modem_info_string_get block the program and didn't return value

[thomas oggier]

Hello all,

I m working on nrf9160dk and zephyr and I would like to get modem's informations.

To do that, I've used the modem_info_init and modem_info_string_get function. It works fine on the main (get all values), but when I try to get this informations  with a Zephyr event, the program didn't get values and wait a response which never come.

I've also add the #include <modem/modem_info.h> and  CONFIG_MODEM_INFO=y

The following function is called once from the main and once from the event and didn't get the same result.

Function:

void refreshAllValues()
{
	int res;
	res = modem_info_init();
	if (res != 0)
	{
		printk("modem info, err = %d\n", res);
	}

	printk("Modem_info_manager refreshAllValues\n");

	char buf[50];
	res = modem_info_string_get(MODEM_INFO_CELLID, buf, sizeof(buf));
	if (res > 0)
	{
		printk("Modem INFO cellID: %s size %i\n", buf, res);
	}
	else
	{
		printk("Could not have modem info cellID\n");
	}
}

Result

// Called from Main
=====================================================================
Modem_info_manager refreshAllValues
[00:00:04.967,956] <dbg> at_cmd.at_write: Sending command AT+CEREG?
[00:00:04.974,060] <dbg> at_cmd.socket_thread_fn: Allocating memory slab for AT socket
[00:00:[00:00:04.980,407] <dbg> at_cmd.at_write: Awaiting response for AT+CEREG?
04.981,872] <dbg> at_cmd.socket_thread_fn: Allocation done
[00:00:04.994,445] <dbg> at_cmd.socket_thread_fn: at_cmd_rx 38 bytes, +CEREG: 3,1,"0521","01152C03",7
OK
[00:00:05.004,028] <dbg> at_cmd.at_write: Bytes sent: 9
Modem INFO cellID: 01152C03 size 8
[00:00:05.012,908] <dbg> at_cmd.socket_thread_fn: Allocating memory slab for AT socket
[00:00:05.020,660] <dbg> at_cmd.socket_thread_fn: Allocation done


// Called from processEvent
=====================================================================
Modem_info_manager refreshAllValues
[00:00:10.025,146] <dbg> at_cmd.at_write: Sending command AT+CEREG?
[00:00:10.031,372] <dbg> at_cmd.at_write: Awaiting response for AT+CEREG?

// Wait here until we restart the program

Does anyone have a way to fix this?

[Didrik Rokhaug]

Hi,

What do you refer to with "a Zephyr event"?

In what context does refreshAllValues() run the second time?

In earlier versions of NCS, the at_cmd library could not be used from the system workqueue (or it would cause a deadlock), though that should now be possible in at least NCS v1.4.0 and newer.

With the current version, you can not write new AT commands from an at_cmd callback.

Also, while this is probably not the cause of your error, you should not call modem_info_init twice.

Finally, be aware that due to Christmas vacations, response times might be slower than normal.

Best regards,

Didrik