Time from NTP server

[Rajender]

Hi,

Im using nrf9160 based custom board, nrf sdk 1.5.1.

I want to get the time from NTP servers, for that i connected to CATM1 n/w, connected to NTP server using UDP Protocol, but im not understanding what is the request i should make for NTP server to get present EPOCH, 

Please share any example if available.

i have tried sntp_client example (zephyr/samples/net/sockets/sntp_client) but when i run my code its directly going into fault_s.S after spm_jump() function.

Best Regards

Rajender

[Håkon Alseth]

Hi,

 

You have two options for fetching NTP:

* Use the DATE_TIME library: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.7.0/nrf/libraries/others/date_time.html?highlight=date_time

You can find a reference implementation in asset_tracker (look at "date_time" references): https://github.com/nrfconnect/sdk-nrf/blob/v1.5.1/applications/asset_tracker/src/main.c

* Use SNTP directly, by adjusting the configuration.

Replace the sntp_client/prj.conf with these lines: 

https://github.com/nrfconnect/sdk-nrf/blob/v1.5.1/samples/nrf9160/udp/prj.conf#L7-L29

Then set the IP to the ntp server here: 

https://github.com/nrfconnect/sdk-zephyr/blob/master/samples/net/sockets/sntp_client/src/config.h#L17-L19

example: ntp.uio.no resolves to ipv4 address "129.240.2.6"

i have tried sntp_client example (zephyr/samples/net/sockets/sntp_client) but when i run my code its directly going into fault_s.S after spm_jump() function.

This is due to the default configuration of the zephyr samples, where they assume native network. You have to adjust the configuration as mentioned above.

 

Kind regards,

Håkon

[Rajender]

Hi,

I have tried again, but now its getting error as "Failed to send over UDP socket -1"

[Håkon Alseth]

My apologies. I forgot to add:

CONFIG_LTE_AUTO_INIT_AND_CONNECT=y

 

Kind regards,

Håkon

[Rajender]

Hi,

after adding "CONFIG_LTE_AUTO_INIT_AND_CONNECT=y" my prj.conf file looks like this.

# General config
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_NCS_SAMPLES_DEFAULTS=y
CONFIG_SERIAL=n

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

# LTE link control
CONFIG_LTE_LINK_CONTROL=y
CONFIG_LTE_AUTO_INIT_AND_CONNECT=n

# Modem library
CONFIG_NRF_MODEM_LIB=y

# Heap and stacks
CONFIG_HEAP_MEM_POOL_SIZE=1024
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

# SNTP
CONFIG_SNTP=y

CONFIG_LTE_AUTO_INIT_AND_CONNECT=y

In this example i haven't seen any network connectivity code, so where i can find the same, and how i can check my IP address after network connection.

Now my Control not even entering into src/main file, may be its waiting for the Connectivity, so how can i check that?

[Håkon Alseth]

Hi,

 

Rajender said:

In this example i haven't seen any network connectivity code, so where i can find the same, and how i can check my IP address after network connection.

Now my Control not even entering into src/main file, may be its waiting for the Connectivity, so how can i check that?

When CONFIG_LTE_AUTO_INIT_AND_CONNECT=y is set, it will wait in the lte_lc driver on boot-up before main is entered. Once main is entered, the link shall be up and running.

 

Rajender said:

In this example i haven't seen any network connectivity code, so where i can find the same, and how i can check my IP address after network connection.

 You can use this library to obtain this information:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.7.0/nrf/libraries/modem/modem_info.html

but then I would also recommend that you look at date_time library as well, which I linked to in my former post.

 

Kind regards,

Håkon

[Rajender]

Hi,

Now i can get the time from ntp server (time1.google.com) using sntp, but i want to get the time from at%xtime=1 also,

I am sending this %xtime command after network connected and got ip address, but still im getting nothing but "OK" as a response, what would be the reason for this?

Best Regards

Rajender

[Håkon Alseth]

Hi,

 

Rajender said:

Now i can get the time from ntp server (time1.google.com) using sntp, but i want to get the time from at%xtime=1 also,

I am sending this %xtime command after network connected and got ip address, but still im getting nothing but "OK" as a response, what would be the reason for this?

I'm glad to hear that you got ntp running.

The %XTIME enables a notification, so it is important that you enable this notification early in the process.

This can require that you enable the notification prior to connecting to the modem, ie. by setting CONFIG_LTE_AUTO_INIT_AND_CONNECT=n in your prj.conf and connecting to the network in main, something similar to this:

https://github.com/nrfconnect/sdk-nrf/blob/v1.7.0/samples/nrf9160/mqtt_simple/src/main.c#L506-L545

 

Kind regards,

Håkon