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 Rod,

You might not have taken traces correctly or somehow trace file got corrupted. Can you try to do it again? Please have a look at instructions on how to capture modem trace in our Cellular IoT Fundamentals course. It should be possible to upload file in mtrace format.

Best regards,
Dejan

[RodWatt]

Hi Dejan,

I started by trying this process using the nRF9169DK board

I produced this trace file

trace-2024-10-17T12-47-05.939Z.mtrace

which opened automatically in Waveshark.

I noticed that I was unable to subsequently open the same file in Waveshark but had to open the file that had been saved in Waveshark.

nrf9160_WS.pcapng

Anyway, this seems to work OK.

I then tried this on my own board using the same process and this is where i see problems.

Although I seem to be generating a .mtrace file, Waveshark reports no data.

Im guessing I have something wrong with my UART set up?

This is my overlay file 

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

&uart0 {
	status = "okay";
	current-speed = < 115200 >;
	pinctrl-0 = <&uart0_default>;
   	pinctrl-1 = <&uart0_sleep>;
   	pinctrl-names = "default", "sleep";
	/delete-property/ rts-pin;
	/delete-property/ cts-pin;
};

/* Enable uart1 for tracing. */


&uart1 {
   	status = "okay";
   	current-speed = <1000000>;
   	pinctrl-0 = <&uart1_default_alt>;
   	pinctrl-1 = <&uart1_sleep_alt>;
   	pinctrl-names = "default", "sleep";
	/delete-property/ rts-pin;
	/delete-property/ cts-pin;
};


&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;
		};
	};
};

&pinctrl {
	uart1_default_alt: uart1_default_alt {
		group1 {
			psels = <NRF_PSEL(UART_RX, 0, 14)>;
			bias-pull-up;
		};
		group2 {
			psels = <NRF_PSEL(UART_TX, 0, 13)>;
		};
	};

	uart1_sleep_alt: uart1_sleep_alt {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 14)>,
				<NRF_PSEL(UART_RX, 0, 13)>;
			low-power-enable;
		};
	};
};

Regards,

Rod

[dejans]

Hi Rod,

You could try to redirect your traces to UART0 and see if this has any effect. If you choose to do so, you need to replace instances of uart1 (as it is shown in the sending traces over UART section) with uart0. Then your terminal connection could go to uart1. If UART tracing is for some reason not possible or you have only one UART available on your custom board, you can try to do tracing with RTT. 

Best regards,
Dejan

[RodWatt]

Hi Dejan,

In the process of moving to UART0, I noticed an error in my overlay file which I have now corrected. (I labeled the pins a xx_default_alt and listed the names as xxx_default, without the _alt)

I am now able to generate a .mtrace file.

 However, it doesn't open in waveshark which reports no packets

my prj.conf file is as follows

# General
CONFIG_HW_ID_LIBRARY=y
CONFIG_ASSERT=y

# Logging
CONFIG_LOG=y
CONFIG_MQTT_HELPER_LOG_LEVEL_DBG=y

# Networking
CONFIG_NETWORKING=y
CONFIG_NET_SOCKETS_OFFLOAD=y
CONFIG_NET_SOCKETS=y
CONFIG_POSIX_API=y
CONFIG_NET_IPV4=y
CONFIG_NET_TCP=y
CONFIG_NET_NATIVE=y
CONFIG_NET_CONNECTION_MANAGER=y

# ZBus
CONFIG_ZBUS=y

# Zephyr state framework
CONFIG_SMF=y

# MQTT
CONFIG_MQTT_HELPER=y
CONFIG_MQTT_CLEAN_SESSION=y

CONFIG_MQTT_SAMPLE_TRANSPORT_BROKER_HOSTNAME="test.mosquitto.org"
#CONFIG_MQTT_SAMPLE_TRANSPORT_BROKER_HOSTNAME="192.168.1.124"

CONFIG_MQTT_SAMPLE_TRANSPORT_CLIENT_ID="SeaHorse_Test_Data"
CONFIG_MQTT_SAMPLE_TRANSPORT_PUBLISH_TOPIC="publish/topic"
CONFIG_MQTT_SAMPLE_TRANSPORT_SUBSCRIBE_TOPIC="subscribe/topic"

#Modem Trace
#CONFIG_NRF_MODEM_LIB_TRACE=y
#CONFIG_AT_HOST_LIBRARY=y

CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_UART_ZEPHYR=y

CONFIG_UART_ASYNC_API=y
CONFIG_SERIAL=y

#UART Trace
CONFIG_USE_SEGGER_RTT=n
CONFIG_RTT_CONSOLE=n
CONFIG_UART_CONSOLE=y
CONFIG_LOG_BACKEND_RTT=n
CONFIG_LOG_BACKEND_UART=y

# UART configuration
CONFIG_SERIAL=y
CONFIG_UART_ASYNC_API=y
CONFIG_UART_1_ASYNC=y
CONFIG_UART_1_INTERRUPT_DRIVEN=n

# Power management
CONFIG_PM_DEVICE=y

# TFM logging over uart1
CONFIG_TFM_LOG_LEVEL_SILENCE=n
CONFIG_TFM_SECURE_UART1=y
CONFIG_TFM_SECURE_UART_SHARE_INSTANCE=y
CONFIG_TFM_EXCEPTION_INFO_DUMP=y
CONFIG_TFM_SPM_LOG_LEVEL_DEBUG=y

# General
CONFIG_HW_STACK_PROTECTION=y
CONFIG_HW_ID_LIBRARY_SOURCE_IMEI=y
CONFIG_PICOLIBC=y
CONFIG_DK_LIBRARY=y
CONFIG_AT_HOST_LIBRARY=y

# Modem trace
CONFIG_NRF_MODEM_LIB_TRACE=y
CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_UART=y
CONFIG_SERIAL=y
CONFIG_UART_ASYNC_API=y

CONFIG_UART_0_ASYNC=y
CONFIG_UART_0_INTERRUPT_DRIVEN=n

# Disable Duplicate Address Detection (DAD)
# due to not being properly implemented for offloaded interfaces.
CONFIG_NET_IPV6_NBR_CACHE=n
CONFIG_NET_IPV6_MLD=n

# Zephyr NET Connection Manager and Connectivity layer.
CONFIG_NET_CONNECTION_MANAGER_MONITOR_STACK_SIZE=1024
CONFIG_NRF_MODEM_LIB_NET_IF=y

Regards,

Rod

[dejans]

Hi Rod,

Can you send your latest trace file so that I can also try to open it?

What happens when you switch to some older NCS version? Is tracing successful?

You could try choosing "Autoselect" for modem trace database.

Can you double check that you tried to open correct mtrace file?

Have you tried to use snippets to enable traces as it was suggested by Charlie previously?

Best regards,
Dejan