Getting nRF5340DK + W5500 Ethernet Shield with MQTT + TLS to work

[makoto.inoue]

Hi,

I am working on a setup where nRF5340 uses W5500 Ethernet IC and communicate MQTT over TLS. The actual setup for now is nrf5340dk + w5500 ethernet shield.

I am working with the nrf/samples/networking/mqtt sample (NCS version 2.6.0), with slight modification (added DHCP and modified one of the Kconfig settings).

I have managed to get it to work without TLS (without the overlay-tis-nrf53.conf added to the build in the attached project).

However when I add the TLS overlay file I get -123 (unknown protocol) error during mqtt_connect.

I ran a debug session and it seems to error (-123) during a call to:

client->transport.tls.sock = zsock_socket(broker->sa_family,
						  type, IPPROTO_TLS_1_2);

in mqtt_transport_socket_tls.c (line 32).

I'm guessing something is not correctly setup in Kconfig? 

I have attached the zipped project. I'd appreciate if someone can help me.

Best Regards,

Makoto

4628.mqtt_260.zip

[Øyvind]

Hello, 

The W5500 is not part of the Nordic product line and is therefor a little more tricky to answer for. There are several questions in the forum asking about nRF5340 and W5500. I would recommend reaching out to the Zephyr community on Discord regarding W5500. 

Could you add CONFIG_MQTT_HELPER_LOG_LEVEL_DBG=y to your project? This could hopefully provide more information. Can you also share full logs from your side?

Thanks.

Kind regards,
Øyvind

[makoto.inoue]

Hi Øyvind,

Thank you for your help. Below is the log I see after turning on CONFIG_MQTT_HELPER_LOG_LEVEL_DBG=y in my project.

[00:00:00.391,387] <inf> eth_w5500: W5500 Initialized
*** Booting nRF Connect SDK v3.5.99-ncs1 ***
[00:00:00.398,040] <inf> network: Bringing network interface up and connecting to the network
[00:00:00.398,101] <inf> network: DHCP Client Start on w5500: index=1
[00:00:00.398,986] <dbg> mqtt_helper: mqtt_state_set: State transition: MQTT_STATE_UNINIT --> MQTT_STATE_DISCONNECTED
[00:00:00.399,414] <dbg> mqtt_helper: mqtt_helper_poll_loop: Waiting for connection_poll_sem
[00:00:00.503,906] <inf> network: Network connectivity established
[00:00:03.933,990] <inf> net_dhcpv4: Received: 192.168.10.5
[00:00:03.934,234] <inf> network:    Address[1]: 192.168.10.5
[00:00:03.934,295] <inf> network:     Subnet[1]: 255.255.255.0
[00:00:03.934,326] <inf> network:     Router[1]: 192.168.10.1
[00:00:03.934,356] <inf> network: Lease time[1]: 86400 seconds
[00:00:05.504,425] <dbg> mqtt_helper: broker_init: Resolving IP address for test.mosquitto.org
[00:00:06.627,777] <dbg> mqtt_helper: broker_init: IPv4 Address found 91.121.93.94 (AF_INET)
[00:00:06.627,838] <dbg> mqtt_helper: certificates_provision: CA certificate already exists, sec tag: 955
[00:00:06.627,868] <dbg> mqtt_helper: mqtt_state_set: State transition: MQTT_STATE_DISCONNECTED --> MQTT_STATE_TRANSPORT_CONNECTING
[00:00:06.627,899] <err> mqtt_helper: mqtt_connect, error: -123
[00:00:06.627,960] <dbg> mqtt_helper: mqtt_state_set: State transition: MQTT_STATE_TRANSPORT_CONNECTING --> MQTT_STATE_DISCONNECTED
[00:00:06.627,960] <err> transport: Failed connecting to MQTT, error code: -123

[makoto.inoue]

Hi, can I get any further help on this?

I've tried to post in the Zephyr Discord, but got no response.

I saw this thread, which seems like an example that would help, but I still can't get mine to work...

Best Regards,

Makoto

[Øyvind]

Hi Makoto, 

No, I'm afraid that I have not had more time to look into this. The thread you pointed to is the closest and possibly the best answer at the moment. 

Kind regards,
Øyvind