DNS not working in Azure RTOS

Alex Gal 1

Hi!

It is pretty disappointing but i have a problem right after installing AzureRTOS. I am going through the step by step install guide but i'm stuck. Could you help me with that? There is no such documentation about this error which is also disappointing.

Starting Azure thread

Initializing WiFi
        Module: ISM43362-M3G-L44-SPI
        Firmware revision: C3.5.2.5.STM
        Connecting to SSID 'Telekom-J9BC2k'
SUCCESS: WiFi connected to Telekom-J9BC2k

Initializing DHCP
        IP address: 192.168.1.71
        Gateway: 192.168.1.1
SUCCESS: DHCP initialized

Initializing DNS client
        DNS address: 192.168.1.1
SUCCESS: DNS client initialized

Initializing SNTP client
        SNTP server 0.pool.ntp.org
        FAIL: Unable to resolve DNS for SNTP Server 0.pool.ntp.org (0xa3)
ERROR: Failed to run the sntp client

I have only found similar stuff in the source code.

#define NX_SNTP_INVALID_SERVER_ADDRESS      (NX_SNTP_ERROR_CONSTANT | 0x0A) /* Invalid server type e.g. IPv4 or IPv6 incompatible.                          */

Checked with Wireshark: there is no clue of any NTP packets.

Thanks!

AshokPeddakotla-MSFT 34,616 Reputation points

2020-11-09T12:48:24.043+00:00

@Alex Gal Apologies for the inconvenience caused. Could you please share the doc which you are following?
Scott Azure RTOS 4,051 Reputation points

2020-11-09T17:00:06.177+00:00

Hi @AshokPeddakotla-MSFT - I am not sure what installing FileX has to do with this issue... did you mean to post a different link?

@Alex Gal what board are you using?
Alex Gal 1 Reputation point

2020-11-10T13:20:06.657+00:00
Thank you for your answer and sorry for my frustration!

Meanwhile, I made a quick fix:

sntp_address.nxd_ip_version = NX_IP_VERSION_V4; sntp_address.nxd_ip_address.v4 = 3286518677;

(manually overwrote the address with the NTP server address just to make it work, by the way its not a long term solution)

In this case I have followed this one: https://github.com/azure-rtos/getting-started/blob/master/STMicroelectronics/STM32L4_L4+/readme.md

@ScottLarson-6169 it is a B-L475E-IOT01A

Best regards
Scott Azure RTOS 4,051 Reputation points

2020-11-10T17:17:54.747+00:00

Hi @Alex Gal , in the older version , there is bug in SNTP in the b-l4s5 project. Are you using the latest code from github?
Ryan 276 Reputation points Microsoft Employee

2020-11-10T22:16:53.98+00:00

Hi @Alex Gal ,

As the program has failed to resolve the DNS for the NTP server (error: DNS query failed; no DNS server sent an 'answer'), it stops execution, it doesnt even send out the NTP request.

With wireshark, do you see the DNS request and response for the 0.pool.ntp.org lookup?

Ryan
Alex Gal 1 Reputation point

2020-11-14T15:35:20.77+00:00

No, and generally the DNS is not working. (as you described) The error is: NX_DNS_QUERY_FAILED.

Previously I could connect to the cloud but at the moment I cannot connect to the cloud also.

Inspecting the network with Wireshark there are some answers because I added additional DNS servers with the standard driver function.

Is it possible that my gateway is tricking me? On a different WiFi network, I had no problem connecting to the cloud.

Additional debug messages:
Alex Gal 1 Reputation point

2020-11-14T15:36:35.837+00:00

Yes, I cloned it from the repo.
Ryan 276 Reputation points Microsoft Employee

2020-11-16T19:37:08.07+00:00

Thanks for the debug information.

I'm unsure what is happening. In the first screenshot, I don't see any IPv4 requests, so if this was logged during the time the device was trying to resolve DNS, then it appears it isn't sending out the request.

Could you verify that you are able to capture ipv4 DNS requests/response in wireshark at the time the device is requesting?
AshokPeddakotla-MSFT 34,616 Reputation points

2020-11-20T15:55:48.647+00:00

@Alex Gal Did you get a chance to see ryanwinter latest response? do let us know if that helps.

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DNS not working in Azure RTOS

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