Connecting to ChirpStack Gateway Bridge

I have two gateways

  1. TTIG
  2. Raspberry Pi

I would like to connect them to ChirpStack Server. For the TTIG, I have been searching around and I couldn’t find anything, only that it’s not possible in an easy way, as it needs to be hacke. Is there any tutorial for that?

For the second one I have successfully connected to TTN, but not sure how to connect it to ChirpStack, but not sure how to connect it to ChirpStack. Is there any tutorial for that as well?

Thanks