Bluetooth and App Inventor

I finished doing this project (https://corb.co/posts/rgbduino/) now I'm looking to build on it by adding another strip. However Im trying to gain individual control between the two strips so I'll be assigning each strip a 'L' or 'R'. I'm looking at PaulS' example code for packets and that seems to be where I wanna go with it. Something like<L,255,0,0> Im still not familiar with strtok() or atoi() yet so Im reading up on em..