virtual OCStackResult SubscribeDevicePresence(OCDoHandle* handle,
const std::string& host,
const QueryParamsList& queryParams,
OCConnectivityType connectivityType,
ObserveCallback& callback) = 0;
virtual OCStackResult SubscribeDevicePresence(OCDoHandle* handle,
const std::string& host,
const QueryParamsList& queryParams,
OCConnectivityType connectivityType,
ObserveCallback& callback) = 0;