Can IoT devices receive remote software updates? How do OTA (Over-The-Air) updates work in this process, what protocols and security layers are used? How are updates transferred to the device's memory, and what kind of rollback mechanisms are available in case of a failed update? What do you know about this topic, and what are your experiences?
How do OTA updates work on IoT devices?
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In IoT devices, signed firmware encrypted via TLS over MQTT or HTTPS is received, and if the bootloader fails verification, it automatically rolls back to the previous image. When I implemented OTA updates for my home temperature sensor, I was relieved that failed updates were automatically restored.