./Electrum --testnet

"m/49'/1'/0'"

const transport = await TransportNodeHid.create();
const btc = new AppBtc(transport);
const result = await btc.getWalletPublicKey("m/49'/1'/0'");
console.log(result.getWalletPublicKey())

"m/49'/1'/0'"

Master Public Key: upub5EorGi4nr15AW.....
Receiving Address: 2NEYbAH7x6sXU2bS....

{
    publicKey:'049bd7786109d5bed56.....',
    bitcoinAddress: 'mtCKwjnNzNZr.....',
    chainCode:'c511f1afedb628fdb93299747604b...'
}