Battery-powered IoT solar-powered sensors are great for remote placement and data reporting, but can be tricky to update, since they spend most of their lifetime in deep sleep mode, and off the network. Code sample can be found here! https://www.omgthecloud.com/esphome-w...

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Leveraging MQTT with retain flags, you can wake your IoT device from sleep on its' next cycle, perform your updates, and put it back in its' deep-sleep cycle. This is an elegant way of handling remote management of IoT devices without any need for physical intervention. Check it out! Additionally, we're going to cover how to use a secrets file in ESPhome to keep your passwords and other sensitive configuration points out of your firmware file.