Handling offline micro-controllers is an important consideration for your back-end interface. There are different approaches you can take depending on the specific requirements of your application. Here are a few suggestions:

    Timeouts: One option is to use timeouts to determine when a micro-controller has gone offline. You can configure a timeout period for each micro-controller, and if the system doesn't receive a message or response from that micro-controller within the timeout period, it can mark it as offline. You can then update the database accordingly to reflect the offline status of the micro-controller.

    Heartbeat messages: Another approach is to have each micro-controller send regular heartbeat messages to the back-end system. These messages can be sent at regular intervals, and if the back-end system doesn't receive a heartbeat message within a certain time frame, it can mark the micro-controller as offline. This approach requires more communication overhead but can be more accurate in detecting offline micro-controllers.

    Redundancy: To ensure the system can handle offline micro-controllers without disruption, you may want to consider adding redundancy to your system. For example, you can have multiple micro-controllers for each group, and if one goes offline, the others can continue to communicate and keep the group operational. This can be achieved by using a load balancer or similar technology.

Regardless of the approach you choose, it's important to have a mechanism in place for detecting and handling offline micro-controllers to ensure the system remains reliable and functional.
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