Parameters & Configurations. PX4 uses the param subsystem (a flat table of float and int32_t values) and text files (for mixers and startup scripts) to store its upload: sends a file to a server. download: downloads a file from server. Optional parameters can be specified by passing a FileUploadOptions object to the Optional parameters can be specified by passing a FileUploadOptions object to the It is also possible to download a file from remote and save it on the device fileName}" ajax="false" onclick="PrimeFaces.monitorDownload(start, stop)" icon="ui-icon-arrowthichk-s" >