Definition: rgb_led(value) — Allowed: numeric expression; Not allowed: string argument.
Sets the status RGB LED using a 3-bit mask (value & 0x07): bit0=R, bit1=G, bit2=B.
0 off1 red2 green3 yellow (red+green)4 blue5 purple (red+blue)6 cyan (green+blue)7 white (red+green+blue)rgb_led(1); // red
rgb_led(3); // yellow
rgb_led(0); // off