Cellular.command() AT commands with Quotation marks how to

Firmware
1

For testing I need to make a B523/B524 run a specific network technology, in this case 2G with the Quectel specific command AT+QCFG=“nwscanmode”,1,1

I tried the doc example here: Device OS API | Reference Documentation | Particle but in setup instead of loop.

SerialLogHandler logHandler(LOG_LEVEL_TRACE);

void setup()
{
    WITH_LOCK(Cellular) {
        Cellular.command("AT+QCFG=“nwscanmode”,1,1\r\n");
    }
}
 
void loop(){
}

But it does not have any effect, and a trace show an “ERROR” response.

[connected ...]
0000041549 [system] INFO: Cloud connected
0000041550 [ncp.at] TRACE: > AT+QCFG=“nwscanmode”,1,1
0000041553 [ncp.at] TRACE: < ERROR
[... etc.]

I later tried this logging the cellular.command response, and that is = -3 meaning RESP_ERROR.

With “AT” (or AT+CPAS) it works fine:

0000004721 [system] INFO: Cloud connected
0000004722 [ncp.at] TRACE: > AT
0000004723 [ncp.at] TRACE: < OK
[... etc.]

Also tried AT commands including quotes just requesting status info such as AT+QCFG=“nwscanmode” and AT+QCFG=“nwscanseq”, that I believe should get an OK, but it is still an error response.

So I am wondering if quotation marks in AT commands are making trouble, and how to handle that in cellular.command()?

2

Have you tried using escaped quotes (\") in your string? I’m not familiar with AT commands but I doubt it works with “smart-quotes”.

Cellular.command("AT+QCFG=\"nwscanmode\",1,1\r\n");
3

Yes I tried it without success, but copying you example worked just now, in the sense that I got an OK response :+1:

I did not get the intended result out of the AT command, but that is another topic.

4

Ah, the reason it did not work for me at first was a classic - copying the AT command code from doc, it contained the wrong type of quotes “ instead of ".

1 Like
5

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