simple mqtt and mqtt publisher not working.

[Y0g1]

Hi i was trying to use simple mqtt sample provided as example with location "ncs/nrf/samples/nrf9160/mqtt_simple" the code was build and run but during lte connection it takes aroung 5-10 minutes and after that it was failed to connect with mqtt client i tried by default defined "mqtt.eclipse.org" and some other brokers but everytime gives me error 

*** Booting Zephyr OS build v2.4.0-ncs1  ***The MQTT simple sample startedLTE Link Connecting ...+CEREG: 2,"FFFE","FFFFFFFF",7,0,0,"11100000","11100000"+CEREG: 0,"FFFE","FFFFFFFF",7,0,0,"11100000","11100000"+CEREG: 2,"00D8","003AC006",9,0,0,"11100000","11100000"+CSCON: 1+CEREG: 5,"00D8","003AC006",9,,,"11100000","11100000"LTE Link Connected!IPv4 Address found 198.41.30.194ERROR: mqtt_connect -60

i search for the error it was showing timeout error but doen't help me as i didn't find to resolve it.

after this i was also trying the other sample code mqtt publisher at location "zephyr/samples/net/mqtt_publisher". the code build and programmed but after that device rebooting again and again with following error 

Non-secure callable region 0 placed in flash region 0 with size 32.

.

can you please guide me for the mqtt code. as my requirent is to publish some messages on server after regular time intervals and how to make it faster connect with lte. please reply asap.

[Hakon]

Hello,

you can print out more detailed debug information with these to lines in prj.conf,

CONFIG_NET_LOG=y
CONFIG_MQTT_LOG_LEVEL_DBG=y

[Y0g1]

already done ang logs were shared before and i am sharing again as below

** Booting Zephyr OS build v2.4.0-ncs1  
***Flash regionsDomainPermissions00 00 0x00000 0x08000 
Securerwxl01 31 0x08000 0x100000 Non-SecurerwxlNon-secure callable region 0 placed in flash region 0 with size 32.SRAM region
DomainPermissions00 07 0x00000 0x10000 Securerwxl08 31 0x10000 0x40000 Non-SecurerwxlPeripheralDomainStatus
00 NRF_P0               Non-SecureOK01 NRF_CLOCK            Non-SecureOK02 NRF_RTC0             
Non-SecureOK03 NRF_RTC1             Non-SecureOK04 NRF_NVMC             
Non-SecureOK05 NRF_UARTE1           Non-SecureOK06 NRF_UARTE2           
SecureSKIP07 NRF_TWIM2            Non-SecureOK08 NRF_SPIM3            
Non-SecureOK09 NRF_TIMER0           Non-SecureOK10 NRF_TIMER1          
Non-SecureOK11 NRF_TIMER2           Non-SecureOK12 NRF_SAADC            
Non-SecureOK13 NRF_PWM0             Non-SecureOK14 NRF_PWM1             
Non-SecureOK15 NRF_PWM2             Non-SecureOK16 NRF_PWM3             
Non-SecureOK17 NRF_WDT              Non-SecureOK18 NRF_IPC              
Non-SecureOK19 NRF_VMC              Non-SecureOK20 NRF_FPU              
Non-SecureOK21 NRF_EGU1             Non-SecureOK22 NRF_EGU2             
Non-SecureOK23 NRF_DPPIC            Non-SecureOK24 NRF_GPIOTE1          
Non-SecureOK25 NRF_REGULATORS       Non-SecureOK
SPM: NS image at 0xc000SPM: NS MSP at 0x20025cf0
SPM: NS reset vector at 0x102fd
SPM: prepare to jump to Non-Secure image.
*** Booting Zephyr OS build v2.4.0-ncs1  
***The MQTT simple sample startedLTE Link Connecting ...
+CEREG: 2,"FFFE","FFFFFFFF",7,0,0,"11100000","11100000"
+CEREG: 0,"FFFE","FFFFFFFF",7,0,0,"11100000","11100000"
[00:10:00.264,862] [0m<inf> lte_lc: Network connection attempt timed out[0m[00:10:00.277,221] 
[0m<inf> lte_lc: Using fallback network mode
[0m+CEREG: 2,"C0D8","003AC006",9,0,0,"11100000","11100000"+CSCON: 1
+CEREG: 5,"C0D8","003AC006",9,,,"11100000","11100000"
LTE Link Connected!
attempting to connect: IPv4 Address found 64.111.109.81
[00:10:28.337,097] [0m<dbg> net_mqtt_sock_tcp.mqtt_client_tcp_connect: (0x20023010): Created socket 1
[0mmqtt_connect -60IPv4 Address found 64.111.109.81
[00:10:52.344,268] [0m<dbg> net_mqtt_sock_tcp.mqtt_client_tcp_connect: (0x20023010): Created socket 1
[0mmqtt_connect -60IPv4 Address found 64.111.109.81
[00:11:16.852,569] 
[0m<dbg> net_mqtt_sock_tcp.mqtt_client_tcp_connect: (0x20023010): Created socket 1
[0mmqtt_connect -60IPv4 Address found 64.111.109.81
[00:11:41.359,893] [0m<dbg> net_mqtt_sock_tcp.mqtt_client_tcp_connect: (0x20023010): Created socket 1
[0mmqtt_connect -60IPv4 Address found 64.111.109.81
[00:12:05.866,271] [0m<dbg> net_mqtt_sock_tcp.mqtt_client_tcp_connect: (0x20023010): Created socket 1
[0mmqtt_connect -60IPv4 Address found 64.111.109.81
[00:12:30.374,389] [0m<dbg> net_mqtt_sock_tcp.mqtt_client_tcp_connect: (0x20023010): Created socket 1

[Hakon]

The log says "lte_lc: Using fallback network mode". What is the fallback network mode set to?

[Y0g1]

no idea how can i check that out?

[Hakon]

There is a kconfig option for it. Can you post prj.conf?

[Y0g1]

Here is my pr.conf settings

# General config
CONFIG_TEST_RANDOM_GENERATOR=y

# Networking
CONFIG_NETWORKING=y
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
CONFIG_LTE_LEGACY_PCO_MODE=y
CONFIG_NRF_CLOUD_IPV6=y

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

# Main thread
CONFIG_MAIN_THREAD_PRIORITY=7
CONFIG_MAIN_STACK_SIZE=4096

CONFIG_HEAP_MEM_POOL_SIZE=1024

# Disable native network stack to save some memory
CONFIG_NET_IPV4=n
CONFIG_NET_IPV6=n
CONFIG_NET_UDP=n
CONFIG_NET_TCP=n

CONFIG_DEBUG_OPTIMIZATIONS=y 
CONFIG_LEGACY_TIMEOUT_API=y
#CONFIG_NET_LOG=y
#CONFIG_MQTT_LOG_LEVEL_DBG=y

please give some more suggestion n help me to solve the issue it taking too long.

[Hakon]

Can you check the network mode with the XSYSTEMMODE command?

[Y0g1]

the network mode is nbiot mode we can communicate with mosquitto but ohter website server gives same mqtt error -60. help us to resolve it.

[Hakon]

Have you checked that the network supports TCP? Most NB-IoT networks don't support TCP communication, and MQTT uses TCP as transport layer.

[Y0g1]

if thats the case it should not work with mosuitto either. correct me if m wrong with mosquitto we are using mqtt if it doesn't support tcp how it will work with it?

[Hakon]

The MQTT broker hostname has recently been changed to "mqtt.eclipseprojects.io". You can try with that. And you should also set CONFIG_LTE_NETWORK_MODE_NBIOT=y in prj.conf.