Unable to send ether using send function

How to send ether using below code

its skipping at - transaction.send(password: password)

let value: String = "1.0" // In Ether
let walletAddress = EthereumAddress(wallet.address)! // Your wallet address
let toAddress = EthereumAddress(toAddressString)!
let contract = web3.contract(Web3.Utils.coldWalletABI, at: toAddress, abiVersion: 2)!
let amount = Web3.Utils.parseToBigUInt(value, units: .eth)
var options = TransactionOptions.defaultOptions
options.value = amount
options.from = walletAddress
options.gasPrice = .automatic
options.gasLimit = .automatic
let tx = contract.write(
    "fallback",
    parameters: [AnyObject](),
    extraData: Data(),
    transactionOptions: options)!


let password = "web3swift"
let result = try! transaction.send(password: password)

[hakumai-iida]

There is another transaction with same nonce in the queue

I think you got this error because you issued a new transaction before the transaction was processed（A nonce is like a transaction processing number).

If the gas price is too low, the transaction will be pending and will not be processed at worst. Try a larger gas price.

Let’s review the terms.

1.GAS is a unit price to exec something on EVM. ex) “ADD” op-code takes 3 GAS.

2.GAS PRICE is the price of Ethereum for 1 GAS, and the value considers gwei as the unit price. (gwei = GIGA wei = 1,000,000,000 wei)

ex) if you apply gas price as 10gwei, “ADD” op-code wastes 3*10gwei.

3.GAS LIMIT is the maximum amount of GAS that you can consume during a transaction, and the default value is 21,000

ex) if the gas limit is 21,000, “ADD” op-code can be processed 7,000 times.

As a test　i tried the codes on kovan with “.automatic”, the gas price was “11000000000”. So kovan network recommends 11gwei for the gas price.

Also i tried “9000000000”(9gwei), the transakuction was processed.

I hope this helps. (I’m sorry for strange English)

[hakumai-iida]

I’m glad your code was working. And i appolgize my reply was crossed.

how to get previous nonce to do next transaction ? like need to increase nonce right so

I think the blockchain will automatically number it, so I don’t think you need to specify it manually.