It depends on what you're trying to boost.
I wrote advertising data repeater that runs on another espruino board - it scans its surroundings and re-broadcasts what it found.
If you need connectable, I think it'd also be possible to establish multiple connections and stream the data through.
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.
It depends on what you're trying to boost.
I wrote advertising data repeater that runs on another espruino board - it scans its surroundings and re-broadcasts what it found.
If you need connectable, I think it'd also be possible to establish multiple connections and stream the data through.