What is the time code in debug messages?

[bgunnarb]

Hi!
What does the timecode that starts every debug message mean?
This is what I can see on the serial monitor:

149852 !TSF:SND:TNR
150855 MCO:SLP:MS=600000,SMS=0,I1=0,M1=3,I2=255,M2=255
150859 !MCO:SLP:TNR
160861 MCO:SLP:MS=590000
160863 MCO:SLP:TPD
160865 MCO:SLP:WUP=-1

[mfalkvidd]

@bgunnarb it is the milliseconds counter on the node.

[bgunnarb]

Follow-up question:
Does the millisecond counter advance when the node sleeps as in:

sleep(INTERRUPT, RISING, SLEEP_TIME);

It does not seem so (which is fine, just want to know)

[mfalkvidd]

@bgunnarb correct, the counter is frozen during sleep.