The documentation for the FlowFuse Device Agent can be found here

The FlowFuse Device Agent can be configured in 3 ways:

1. If started with no configuration file the Device Agent will start a Web Server that will allow a device.yml file to be uploaded locally to the Device. The device.yml is provided by the FlowFuse platform when the device is created.
2. A device.yml file provided when the Device is created in the FlowFuse platform. This file can be injected into the Belena devcie using the FF_DEVICE_YML environment variable (see below)
3. A group of Devices can be give a device.yml that contains a Provisionig Token. This will cause the Device to connect to the FlowFuse platform and register a new device, it will then download it's own unique device.yml file. The Provisioning token can be passed to the Belena device using the FF_DEVICE_YML environment variable (see below). Provisioning tokens are created on the Team -> Settings page, under the Device's tab. When using a Provisioning Token the Belena Device name will match the FlowFuse Device name.

Download either a Device configuration file or a Provisioning token and then Base64 encode this (with no line breaks) using the following command:

base64 -w 0 device.yml

In the Balena Fleet config set a Variable called FF_DEVICE_YML to the output of the base64 command.