Read callback function is called before specified time interval

[luigiluz]

Describe the bug

I've tried using knot_data_config with a event flag of 10 seconds, it actually only sends data to cloud in a 10 seconds interval, but when I used minicom to check its log, I've discovered that it is calling the read callback function in a very short time interval.

To Reproduce
Steps to reproduce the behavior:
I've seen this using DHT11 example using KNoT Mesh board

1. knot clean
2. knot board mesh
3. knot make
4. knot flash
5. minicom

Expected behavior
I've expected to only see the callback function being called every 10 seconds.

Impact
The code works properly sending data every 10 seconds, but I think this shouldn't happen once it is only supposed to be called in a 10 seconds interval.

Screenshots or console output

Environment:

• OS: Ubuntu 18.04
• Zephyr KNoT SDK