{ pkgs ? import <nixpkgs> { } }:
let

  myPython = pkgs.python3.withPackages (python-packages:
    with python-packages; [
        paho-mqtt
    ]);

  startServer = pkgs.writers.writeBashBin "start-server" ''
    ${myPython}/bin/python ./main.py
  '';

in pkgs.mkShell {

  buildInputs = with pkgs; [
    myPython
    startServer
  ];

}