perform method Null safety
Implementation
void perform(String action, [Map<String, dynamic>? params]) {
if(state == HotlineSubscriptionRequestState.suspended) return;
final actionParams = {'action': action, 'id': 1};
subscriptionManager.connection.socketChannel.sink.add(
jsonEncode({
'identifier': identifier,
'command': 'message',
'data': jsonEncode(actionParams),
})
);
}