Hello,
We struggle to keep LTE-M attached with nRF91 (Modem) and CMW500 (EPS) to test regular IP communication (so those are not Radio Access Network tests) during product certification.
During the LTE session attach, EPS Core (CMW500) MME asks Modem on NAS protocol to activate DTAP Test Mode.
Modem then just after attach is complete sends detach request.
Is there any Modem or R&S CMW500 setting to keep session active with PDN service please?
LTE modem trace is attached.
AT command flow:
%HWVERSION: nRF9151 LACA A0A
%SHORTSWVER: nrf91x1_2.0.2
AT+CFUN=0
AT%XPOFWARN=1,30
AT%XTEMPHIGHLVL=70
AT%XTEMP=1
AT%XSYSTEMMODE=1,0,0,0
AT%XDATAPRFL=0
AT%XBANDLOCK=1,"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000001"
AT%XSIM=1
AT%XNETTIME=1
AT%MDMEV=1
AT%RAI=2
AT+CPSMS=1,"","","00111000","00000000"
AT+CEPPI=1
AT+CEREG=5
AT+CGEREP=1
AT+CMEE=1
AT+CNEC=24
AT+CSCON=1
AT+COPS=1,2,"00101"
AT+CGDCONT=0,"IP","cmw500.rohde-schwarz.com"
AT+CGAUTH=0,0
AT%XMODEMSLEEP=1,500,10240
URC: %XMODEMSLEEP: 4
AT+CFUN=1
URC: +CGEV: EXCE STATUS 0
URC: %XSIM: 1
AT+CIMI
001010123456063
AT%XICCID
%XICCID: 8952530316680026187
URC: +CEREG: 2,"0001","00000100",7
URC: %RAI: "00000100","00101",0,0
URC: +CSCON: 1
URC: +CEREG: 1,"0001","00000100",7,,,"11100000","11100000"
AT+COPS?
+COPS: 1,2,"00101",7"
AT%XCBAND
%XCBAND: 1"
AT+CEINFO?
+CEINFO: 0,1,C,1,1,-83,21
AT+CGDCONT?
+CGDCONT: 0,"IP","cmw500.rohde-schwarz.com","192.168.48.129",0,0
Then open socket fails due to detached LTE session.
Thank you,
Michal