Daniella, a medical assistant, was appointed to take care of a physically paralyzed patient at a ward. Daniella placed a smart wearable on the patient$$s wrist that sends alerts to Daniella$$s interfaced monitoring system $($mobile$)$ in case of an emergency during her inactive hours. One day, when Daniella was in the canteen, she received an emergency alert indicating that the patient$$s pulse was fluctuating. Which of the following types of IoT communication models was demonstrated in the above scenario?