Hi Alex,

> I have been chasing this up with Quectel and they tell me this the correct 
> implementation.
> 
> "QCOPS and QENG command show the RSSI、RSRP and SINR value of the network, this 
> is in accordance with the 3GPP TS regulations, so it is normal for negative 
> numbers to be displayed.image"


So the image shows the value for <rsrp>

'0' if -140 dbm
...
'95' if dbm is -46 to -45
etc.

<rsrp> (what is actually sent over AT commands) is never negative. Isn't the 
image supporting my earlier assertion:  'AT commands do not have a concept of 
negative numbers'?

oFono exposes the <rsrp> value from 3GPP:

"byte ReferenceSignalReceivedPower [optional, lte]

         Contains the Reference Signal Received Power.  Valid range of values
         is 0-97. Refer to <rsrp> in 27.007, Section 8.69 for more details.
"

Regards,
-Denis