Hi,
currently i'm dealing with problems with this https://github.com/NordicPlayground/fw-nrfconnect-nrf/pull/1300 pull request which have wrong title and wrong changes (Master branch).
The newest firmware did change the number of parameters of command however that command is +CESQ not %CESQ. The code tries to fix this problem how ever it does not change the index to rsrp value from the reference.
I belave the correct change should be:
#define RSRP_PARAM_INDEX 6
#define RSRP_PARAM_COUNT 7