Node Red flows to call termux api on Android devices.
How to install NodeJS on Android https://medium.freecodecamp.com/building-a-node-js-application-on-android-part-1-termux-vim-and-node-js-dfa90c28958f#.pzbrth56q
and after:
npm install -g --unsafe-perm node-red
Termux API: https://termux.com/add-on-api.html