What does the blue and green LEDs mean on my U30-GSM logger?

There is a simple science behind the blue and Green LED light on the U30 GSM logger. Here is an explanation in exact order.

Blue:

The first 8-12 blinks are a boot up sequence. This is normally a steady blink but can vary a little bit. This is the time when the SIM card wakes up.

Single blinks – this means the logger is calling.

Double blinks – the call made it to Hobolink…

Green:

Green LED – this is communications within the logger that is controlled by in outside source like Hobolink or Hoboware. If you see this LED, the logger is receiving commands