Error when calling AT+QCFG with "band" parameter

[mallenbach]

The call done below returns an error

FreeRTOS-Cellular-Interface-Reference-Quectel-BG96/source/cellular_bg96.c

Line 285 in f61fc4c

atReqGetNoResult.pAtCmd = "AT+QCFG=\"band\",f,400a0e189f,a0e189f";

The error is CELLULAR_INTERNAL_FAILURE.

I am using a BG96 module running firmware BG96MAR02A07M1G_01.202.01.202

[chinglee-iot]

Hi mallenbach,
The band configuration is set to any frequency band in the implementation.
It looks like catnb1bandval is not supported in your modem.
Can you share your setting here?

[mallenbach]

Hi @chinglee-iot - thanks for your answer.

Can you share your setting here?

Sure - what kind of setting are you expecting?

[chinglee-iot]

@mallenbach
Since cellular band requirements vary by region and hardware variant, these BG96 configuration macros (CELLULAR_BG96_ENABLE_BAND_CONFIGURATION and CELLULAR_BG96_BAND_CONFIGURATION) allow flexible support for different BG96 module deployments.

in cellular_bg96.h

/* Enable/disable band configuration for BG96 modules */
#ifndef CELLULAR_BG96_ENABLE_BAND_CONFIGURATION
    #define CELLULAR_BG96_ENABLE_BAND_CONFIGURATION    ( 1 )
#endif

/* Default band configuration if enabled */
#ifndef CELLULAR_BG96_BAND_CONFIGURATION
    #define CELLULAR_BG96_BAND_CONFIGURATION "f,400a0e189f,a0e189f"
#endif

in cellular_config.h

#define CELLULAR_BG96_ENABLE_BAND_CONFIGURATION    ...
#define CELLULAR_BG96_BAND_CONFIGURATION  ...

These configuration options enable you to either use the module's default band settings by disabling band configuration, or specify custom band settings that match your board's regional and hardware requirements.

Could you help to take a look to see if these configurations can support your bg96 module?

[ANauzet]

Hi @chinglee-iot
I'm working with @mallenbach

Could you help to take a look to see if these configurations can support your bg96 module?

I have checked in both cellular_bg96.h and cellular_config.h, I could not found those defines.

In FreeRTOS-Cellular-Interface-Reference-Quectel-BG96/source/cellular_bg96.c

Line 285 in f61fc4c
atReqGetNoResult.pAtCmd = "AT+QCFG="band",f,400a0e189f,a0e189f";
There is no use of #define

Also, I have checked the AT+QCFG for BG96 documentation:
https://www.quectel.com/content/uploads/2025/03/Quectel_BG96_QCFG_AT_Commands_Manual_V1.1.pdf

Page 16, there is no possibility to put 400a0e189f for the <eMTC_bandval> parameter.

• a0e189f is the default value
• 0x40000000 is the "no change value"

In our code, when using:
atReqGetNoResult.pAtCmd = "AT+QCFG=\"band\",f,a0e189f,a0e189f";
There is no error returned

[chinglee-iot]

@ANauzet

I created a PR for this change. #18
Can you help to take a look to see if the change can adapt to your BG96 modem.