I noticed that my sensors, running on an esp8266, has a lot of network calls to 1.pool.npt.org. This is a time server and I don’t know why so many calls are needed. I could block it (using pihole) but as this is a general time server that will probably lead to issues with other devices. Is there a reason for this many calls? And, if not, what could be done to solve this?
Number of calls in the last 24 hours:
Sensors: SDS011 and DHT22
Normally the sensor should call the ntp servers once per hour. This is needed to get a correct time for HTTPS certificate checks.
Could you please check the device internal status page that the sensor can connect to the ntp servers.
That sounds logical but is a bit more difficult than I thought. It is running on my guest network (not some kind of IoT network) but I cannot connect to it directly, also not when I log in onto the same guest network.
I’ll work on it and let you know later. Perhaps this is the time to setup an IoT network which I planned doing for some time now.
Yes, this is a feature for guest networks that the guests are separated against each other.
On some systems this can be deactivated (temporarily).
I know this for the AVM FritzBox that they had forbidden access to the NTP servers for the guest network. Only mail and http/https were possible…
