Best way to debug scripts

This tutorial will teach you how to quickly test your code without repacking your entire .apk and compiling it.

It’s gonna be fun to code when you learn this!

Steps:

1. Attach frida

   • Add frida gadget library to the lib/arch directory.
   • Load it in GameApp.smali (In newer versions it’s TitanApplication.smali and the "g" searching method won’t work in them. Check BSD Brawl and load your gadget under the "BSD" gadget loading).
   • Do not create .config.so file. Gadget will be automatically in listen mode and we’re going to use it.

2. Enable USB debugging

   • Enable USB debugging in settings. You can find tutorials online on how to do it, so I won’t explain it here.

3. Installing dependencies

   • Download node.js latest LTS version and install it (Make sure it’s going to add to the system PATH).
   • Create a new directory in your desired place (for example: Desktop). This is where our project will be.
   • Open cmd.exe in the directory location and type this:

     npm install frida

     This will install frida node.js package on your PC
   • [OPTIONAL] If you want to quickly create script type this in cmd.exe:

     echo. >script.js

     This will create script.js file in your working directory.

4. Install ADB

   • Install ADB (Android Debugging Bridge), there’s plenty of tutorials on the internet, I’m sure you’ll install it on your own.

5. Loading the script

   • Plug in your phone with USB cable to the PC
   • Allow USB debugging.
   • In cmd.exe type:

     adb devices

     It will try to connect to your phone via the bridge.
   • Press Allow on the phone.
   • Now open Brawl Stars with the frida gadget in it. It will be stuck on the black screen until you start the script
   • To start the script in cmd.exe type:

     frida -U Gadget -l script.js

   • Your script will start executing and you can modify the script in runtime!