The +CESQ command returns received signal quality parameters. This
command issues a valid response only when the modem is activated.
v2.0.x
For reference, see 3GPP 27.007 Ch. 8.69.
Note: When
Narrowband Internet of Things (NB-IoT) system mode is used and the device is in RRC
CONNECTED state, old signal quality parameter values are reported. The values are recorded and
reported from the previous RRC IDLE state.