Migrating MQTT Sample to a Custom Board

[RodWatt]

Hi,

I have successfully built and ran the MQTT sample (/opt/nordic/ncs/v2.7.0/nrf/samples/net/mqtt) on the nRF9160-DK. I did have a few problems with SIM coverage and firmware versions which was sorted in this ticket.

 MQTT Sample Not Connecting on nRF9160 Board 

I would now like to move this code onto my own board.

When I run this code on my own board, I see this error.

*** Booting nRF Connect SDK v2.7.0-5cb85570ca43 ***
*** Using Zephyr OS v3.6.99-100befc70c74 ***
[00:00:00.431,610] <inf> network: Bringing network interface up and connecting to the network
[00:00:00.658,813] <inf> nrf_modem_lib_trace: Trace thread ready
[00:00:00.666,107] <inf> nrf_modem_lib_trace: Trace level override: 2
[00:00:00.667,724] <err> lte_lc: Could not send AT command, error: 65536
[00:00:00.667,755] <err> lte_lc: Failed to set system mode and mode preference, err -14
+CEREG: 2
+CEREG: 4
+CEREG: 2,"B984","00542616",9
+CSCON: 1
+CEREG: 2,"B984","00542616",9,0,11
+CSCON: 0

 

My overlay file is shown below.

&pinctrl {
        uart0_default: uart0_default {
                group1 {
                        psels = <NRF_PSEL(UART_TX, 0, 6)>, <NRF_PSEL(UART_RX, 0, 7)>;
                };
        };

        uart0_sleep: uart0_sleep {
                group1 {
                        psels = <NRF_PSEL(UART_TX, 0, 6)>, <NRF_PSEL(UART_RX, 0, 7)>;
                        low-power-enable;
                };
        };
};

&uart0 {
        status = "okay";
        current-speed = < 115200 >;
        /delete-property/ rts-pin;
        /delete-property/ cts-pin;
};

/* Enable uart1 for tracing. */

&uart1 {
   status = "okay";
   current-speed = <1000000>;
   pinctrl-0 = <&uart1_default>;
   pinctrl-1 = <&uart1_sleep>;
   pinctrl-names = "default", "sleep";
};

/ {
   chosen {
      nordic,modem-trace-uart = &uart1;
   };
};

I use UART0 for my serial terminal.

Would appreciate your pointers on this,

Thanks,

Rod 

[dejans]

Hi,

Which LTE network mode do you use?

Which SIM card do you use?

Which operator do you connect to?

Which modem firmware version do you use?

Best regards,
Dejan

[RodWatt]

Hi Dejan,

I am using the same SIM that works on the nRF9160DK board, its a Tesco SIM which I believe uses the O2 network. 

Im using Firmware ver 1.3.6. 

Rod

[dejans]

Hi Rod,

I have read your previous case MQTT Sample Not Connecting on nRF9160 Board
I can see that you had the same issue there

[00:00:00.667,724] <err> lte_lc: Could not send AT command, error: 65536
[00:00:00.667,755] <err> lte_lc: Failed to set system mode and mode preference, err -14

What has been changed now compared to your previous above-mentioned ticket? Can you elaborate?

Best regards,
Dejan

[RodWatt]

Hi Dejan,

Yes, I was having connectively problems but i changed to a new SIM/network provider and updated the firmware and was able to successfully connect to the network. I detail this at the end of the ticket. This was using the nrf9160DK board. 

I then move the SIM to my own board and am seeing the errors above. Apart from my overlay file changes detailed above, do i need to make any other changes to migrate the code to my own board?

Regards,

Rod

[dejans]

Hi Rod,

Did you provide full application log in your initial post?

Could you provide your modem trace?
We will then look into it during next week.

Best regards,
Dejan