local ota = {}

-- Called when a device requests an OTA update.
-- Return nil for default behavior (upgrade if local version > current version).
-- Return {allow = false} to deny.
-- Return {allow = true} to use local image.
-- Return {allow = true, url = "http://..."} to download remote image.
function ota.onOtaRequest(device, currentVersion, localVersion, localPath,
                          mfr, imgType)
    log_info("ota request:")
    log_info("mfr : 0x" ..  string.format("%04X", mfr) .. ", imgType : %x" .. string.format("%04X", imgType))
    log_info("version : 0x" .. string.format("%08X", currentVersion))
    return nil
end

-- Called before starting OTA transfer.
-- Return true to proceed, false to abort.
function ota.onUpdateStart(device, image)
    log_info("OTA start: " .. device.friendly_name)
    log_info("Manufacturer: 0x" .. string.format("%04X", image.manufacturer))
    log_info("ImageType: 0x" .. string.format("%04X", image.imageType))
    return true
end

-- Called after OTA completes or fails.
function ota.onUpdateEnd(device, success)
    if success then
        log_info("OTA done: " .. device.friendly_name)
    else
        log_info("OTA failed: " .. device.friendly_name)
    end
end

return ota