Asset_tracker_v2 problem: Failed to set legacy PCO mode

Hello,

I am very new at this. I have just started to work with the nrf9160DK board, I am using modem firmware 1.3.1, and nRF Connect SDK 1.8.0. I am trying to test asset_tracker_v2 application to connect the board to nrfcloud. Some changes are needed because I am in Uruguay (South America) so I must use NB-IoT, with Legacy PCO (ePCO is not supported).

I used menuconfig in order to modify .config (and I attached a .config file). Some modification are: CONFIG_LTE_MODE_PREFERENCE_NBIOT, CONFIG_LTE_NETWORK_MODE_NBIOT_GPS (for NB-IoT and GNSS), CONFIG_PDN_LEGACY_PCO (for legacy PCO), CONFIG_PDN_DEFAULT_FAM_IPV6 (PDN uses IPv6), CONFIG_LTE_LOCK_BANDS, CONFIG_LTE_LOCK_BAND_MASK (using certain bands), CONFIG_LTE_LOCK_PLMN, CONFIG_LTE_LOCK_PLMN_STRING (selecting Uruguayan network). Also, based on another ticket from Nordic, CONFIG_MODEM_JWT was modified and CONFIG_NRF_CLOUD_CLIENT_ID_SRC_INTERNAL_UUID was selected.

LTE connection is achieved, however, nrfcloud connection fails. After booting the DK board, the following warning appears: pdn: Failed to set legacy PCO mode, err 65536 and then cloud connection is not possible. So I tried AT%XEPCO? and the answer is 1 but I had expected a 0 (Legacy PCO), it is like CONFIG_PDN_LEGACY_PCO=y is not working. If I turn off the modem and send AT%XEPCO=0, when cloud connection is attempted the following error appears: nrf_cloud_transport: MQTT input error: -128.

First question is how to correctly set the legacy PCO mode. And secondly, how could I fix the MQTT connection.

Thanks a lot,

I apologize if I was not clear or if any information is missing.

Varinia Cabrera

Parents

0 Hakon over 3 years ago

Varinia Cabrera said:
I am really sorry but I am not understanding where you found # CONFIG_PDN is not set.

I found it in build/zephyr/.config when I tried building the application myself. This is what it looks like for me

3122..config

I didn't include all your kconfigs, as they most of them didn't seem relevant. This is the prj.conf file I use

#
# Copyright (c) 2021 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# General config
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_ASSERT=y
CONFIG_REBOOT=y
CONFIG_RESET_ON_FATAL_ERROR=n
CONFIG_FPU=y

# Heap and stacks
CONFIG_HEAP_MEM_POOL_SIZE=32768
CONFIG_MAIN_STACK_SIZE=1280
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096
CONFIG_HW_STACK_PROTECTION=y

# Logging
CONFIG_LOG=y

# DK - Used for buttons and LEDs in UI module.
CONFIG_DK_LIBRARY_INVERT_LEDS=n

# nRF modem library
CONFIG_NRF_MODEM_LIB=y

# AT Host library - Used to send AT commands directy from an UART terminal and to allow
#		    integration with nRF Connect for Desktop LTE Link monitor application.
CONFIG_AT_HOST_LIBRARY=y

# Network
CONFIG_NETWORKING=y
CONFIG_NET_NATIVE=n
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_OFFLOAD=y

# LTE link control
CONFIG_LTE_AUTO_INIT_AND_CONNECT=n
CONFIG_LTE_NETWORK_MODE_LTE_M_GPS=y
## Power saving timers.
### 320 hours PSM.
CONFIG_LTE_PSM_REQ_RPTAU="11000001"
### 20 seconds active time.
CONFIG_LTE_PSM_REQ_RAT="00001010"

# Modem info library to obtain information about network and device
CONFIG_MODEM_INFO=y

# Settings - Used to store real-time device configuration to flash.
CONFIG_SETTINGS=y
CONFIG_SETTINGS_FCB=y
CONFIG_FCB=y

# FOTA
CONFIG_FOTA_DOWNLOAD=y
CONFIG_DFU_TARGET=y
CONFIG_DOWNLOAD_CLIENT=y
CONFIG_DOWNLOAD_CLIENT_HTTP_FRAG_SIZE_1024=y
CONFIG_DOWNLOAD_CLIENT_STACK_SIZE=4096
CONFIG_DOWNLOAD_CLIENT_BUF_SIZE=2300
CONFIG_DOWNLOAD_CLIENT_MAX_HOSTNAME_SIZE=128

# Flash - Used in FOTA, settings and storage for P-GPS.
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y
CONFIG_STREAM_FLASH=y
CONFIG_MPU_ALLOW_FLASH_WRITE=y

# MCUBOOT
CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_IMG_MANAGER=y
CONFIG_MCUBOOT_IMG_MANAGER=y
CONFIG_IMG_ERASE_PROGRESSIVELY=y

# Watchdog
CONFIG_WATCHDOG_APPLICATION=y

# Event Manager
CONFIG_EVENT_MANAGER=y
CONFIG_LINKER_ORPHAN_SECTION_PLACE=y
CONFIG_EVENT_MANAGER_LOG_EVENT_TYPE=n

# cJSON - Used in cloud data encoding.
CONFIG_CJSON_LIB=y

# CAF - Common Application Framework
CONFIG_CAF=y
CONFIG_LED=y
CONFIG_CAF_LEDS=y
CONFIG_CAF_INIT_LOG_LED_READY_EVENTS=n
CONFIG_CAF_INIT_LOG_LED_EVENTS=n
CONFIG_CAF_INIT_LOG_MODULE_STATE_EVENTS=n

# Default cloud transport service
CONFIG_NRF_CLOUD_MQTT=y

CONFIG_PDN_LEGACY_PCO=y

It makes sense, because I can't see that CONFIG_PDN=y is set in prj.conf or using menuconfig.

You can try an advice from another thread with a similar issue;

When you are not auto-connecting during bootup, with this config:

CONFIG_LTE_AUTO_INIT_AND_CONNECT=n

You need to manually initialize the pdn library.

You should then set config "CONFIG_PDN_SYS_INIT=n" and call pdn_init() prior to calling "lte_lc_init_and_connect()".

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