How do you conduct maintenance if your products are distributed across the world?

Our sensors and gateways have been designed for 10-15 years of maintenance-free operation. Since our devices are run entirely on solar power, traditional maintenance - for example, having to change batteries - is not required. Both the gateways and the sensors support firmware-updates-over-the-air (FUOTA) which enables us to remotely update the embedded software and avoid any need to manually upgrade or update the devices.