Auto sync to Fitbit?

From fitbit docs:

Using HTTPS

Fitbit requires Transport Layer Security protocol - TLSv1.2 for the subscriber endpoints. TLS+SNI is not supported. Self-signed certificates and all versions of SSL are also not supported.

From Espruino docs:

Right now you must use HTTPS (HTTP is not supported).

Which makes it seem to me like it could very well work. Don't know if the requirements listed on fitbit are too narrow or not.

I suspect you will have a better answer from someone else soon.