Disable logging from prj.conf file

[PeterL]

Hi. I want to evaluate the current consumption of the nrf9160 module (I have a Thingy91) and I want to disable all logging functions. I started with the mqtt_simple example and added these lines to the prj.conf file:

CONFIG_LOG=n
CONFIG_SERIAL=n
CONFIG_STDOUT_CONSOLE=n
CONFIG_UART_INTERRUPT_DRIVEN=n

However, I get a compiler error: "undefined reference to z_impl_uart_irq_rx_enable" at line 129 in uart.h

Is this not the correct way of doing it? What am I missing? 

[Sigurd]

Hi,

It should be enough to set these:

CONFIG_LOG=n
CONFIG_SERIAL=n

[PeterL]

I still get the same error. I checked out a fresh copy of the mqtt_simple from the v1.1.0 tag. Then I added

CONFIG_LOG=n
CONFIG_SERIAL=n

to the proj.conf file in the nrf9160/mqtt_simple folder 

#
# Copyright (c) 2019 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
#
# General config
CONFIG_TEST_RANDOM_GENERATOR=y

# Logging
CONFIG_LOG=n
CONFIG_SERIAL=n

# 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

# BSD library
CONFIG_BSD_LIBRARY=y

# AT Host
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_AT_HOST_LIBRARY=y

# MQTT
CONFIG_MQTT_LIB=y
CONFIG_MQTT_LIB_TLS=n

# Appliaction
#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.eclipse.org"
#CONFIG_MQTT_BROKER_PORT=1883

# Main thread
CONFIG_MAIN_THREAD_PRIORITY=7
CONFIG_MAIN_STACK_SIZE=4096

CONFIG_HEAP_MEM_POOL_SIZE=2048

[Sigurd]

Try setting CONFIG_AT_HOST_LIBRARY=n

[PeterL]

That did the trick. Thank you.

However the average current consumption is toggling between 1,2 and 2,4 mA. I have added lte_lc_edrx_req(true); right after modem_configure(); in the mqtt_simple example.

I'm using CONFIG_LTE_EDRX_REQ_VALUE="0110". 

Shouldn't the current consumption at least be below 100uA? 

[Sigurd]

PeterL said:

CONFIG_LTE_EDRX_REQ_VALUE="0110". 

 Does the request eDRX value match the one you get from the network ? See this link