Hi,
aha you meant the alt_alarm mechanism. I thought from your post, that you found the solution, that you have to reset the watchdog periodically in that data sheet
But thanks anyway.
But there have to be a way to stop that watchdog, that's not really a practical solution.
BTW: On alt_alarm usage:
The function which calls alt_alarm also increments the ntick counter, which you can read by alt_nticks(), this counter does not count up as long as the alt_alarm callback function is running.
I had this problem when i tried to measure system time with this alt_ntick and saw it driftign away. So just keep that in mind.