So your post has caused a bit of discussion and we are looking around to actually see what that command does as for these sorts of things the unit can typically request a value but the network always has the final say so the statement in the manual where it says ‘it is mandatory for the network to accept the value’ may well be incorrect which we are looking at right now. Its certainly not an option on any of our other LTE units that we have ever produced.
So we have confirmed that yes you can set the DRX from the LTE side on the HL78, you cannot on 2G, the network sets what it wants you to do and that’s that. So that’s a generic answer for the HL78 and the HL7692 (I originally answered the question from a HL7692 2G perspective).
HL7692 is very old now and is long since past having new features implemented in it. We might implement it in newer modules like the WP or the RC series but it is dependent on the chipset provider giving an API access to allow us to do it in the first place.
I have another question about these two modules (HL7692 and HL 7802)
I made some power consumption measurements and I noticed something strange about 2G technology usage in these modules.
In HL7692 average current is about 13.5 mA during IDLE/RUN state.
And in HL7802 average current is about 67 mA during the same state!
Why there so much difference in power consumption between these two?
Different chipsets, different behaviour although the specification states 35-38mA for the HL780x in this mode. The unit has not been optimised for idle mode, you are far better off pulling the unit in and out of sleep using DTR, you will start getting an average current down in the low single digit mA region with a small effort on the application side given it does not take long to come out of sleep.
Product Technical Specification (August 2020) states there is 35 mA in running mode for LTE-M, but there is no information about 2G. That’s why I made some measurements.
And that’s true that coming out of sleep is quite fast, but going to sleep is long in HL7692 (even 7 seconds!!). So in some cases sleep it’s not useful at all.
I don’t understand why 2G wasn’t optimized in HL7802 when in HL7692 it had very good current consumption parameters.
Is there any chance that 2G will be optimized in HL7802 in future fw release?