Below is information on the LEDs on the module. Each light provides information to you.
LED Info:
Solid Green Light: Connected through TCP.
Slow Blinking Green Light: IP address is assigned.
Fast Blinking Green Light: No IP address assigned.
No Green Light: NA

Solid Yellow Light: NA
Slow Blinking Yellow Light: NA
Fast Blinking Yellow Light: RX/TX Data Transfer
No Yellow Light: No activity.

Solid Red Light: NA
Slow Blinking Red Light: Associated, No internet detected.
Fast Blinking Red Light: Not associated.
No Red Light: Associated, Internet detected.