No worries. The system is designed to take into account the loss of communication to cloud. First, it sends you an alarm in a way you have specified (either an SMS, or email, or both). Second, the equipment at your home continues to operate as before. It does not receive new electricity prices and temperatures from cloud, but will operate sufficiently well with old values.
NOTE: Most importantly, no failure situation will leave your home without heating. Fault conditions have been designed “fail-safe”, with your heating always on. You just miss the best savings.