We defined a device with a number of sensors. If a sensor fails I get a SMS/Text message. If another sensor fails later I got another SMS. This results in too many SMS messages. I'd like this behavior: - If a sensor fails, the device is in error state, 1 SMS is send; - If another sensor fails, but the device already was in an error state NO sms should be send.
New SMS are only send again if device was okay again.