Off the the top of my head, I'd say it's doable on nRF52. Other questions would that would guide one in selecting hardware:
Do you want to forward packets from LoRA, BLE, or both?
Are you connecting the gateway to the internet via Wi-Fi or Ethernet?
Do you want single-channel, or multi-channel forwarding?
Where is the gateway to be installed?
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Off the the top of my head, I'd say it's doable on nRF52. Other questions would that would guide one in selecting hardware:
Do you want to forward packets from LoRA, BLE, or both?
Are you connecting the gateway to the internet via Wi-Fi or Ethernet?
Do you want single-channel, or multi-channel forwarding?
Where is the gateway to be installed?