nrf9160 MQTT Mqtt.c Last will and testamenet

[David]

Hello,

Im currently Implementing Last will and Testament message on my device, Im not using the AWS Libraries here.

Any suggestions on how to Implement this feature? (See prj.conf below)

#
# Copyright (c) 2020 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# Date/time library // #include <date_time.h>
#CONFIG_DATE_TIME=y
#CONFIG_DATE_TIME_UPDATE_INTERVAL_SECONDS=60

# Networking
CONFIG_NETWORKING=y
CONFIG_NET_NATIVE=n
CONFIG_NET_SOCKETS_OFFLOAD=y
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_POSIX_NAMES=y

# LTE link control
CONFIG_LTE_LINK_CONTROL=y
CONFIG_LTE_AUTO_INIT_AND_CONNECT=n

# Modem library
CONFIG_NRF_MODEM_LIB=y

# AT Host
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_AT_HOST_LIBRARY=y

# Modem library
CONFIG_NRF_MODEM_LIB=y

# MQTT
CONFIG_MQTT_LIB=y
CONFIG_MQTT_LIB_TLS=n
CONFIG_MQTT_CLEAN_SESSION=y


# MQTT
CONFIG_MQTT_LIB=y
CONFIG_MQTT_LIB_TLS=n
CONFIG_MQTT_CLEAN_SESSION=y
CONFIG_MQTT_KEEPALIVE=3600
CONFIG_MQTT_LOG_LEVEL_DBG=y
CONFIG_ES401_LOG_LEVEL_DBG=y

#CONFIG_MQTT_LAST_WILL=y

CONFIG_AWS_IOT=y
CONFIG_AWS_IOT_LAST_WILL=y
CONFIG_AWS_IOT_LAST_WILL_TOPIC="89470060201013199369/connection/status"
CONFIG_AWS_IOT_LAST_WILL_MESSAGE="{'status': 'Failed'}"

# Application
# CONFIG_MQTT_PUB_TOPIC="my/publish/topic"
# CONFIG_MQTT_SUB_TOPIC="my/subscribe/topic"
# CONFIG_MQTT_CLIENT_ID="my-client-id"
# CONFIG_MQTT_BROKER_HOSTNAME="mqtt.eclipseprojects.io"
# CONFIG_MQTT_BROKER_PORT=1883

# Enable logging
CONFIG_LOG=y

# Memory
CONFIG_HEAP_MEM_POOL_SIZE=16384
CONFIG_MAIN_STACK_SIZE=16384
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=8192

# Time related library
CONFIG_DATE_TIME=y
#CONFIG_LEGACY_TIMEOUT_API=y


# Watchdog
CONFIG_WATCHDOG=y

# UART
CONFIG_SERIAL=y
CONFIG_UART_ASYNC_API=y
CONFIG_UART_CONSOLE=y
CONFIG_NRFX_UARTE1=y


# STRING LIBS
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_NEWLIB_LIBC_FLOAT_SCANF=y

# cJSON
CONFIG_CJSON_LIB=y

# GPIO
CONFIG_GPIO=y

# ADC
CONFIG_ADC=y
CONFIG_ADC_ASYNC=y
CONFIG_ADC_NRFX_SAADC=y

# I2C
CONFIG_I2C=y
CONFIG_I2C_NRFX=y
CONFIG_I2C_INIT_PRIORITY=60

# SPI
CONFIG_SPI=y
CONFIG_SPI_NRFX_RAM_BUFFER_SIZE=8


# General config
CONFIG_NCS_SAMPLES_DEFAULTS=y
CONFIG_REBOOT=y
CONFIG_TRUSTED_EXECUTION_NONSECURE=y

# Image manager
CONFIG_IMG_MANAGER=y
CONFIG_FLASH=y
CONFIG_IMG_ERASE_PROGRESSIVELY=y

# FOTA library
CONFIG_FOTA_DOWNLOAD=y

# Download client
CONFIG_DOWNLOAD_CLIENT=y
CONFIG_DOWNLOAD_CLIENT_STACK_SIZE=4096
CONFIG_DOWNLOAD_CLIENT_LOG_LEVEL_DBG=y
CONFIG_DOWNLOAD_CLIENT_LOG_HEADERS=n
CONFIG_DOWNLOAD_CLIENT_MAX_FILENAME_SIZE=450
CONFIG_DOWNLOAD_CLIENT_MAX_HOSTNAME_SIZE=96

# DFU Target
CONFIG_DFU_TARGET=y

# Modem key management
CONFIG_MODEM_KEY_MGMT=y

# Application Upgrade support
CONFIG_BOOTLOADER_MCUBOOT=y

Ignore the following lines ...

CONFIG_AWS_IOT=y

CONFIG_AWS_IOT_LAST_WILL=y

CONFIG_AWS_IOT_LAST_WILL_TOPIC="89470060201013199369/connection/status"

CONFIG_AWS_IOT_LAST_WILL_MESSAGE="{'status': 'Failed'}"

[ovrebekk]

Hi David

There aren't any good examples for this unfortunately, but the implementation in the AWS driver shows you how to set it up:

#if defined(CONFIG_AWS_IOT_LAST_WILL)
    static struct mqtt_topic last_will_topic = {
        .topic.utf8 = CONFIG_AWS_IOT_LAST_WILL_TOPIC,
        .topic.size = sizeof(CONFIG_AWS_IOT_LAST_WILL_TOPIC) - 1,
        .qos = MQTT_QOS_0_AT_MOST_ONCE
    };
    static struct mqtt_utf8 last_will_message = {
        .utf8 = CONFIG_AWS_IOT_LAST_WILL_MESSAGE,
        .size = sizeof(CONFIG_AWS_IOT_LAST_WILL_MESSAGE) - 1
    };
    client->will_topic = &last_will_topic;
    client->will_message = &last_will_message;
#endif

You should be able to add the same code snippet to your own project. 

Best regards
Torbjørn

[David]

Thank you Torbjørn,

Do you have any idea where I should Implement this?

In the client or the broker connection?

David

[ovrebekk]

Hi David

You can add this wherever you initialize the client. 

As an example, in the mqtt_simple example you could add this code here, as a part of the client_init(..) function. 

Best regards
Torbjørn