Hello, i currently evalutate LTE-M for my company and i run into a lot of trouble for starting the test. But at least i have able to do the test
I have cut a lot of code from the AssetTracker example, mainly the software connect modem to the network ( using lte_lc_init_and_connect ) and go to sleep for 10 sec (and blink some led)
After successful connexion , i call lte_lc_psm_req(true) and then use the command AT+CPSMS? to read back that the PTAU and active time is set correctly (and it is the case). My software never send something it only go to sleep.
Application started
LTE LC config ...
recv: +CEREG: 2,"01C3","00A8FE04",7,0,0,"11100000","11100000"
recv: +CEREG: 1,"01C3","00A8FE04",7,,,"00001000","11100000"
PSM set to true
+CPSMS: 1,,,"10100010","00000110"
With such value i expect to have a TAU every 2 minutes with an active time of 12 secondes.
BUT current measurement doesn't show this, i have run my software recording current consomption for one hour and i have the following results:
Details , board start, connect to network, set PSM and go to sleep:
Details 2 : After sleeping 53m44s a supposed TAU is done (and active time is around 14 sec)
<Test Setup>
- DK v0.8.5 (SB43 cut) ,power supply is a 3.6V source connected on P28
- modem firmware v1.0.1
- ncs tag; v1.0.0
- current measurement tool: multimeter Agilent 34465A connected on P24 (pin 1 and 2), calibre 1A
- Sim cards tested : iBasis and Orange
-Country : France (so i suppose iBasis is roamed on Orange network)
-LTE_PCO_LEGACY = n
My questions is :
Does the details 2 screenshot show current involved in PTAU as supposed ?
If yes, why the PTAU is effectued around 54 minutes after i put the board in sleep and not every 2 minutes as requested (and agreed with network i do the read 10 secondes after connexion) ?
Any idea that can help me to understood is welcome
