Hi Kostas,
It will depend on the values that you have previously set. Please look at the different scenarios, the Zigbee Cluster Libary Spec details.
If the Poll Control Server receives a Check-In Response from a client for which there is no binding (unbound),
it SHOULD respond with a Default Response with a status value indicating ACTION_DENIED.
If the Poll Control Server receives a Check-In Response from a client for which there is a binding (bound)
with an invalid fast poll interval, it SHOULD respond with a Default Response with status INVALID_
VALUE.
If the Poll Control Server receives a Check-In Response from a bound client after temporary fast poll mode is
completed it SHOULD respond with a Default Response with a status value indicating TIMEOUT.
In all of the above cases, the Server SHALL respond with a Default Response not equal to ZCL_SUCCESS
Please look at the 3.16.5.3.1.2 Fast Poll Timeout
Regards,
Mario