subscribe method
Implementation
Future<int> subscribe(Map<String, dynamic> subscribeInfo) async {
var jsonStr = jsonEncode(subscribeInfo);
final result =
await _api.subscribeInfoFromServer(jsonStr, ApiSeq.instance.getSeq());
if (result.param1 < 0) {
return Future.error(
XCloudAPIException(code: result.param1, commandId: result.commandId));
}
return Future.value(result.param1);
}