Problem with simultaneous transmission and reception

[Revo]

Hi all again guys! I am experiencing a problem with my application: i have a beacon that is sending ADC converted values to a nrf51 DK (via notification), which is connected to the pc to receive these values via USB and visualize them; from the pc, i also send back some values at precise moments to the beacon, via write without response, so that the transmission is bi-directional. What happens is that sometimes (it seems pretty much random, other times it all goes good with no problems), when i decide to send some numbers from the PC using the write operation (while of course i am still receiving notifications simultaneously), this causes a disconnection between the two devices (i think probably because of an error occurring in these operations), with consequent loss of data sent by notification, that should be continuous and real-time. What could be the problem? Isn't the nrf51 capable of handling both transmission and reception simultaneously? Please note that my connection parameters between the two devices are 10 ms of connection interval, and 0 slave latency.

Thanks in advance and tell me if any other information are needed!

projects.rar

[Revo]

Ok sorry, my first goal was to understand if it was capable or not, now i know that there should be a problem in the code. Yes, when i DON'T send numbers, the transmission from the beacon (peripheral) to the DK (central) works perfectly, the problem arises randomly (though pretty often) with the opposite way. I uploaded the zip (you probably already saw it because you helped me with older problems about it) with both the files loaded on the beacon and the ones for the DK, i put both of them because i don't know which of the two devices makes this disconnection problem, even though of course is the DK that makes the write operation while receiving notifications by the beacon. Always really thanks for your help.

I resume briefly the two codes:

BEACON SIDE: converts with the ADC every 2 ms, then save the result filling five packet of 20 bytes, then sends them via notification to the DK

DK SIDE: receives the notification after doing db discovery of the service of the beacon, then sends them via uart to the pc; when from the pc i write an array of 13 integer and send them via UART to the DK, it gets an event and writes these values on the beacon, on a appropriate characteristic (for doing this, there is a control of the 10th value of the array that must be nonzero).