respond method
Implementation
void respond({
int to = 1,
int result = 1,
int id = 2,
MessageCallback? callback,
}) {
channel!.sink.add(
json.encode(
response(
to: to,
result: result,
id: id,
),
),
);
if (!isListening) {
isListening = true;
channel?.stream.listen(callback ?? onMessage);
}
}