An update campaign defines which device or devices receive a firmware update and the firmware image that is installed.
Note that devices that receive a manifest may reject the update if it does not match the compatibility fields or rules as defined in the manifest. This is to avoid firmware created for a specific model or for use by a particular vendor being updated on an incompatible or inappropriate device.
Tip: You may want to use the manifest tool to update a single device, or to upload the firmware and manifest to speed up the development cycle. See the manifest tool tutorial for details.