RF: Device connecting to Wifi every 2 minutes

[vbs]

I am exclusively using RF to transmit sensor data and AFAIK I did not configure any services to transmit sensor data via Wifi. Still, I my router log I can see that the device connects to Wifi every 2 minutes and disconnects instantly again. Usually the device should boot, keep Wifi activated for 5 minutes and then deactivate, right? This is happening ok but can this 2 minute wakeup be deactivated somehow?

Code:

[info

vESPrino v1.16 build20170618
IP address: 192.168.2.21
Chip ID: D54288
ready >]