Could not init AT param list, error: -12 nrf9160

[Lemmiwink]

Hello,

I have changed the provided UDP sample to send some cellular data (RSRP, RSRQ) to our server within an fixed intervall. So I am using a few AT commands (at_cmd_write(...)) within the program. After sending the sixth data package, I get the following error message by trying to send AT commands: 

E: Could not init AT params list, error: -12
E: Failed to parse notification (error -12): +CEREG: 0

E: Could not init AT params list, error: -12
E: Can't parse signalling mode, error: -12
E: Could not init AT params list, error: -12
E: Failed to parse notification (error -12): +CEREG: 0

After rebooting the Board, everything works fine again until the sixth package. 

Best regards,

Tim 

[Albrecht Markus Schellenberger]

Hello Tim,

that is a little bit hard to say without a detailed application log, but my best guess would be the following:

The UDP application uses the LTE link controller library. It has an at_handler() function to process AT command notifications.

In the handler, the parse_cereg() function is called. In this function, the call of at_params_list_init() probably fails.

The API description of this function states that:

"An array of max_params_count is allocated. Each parameter is initialized to its default value. This function should not be called again before freeing the list."

max_params_count is defined with value 11 in the LTE link controller library.

So I assume that the application is not able to clear the list fast enough. Maybe the fixed interval you are sending the cellular data with is too short?

Regards,

Markus

[Lemmiwink]

Hello Markus,

I am using the at_cmd_write function and char buffers to save the result. Is that a problem?  

[Albrecht Markus Schellenberger]

Hello Tim,

not, that should not be a problem. What is the interval between the data transmissions?

Regards,

Markus