same nonce value from etherjs provider

[katat]

For the payment in ledger nano, it needs provide nonce value to sign with the transaction. Currently the nonce value is getting from the etherjs provider.getTransactionCount(), which could return the same value due to the delay of the transaction confirmation in the network.

When sending the transactions with the same nonce to the network, it throws known transaction error from the etherjs for the last transaction broadcast attempt.

Have to figure out a way to avoid the same nonce issue.

May be helpful to take a look at the code in etherjs to see how it handles this issue for its sendTransaction function.