VintageNet.OSEventDispatcher.UdhcpcHandler.renew

You're seeing just the callback renew, go back to VintageNet.OSEventDispatcher.UdhcpcHandler module for more information.
Link to this callback

renew(arg1, update_data)

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Specs

renew(VintageNet.ifname(), update_data()) :: :ok

Handle the renewal of a DHCP lease