reading signal strength in firmware nrf91

RE: reading signal strength in firmware nrf91

Vojislav — Thu, 18 Jul 2019 13:32:21 GMT

Hi Hakan,

Thanks for the help, also one more thing needs to be changed. sizeof will return 0 because there is nothing in the buffer.

here is the function that worked for me:

void get_signal_strength(void){

        const char signal_strength_command[] = "AT+CESQ";
        char cmd_rcv_buf[50];
        enum at_cmd_state state;
        at_cmd_write(signal_strength_command, cmd_rcv_buf, 50, &state);
        if (state == AT_CMD_OK) {
            printk("answ: %s", cmd_rcv_buf);
	}	
        printk("state: %d, ret %d\n", state);
        
}

RE: reading signal strength in firmware nrf91

Håkon Alseth — Thu, 18 Jul 2019 12:25:00 GMT

Try something like this:

void get_signal_strength(void)
{
	const char signal_strength_command[] = "AT+CESQ";
	char cmd_rcv_buf[50];
	enum at_cmd_state state;
	int ret = at_cmd_write(signal_strength_command, cmd_rcv_buf, sizeof(cmd_rcv_buf), &state);
	if (state == AT_CMD_OK) {
		printk("answ: %s", cmd_rcv_buf);
	}	
	printk("state: %d, ret %d\n", state, ret);
}

RE: reading signal strength in firmware nrf91

Vojislav — Thu, 18 Jul 2019 10:54:22 GMT

Hi,

I am trying to do this, but there is no result:

void get_signal_strength(void){

        const char signal_strength_command[] = "AT+CESQ";
        char cmd_rcv_buf[50];
        enum at_cmd_state *err;
        at_cmd_write(signal_strength_command, cmd_rcv_buf, strlen(cmd_rcv_buf), err);
        printk("state: %d   ", err);
        printk("answ: %s \n", cmd_rcv_buf);
}

Of course, I am connected to the NB-IoT network before calling this function.
Serial output is:

state: 0   answ:

Do you know what might be the problem?

Best regards,
Voja

RE: reading signal strength in firmware nrf91

Håkon Alseth — Thu, 18 Jul 2019 08:46:51 GMT

If that is the only thing you're interested in, just send the at command and parse the response to filter out the RSRP.

If you need more parameters, have a look at this library: https://github.com/NordicPlayground/fw-nrfconnect-nrf/tree/master/lib/modem_info

Kind regards,

Håkon