The local controller should continue a safe predefined mode, buffer readings where possible and clearly indicate that remote supervision is unavailable. Commands should have timeouts and sequence checks so an old instruction is not applied after reconnection.
The router can attempt staged recovery, switch WAN or SIM and send alerts through an alternate channel such as SMS. Once connectivity returns, the system should authenticate again, reconcile state and upload stored data in a controlled way. The behaviour belongs in the automation design; the router alone cannot decide what is safe for the process.
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What should an automation system do when the cellular connection is temporarily unavailable?
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