthereumAddress("0x[...]"), // your target address 
  EtherAmount.fromUnitAndValue(EtherUnit.finney, 300)
).send(ethClient, chainId: 3);

i had a same issue invalid sender when sending a transaction,
your snippet worked, but how can i get Transaction id ?

[DrasiusMajere]

Actually send method return the transaction Id as a list of bytes, if you want an hexadecimal id more readable. I found a function that uses web3dart called bytesToHex.
var tranId = bytestoHex(await transaction.prepareForSimpleTransaction( new EthereumAddress("0x[...]"), // your target address EtherAmount.fromUnitAndValue(EtherUnit.finney, 300) ).send(ethClient, chainId: 3));

Maybe it would be recommended divide the code above in smaller parts.

[ishwarchandratiwari]

Actually send method return the transaction Id as a list of bytes, if you want an hexadecimal id more readable. I found a function that uses web3dart called bytesToHex.
var tranId = bytestoHex(await transaction.prepareForSimpleTransaction( new EthereumAddress("0x[...]"), // your target address EtherAmount.fromUnitAndValue(EtherUnit.finney, 300) ).send(ethClient, chainId: 3));

Maybe it would be recommended divide the code above in smaller parts.

i am getting error
The method 'bytestoHex' isn't defined for the class 'main'.

[DrasiusMajere]

import 'package:web3dart/conversions.dart';

What IDE are you using? because you can leave the IDE looks for the appropriate library that contains that function and add the import statements automatically.