How to send a custom user Id from gateway to custom HTTP server

Hello, i use ruuvitag and ruuvi gateway for a project. I have build my own HTTP server. I need to assign to each gateway a custom number that can be add in each gateway broadcast, to link the gateway to an account on my database. it is possible ?

Hello, it’s not possible to add custom headers to HTTP message as of right now.

I would suggest linking the Gateways by their MAC addresses which is a part of their data payload