Exercise 4 – FOTA over LTE-M/NB-IoT

[irsad_kures]

Hi, I try to update firmware with nbiot. I flush 

Exercise 4 – FOTA over LTE-M/NB-IoT  sample in devacademy

�*** Booting nRF Connect SDK 3758bcbfa5cd ***
[00:00:00.251,678] <inf> cloud_connection: Enabling connectivity...
[00:00:00.527,587] <inf> cloud_connection: Setting up nRF Cloud library...
[00:00:00.529,479] <inf> nrf_cloud_fota_common: Saved job: , type: 6, validate: 0, bl: 0x0
[00:00:00.530,303] <inf> cloud_connection: Waiting for network ready...
Hello World! nrf9160dk_nrf9160
+CEREG: 2,"1600","00096967",9
+CSCON: 1
+CGEV: ME PDN ACT 0,0
+CNEC_ESM: 50,0
+CEREG: 1,"1600","00096967",9,,,"00010000","11100000"
[00:01:32.102,722] <inf> cloud_connection: Network connectivity gained!
%XTIME: "21","42501241520121","00"
[00:01:33.102,844] <inf> cloud_connection: Network is ready
[00:01:33.102,874] <inf> cloud_connection: Connecting to nRF Cloud
[00:01:33.102,935] <inf> cloud_connection: Device ID: nrf-351358811477337
[00:01:33.102,996] <dbg> cloud_connection: cloud_event_handler: NRF_CLOUD_EVT_TRANSPORT_CONNECTING
[00:01:33.103,302] <dbg> cloud_connection: cloud_event_handler: NRF_CLOUD_EVT_TRANSPORT_CONNECT_ERROR: -3
[00:01:33.103,332] <dbg> cloud_connection: clear_readiness_timeout: Stopping cloud connection readiness timeout
[00:01:33.103,332] <inf> cloud_connection: Disconnecting from nRF Cloud
[00:01:33.103,363] <dbg> cloud_connection: disconnect_cloud: Already disconnected from nRF Cloud
[00:01:33.103,393] <err> cloud_connection: Could not connect to nRF Cloud
[00:01:33.103,424] <inf> cloud_connection: Retrying in 60 seconds...

this is my output. actually when I flush asset trcker v2 , it does not matter. it is normal. I can connect to nrf cloud.

but in this example I can not connect to nrf cloud. what must I do? thank you.

[Didrik Rokhaug]

Hi,

What SIM card are you using?

Could it be that it is out of data?

From the log, it looks like the DNS lookup fails. Can you take a modem trace, so that we can see the communication between the modem and the network?

Best regards,

Didrik

[irsad_kures]

trace-2024-05-28T06-59-30.130Z.mtrace

Trace is here , I wait for your response.

[irsad_kures]

we tried like this after flushing, is it correct? 

[Muhammed]

Mr. Irşad and I are together now. He flashed the FOTA code in Exercise 4. Then we took the trace from the Cellular Monitor screen. But when we take it, we see that it takes a low byte. Is there something we did wrong?

[Didrik Rokhaug]

Did you edit the application to enable modem traces?

https://docs.nordicsemi.com/bundle/nrf-connect-cellularmonitor/page/requirements.html#software-requirements

I also recommend that you reset the device after starting the trace, so that you are sure the trace captures everything from the start.

[irsad_kures]

trace-2024-05-29T07-13-45.407Z.mtrace

I tried again as you said. can you help again?

[Didrik Rokhaug]

Can you try to set CONFIG_NET_IPV6=n?

[Muhammed]

...

[Muhammed]

I triyed but not working.

[Didrik Rokhaug]

I had another look at the modem trace, and while it originally looked similar to another recent ticket where the problem was that the application tried to use IPv6 while the network only supported IPv4, I saw now that the network doesn't provide you with a DNS server address.

You can provide a fallback DNS server to the modem with nrf_setdnsaddr().

Can you add a call to that function where you provide the IPv4 address of a DNS server?

[Muhammed]

/*

 * Copyright (c) 2012-2014 Wind River Systems, Inc.

 *

 * SPDX-License-Identifier: Apache-2.0

 */

#include <stdio.h>

#include "cloud_connection.h"

#include "nrf_socket.h"

#define CONNECTION_THREAD_STACK_SIZE 2048

/* Define, and automatically start the cloud connection thread. See cloud_connection.c */

K_THREAD_DEFINE(con_thread, CONNECTION_THREAD_STACK_SIZE, cloud_connection_thread_fn,

        NULL, NULL, NULL, 0, 0, 0);

int main(void)

{

    struct nrf_in_addr dns;

    dns.s_addr = 134744072; // Google DNS, 8.8.8.8

    const int err = nrf_setdnsaddr(2, &dns,8);

    printk("DNS set result %d\n", err);

  k_sleep(K_SECONDS(10));

    printf("Hello World! %s\n", CONFIG_BOARD);

    return 0;

}

I added but not working

[Didrik Rokhaug]

Did you get any errors from nrf_setdnsaddr?

nrf_setdnsaddr must be called after the modem library has been initilized (otherwise the modem isn't powered to receive the DNS server address), so it might be better to place it between the calls to conn_mgr_all_if_connect and setup_cloud in cloud_connection_thread_fn.