The RGB LED includes a pin for each colour and a ground. Each colour pin was connected to a port on the NodeMCU:

A 470Ω resisters was used for each colour.

The pins were assigned to status definitions in the code to make it easier to set their status:

// PIN definitions
#define OWNER_STATUS_IN 0 // D3 = GPIO0
#define OWNER_STATUS_OUT 5 // D1 = GPIO5
#define OWNER_MESSAGE  12 // D6 = GPIO12

pinMode(OWNER_STATUS_IN, OUTPUT);
pinMode(OWNER_STATUS_OUT, OUTPUT);
pinMode(OWNER_MESSAGE, OUTPUT);

To set the LED to Owner Status IN mode, switch ON the desired colour and switch OFF the other colours.

digitalWrite(OWNER_STATUS_IN, 0); // switch off
digitalWrite(OWNER_STATUS_OUT, 1);
digitalWrite(OWNER_MESSAGE, 0);