Why Serial LTE modem（SLM）doesn't work on SIAA.

[shibuta]

Hi.
I wrote a firmware on nrf9160(SIAA chip), but it doesn't work.
On the hardware side, the circuit is same as that of nrf9160-DK, CTS and RTS is short respectively.

If the firmware is normal, I'll expect the firmware transmits "Ready".
But, I activate the circuit, when the firmware doesn't transmit "Ready" from TX.

I explain how to make firmware as below.
The firmware consists of two type firmware , a modem firmware and an application one.

The modem firmware version is 'mfw_nrf9160_1.3.6.zip' , written with Programmer (v4.3.0) from nrfConnect Desktop.

While, I built an application firmware of Serial LTE Modem with nRF Connect SDK (v2.7.9-rc2) .
I added "CONFIG_SLM_GNSS=n" in prj.conf file because it doesn't use GNSS.

Does the firmware requires anything else for normally working on SIAA ?

Best regards.

[Hakon]

Hello,

I wrote a firmware on nrf9160(SIAA chip), but it doesn't work.

does this work with other hardware versions? Can you show the log?

[shibuta]

Hello,

I confirmed SICA chip works normally, but it won't long an hour.

SIAA chip has no response.

On the other side, SICA, I can show the log below, I omitted the personal information as "..." .

Should I add any other option in prj.conf ?

I use TLS session. When I use modem side TLS, I failed to upload on SIAA (SICA is successful).

Best regards.

AT%CMNG=0,222,0,"
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----"

 <-LTE(236 - 167) : Ready[OK]
 
 AT%XSYSTEMMODE=1,0,0,0

OK
AT+CGDCONT=0,"IP","..."

OK
AT+CFUN=1

OK
AT+CGDCONT?

+CGDCONT: 0,"IP","...","",0,0

OK

:
:

AT+CGDCONT?

+CGDCONT: 0,"IP","...","MMM.NNN.OOO.PPP",0,0

OK


AT#XHTTPCCON=1,"....amazonaws.com",443,222

#XHTTPCCON: 1

OK
AT#XHTTPCREQ="POST","...","User-Agent: slm\r\naccept: */*\r\n","2024/08/01 10:00:39,...,...",32

OK

#XHTTPCREQ: 1
2024/08/24 16:54:39,WLA-051,28.6
+++
#XDATAMODE: 0

#XHTTPCREQ: 0
HTTP/1.1 200 OK
Date: Thu, 01 Aug 2024 01:35:43 GMT
Content-Type: application/json
Content-Length: 26
Connection: keep-alive
x-amzn-RequestId: d9caa529-f671-43f6-b204-0adff4aca122
x-amz-apigw-id: bzjxVHqnNjMEDCA=
X-Amzn-Trace-Id: Root=1-66aae5f1-4c2814ed165b9d8b153655d0;Parent=1dcfaf7248eacb1d;Sampled=0;lineage=7656a112:0


#XHTTPCRSP:334,1
CSV Processed Successfully
#XHTTPCRSP:26,1

[Hakon]

I would advice you to capture a modem trace then.