nrf9160dk How to add custom at command

RE: nrf9160dk How to add custom at command

llly — Tue, 28 May 2024 02:13:51 GMT

ok, thank you for your patient answer

RE: nrf9160dk How to add custom at command

Charlie — Mon, 27 May 2024 13:57:06 GMT

Hi Illy,

[quote user="llly"]One is that in the at client, the end needs to be set to CR and LF to recognize commands properly, but in SLM, keeping the default CR end can recognize commands properly.[/quote]

I think this is not an issue. SLM and AT Client use CONFIG_CR_LF_TERMINATION=y and CONFIG_CR_TERMINATION=y by default respectively, you can just change to what you want at building time. The Serial Terminal also has Line Ending option allows you to set up the termination method.

[quote user="llly"]Another issue is that custom commands in SLM can be case insensitive, and even mixed case is fine. However, in at client, commands can only be executed in all uppercase, otherwise an error will be returned (custom commands in both projects are all uppercase).[/quote]

It seems AT Client support case-insensitive for modem AT commands but not custom commands. I think this depends on the at commands processing in MFW. For a custom AT command, it will match exactly what you provide.

*** Booting nRF Connect SDK v3.5.99-ncs1-1-4-ga681edb8d456 ***
The AT host sample started
Ready
> at+CFUN?
+CFUN: 0
OK
> at+cfun?
+CFUN: 0
OK
> at+mycommand=?
at+mycommand=?
> AT+MYCOMMAND=?
+MYCOMMAND: (0, 1)
OK

Best regards,

Charlie

RE: nrf9160dk How to add custom at command

Charlie — Mon, 27 May 2024 13:57:04 GMT

Hi Illy,

[quote user="llly"]One is that in the at client, the end needs to be set to CR and LF to recognize commands properly, but in SLM, keeping the default CR end can recognize commands properly.[/quote]

*** Booting nRF Connect SDK v3.5.99-ncs1-1-4-ga681edb8d456 ***
The AT host sample started
Ready
> at+CFUN?
+CFUN: 0
OK
> at+cfun?
+CFUN: 0
OK
> at+mycommand=?
at+mycommand=?
> AT+MYCOMMAND=?
+MYCOMMAND: (0, 1)
OK

Best regards,

Charlie

RE: nrf9160dk How to add custom at command

llly — Sat, 25 May 2024 01:37:46 GMT

Thank you so much，It is indeed a problem with CR and LF at the end of commands. The default setting is to end with a CR. But now there are two other small issues.

One is that in the at client, the end needs to be set to CR and LF to recognize commands properly, but in SLM, keeping the default CR end can recognize commands properly.

Another issue is that custom commands in SLM can be case insensitive, and even mixed case is fine. However, in at client, commands can only be executed in all uppercase, otherwise an error will be returned (custom commands in both projects are all uppercase).

Can you help me check again what caused these two problems? Thank you again

RE: nrf9160dk How to add custom at command

Charlie — Fri, 24 May 2024 14:10:07 GMT

Hi Illy,

Try to set CONFIG_CR_LF_TERMINATION=y.

Best regards,

Charlie

RE: nrf9160dk How to add custom at command

llly — Fri, 24 May 2024 07:31:33 GMT

nrf\samples\cellular\at_client

Thank you.

RE: nrf9160dk How to add custom at command

Charlie — Fri, 24 May 2024 07:08:46 GMT

[quote user="llly"]The current issue is that custom commands added using the same method in other sample level projects[/quote]

"other sample level projects" Which sample have you tested with? I can have a try.

RE: nrf9160dk How to add custom at command

llly — Fri, 24 May 2024 02:16:34 GMT

hi Charlie,

thank you for your help. I have successfully added custom commands to SLM and they are working properly. I compared my SLM with the SLM you sent me, and the custom command section is consistent. The current issue is that custom commands added using the same method in other sample level projects will only return normally when the first command is entered, and will return an error when entered again later, as shown in the above figure

RE: nrf9160dk How to add custom at command

Charlie — Thu, 23 May 2024 12:28:34 GMT

Hi Illy,

I did a quick check by modifying SLM application in NCS v2.6.1. It works as expected.

Here are the project and hex file. You can check the difference compared with your modification.

devzone.nordicsemi.com/.../ncs261_5F00_slm_5F00_customATcommands.zip

devzone.nordicsemi.com/.../ncs261_5F00_slm_5F00_customATcommands.hex

I suggest you refer to this page if you want Extending the application — nRF Connect SDK 2.6.99 documentation (nordicsemi.com) in SLM application.

Best regards,

Charlie

RE: nrf9160dk How to add custom at command

llly — Thu, 23 May 2024 07:57:47 GMT

Now it has been implemented to add custom commands in the SLM example, but I used the same method to add custom commands to a hello world project. Custom commands only return OK when sent the first time, and error when sent the second time or after, The built-in commands in the modem, such as+cfun or+cereg, do not have this issue