I'm playing with The low power door/window sensor and noticed that from time to time the server is not responding when I switch a button to simulate the opening/closing of a door. I'm not sure if the server is really freezing. It's also possibel that there is no communication between the 2 radio's. Is there a way to check the communication by using leds for example to see if both modules are really sending/receiving?
You can also check debug files in EasyIoT server side and Arduino side to see communication messages. Do you use capacitors on NRF24L01 power lines? Usually it helps.
I'm using EasyIoT server and MySensors protocol more than half a year and I didn't notice anything unusual. Sometimes I lost communication with my sensor on balcony - but reason are metal blinds on door. All other sensors works without problems.