Currently, our platform supports one device connection at a time per GUID that you specify on the connection API call.
In the near future, we will be rolling out support for multiple device connections, including the ability to prioritize data into the Strap platform.
As a workaround, you can pass a different GUID for the user to enable an additional platform connection.
For example, when a user connects, pass GUID-Fitbit to represent the user's Fitbit data in Strap. When the user attempts to connect Jawbone, pass GUID-Jawbone. Then, you can retrieve the user's data by platform from our API.