Add functionality: Fetch time from NTP server

[SBlechmann]

Hey there,

I'd like to suggest to add the functionality of fetching the time from an external NTP server and adjust the "system" (real system or container time) accordingly (taking delays into consideration). This seems to be useful when handling latency-sensitive use cases. Just found something similar here: https://gitlab.hopu.eu/software/FIWARE/FIWARESecurity/-/blob/master/iotAgents/iotagent/node_modules/sntp/README.md

So would it be possible to add this functionality and create env-variables like: NTP_Server -> Server IP / URL where to find the server NTP_Port -> Port of the NTP service NTP_Frequency -> how often the time should be synchronized

I also think this functionality could be useful to all FIWARE components. Looking forward to your response :)

[fgalan]

IOTAs take time from the operating system, so it's the operating system who has to keep sync using NTP.

From my point of view, this issue is out of the scope of IOTAs.

[SBlechmann]

If I'm not running the host system on my own, how do I know where the host system fetches its system time from? I mean... The only thing I'd like to do is so synchronize the iota (platform / system) time with my devices' time.