Build a Custom Command
You can build your own command simply by extending the Command class and implementing the getApdu and parseResponse methods.
Then you can use the sendCommand method to send it to a connected device.
This is strongly recommended over direct usage of sendApdu.
Check the existing commands for a variety of examples.
export class MyCustomCommand
implements Command<MyCustomResponse, MyCustomCommandArgs>
{
args: GetAddressCommandArgs;
constructor(args: GetAddressCommandArgs) {
this.args = args;
}
getApdu(): Apdu {
// Main args for the APDU
const getEthAddressArgs: ApduBuilderArgs = {
cla: 0xe0, // Command CLA
ins: 0x02, // Command INS
p1: 0x00, //Parameter P1
p2: 0x00, //Parameter P1
};
//Add the data attache to the APDU with the builder
const builder = new ApduBuilder(getEthAddressArgs);
builder.add32BitUIntToData(0);
... // Add more data to the APDU
return builder.build();
}
parseResponse(
response: ApduResponse,
): CommandResult<GetAddressCommandResponse> {
//Create Apdu Parser
const parser = new ApduParser(response);
// FIRST: check status word
if (!CommandUtils.isSuccessResponse(response)) {
return CommandResultFactory({
error: GlobalCommandErrorHandler.handle(response),
});
}
// Extract fields from the response
const customAttributes1 = parser.extract8BitUInt();
if (customAttributes1 === undefined) {
return CommandResultFactory({
error: new InvalidStatusWordError("Public key length is missing"),
});
}
... // Extract more fields from the response
return CommandResultFactory({
MyCustomResponse: {
customAttributes1,
customAttributes2,
...
},
});
}
}