Meaning
Wireless delivery methods allow for the remote installation of new firmware or software onto a deployed hardware asset. Using over the air updates removes the need for physical access to a device via a cable or a specialized port. This capability is standard for smart meters, vehicles, lighting controllers and industrial sensors.
It allows for the rapid deployment of security patches.
Update Mechanism
The process begins with the device checking a central server for a signed package. When over the air updates occur, the system downloads the data in small blocks to avoid saturating the radio link. It then verifies the hash of the file to ensure no corruption happened during the transfer.
Version Control
Manufacturers must keep a record of which firmware is running on every unit in the field. Effective over the air updates rely on a database that maps hardware revisions to compatible software versions.
Safety Protocol
Power failure during a flash write can permanently disable a product. To prevent this, over the air updates often require a minimum battery level or a connection to a permanent power source. The system usually keeps a backup of the previous firmware to allow for a recovery if the new installation fails.
This redundant approach ensures that the device remains functional even after an interrupted transfer.
