nRF Connect: Azure IoT Hub: mqtt_helper: mqtt_connect, error: -22. native_sim board

[Andrei H.]

Hi,

 I'm trying to run `ncs/v2.6.1/nrf/samples/net/azure_iot_hub` sample with `native_sim` board:

1. certificates are configured (compiled in)

2. `zeth` interface is running

3. application fails to connect, `mqtt_connect, error: -22`

The certificates should be valid, using `DigiCert Global Root G2`

*** Booting nRF Connect SDK v3.5.99-ncs1-1 ***
[00:00:00.000,000] <inf> net_config: Initializing network
[00:00:00.000,000] <inf> net_config: IPv4 address: 192.0.2.1
[00:00:00.000,000] <inf> azure_iot_hub_sample: Azure IoT Hub sample started
[00:00:00.000,000] <inf> azure_iot_hub_sample: Bringing network interface up and connecting to the network
[00:00:00.000,000] <inf> azure_iot_hub_sample: Device ID: TEST_DEVICE_007
[00:00:00.000,000] <inf> azure_iot_hub_sample: Network connectivity established and IP address assigned
[00:00:00.000,000] <inf> azure_iot_hub_sample: Connected to network
[00:00:00.000,000] <inf> azure_iot_hub_sample: Starting DPS
[00:00:00.000,000] <dbg> azure_iot_hub_dps: dps_reg_id_set: Setting DPS registration ID: TEST_DEVICE_007
[00:00:00.000,000] <dbg> azure_iot_hub_dps: dps_id_scope_set: No ID scope provided, using ID scope from Kconfig: <DPS_ID_RED>
[00:00:00.000,000] <dbg> azure_iot_hub_dps: dps_id_scope_set: Setting DPS ID scope: <DPS_ID_RED>
[00:00:00.000,000] <dbg> azure_iot_hub_dps: dps_on_settings_loaded: Settings fully loaded
[00:00:00.000,000] <dbg> azure_iot_hub_dps: dps_state_set: State transition: DPS_STATE_UNINIT --> DPS_STATE_DISCONNECTED
[00:00:00.000,000] <inf> azure_iot_hub_sample: DPS registration status: AZURE_IOT_HUB_DPS_REG_STATUS_NOT_STARTED
[00:00:00.000,000] <dbg> azure_iot_hub_dps: provisioning_client_init: Client ID (size: 21): TEST_DEVICE_007
[00:00:00.000,000] <dbg> azure_iot_hub_dps: provisioning_client_init: User name (size: 70): <DPS_ID_RED>/registrations/TEST_DEVICE_007/api-version=2019-03-31
[00:00:00.000,000] <dbg> mqtt_helper: mqtt_state_set: State transition: MQTT_STATE_UNINIT --> MQTT_STATE_DISCONNECTED
[00:00:00.000,000] <dbg> mqtt_helper: broker_init: Resolving IP address for global.azure-devices-provisioning.net
DBG_PRINTF: [ncs/v2.6.1/zephyr/subsys/net/lib/mqtt/mqtt_transport_socket_tls.c:117]: mqtt_client_tls_connect err: -1
[00:00:00.000,000] <dbg> mqtt_helper: mqtt_helper_poll_loop: Waiting for connection_poll_sem
[00:00:00.720,000] <dbg> mqtt_helper: broker_init: IPv4 Address found 20.50.65.141 (AF_INET)
[00:00:00.720,000] <dbg> mqtt_helper: mqtt_state_set: State transition: MQTT_STATE_DISCONNECTED --> MQTT_STATE_TRANSPORT_CONNECTING
[00:00:00.720,000] <dbg> net_mqtt_sock_tls: mqtt_client_tls_connect: (0x80c4300): Created socket 0
[00:00:00.780,000] <err> mqtt_helper: mqtt_connect, error: -22
[00:00:00.780,000] <dbg> mqtt_helper: mqtt_state_set: State transition: MQTT_STATE_TRANSPORT_CONNECTING --> MQTT_STATE_DISCONNECTED
[00:00:00.780,000] <err> azure_iot_hub_dps: mqtt_helper_connect failed, error: -22
[00:00:00.780,000] <err> azure_iot_hub_sample: DPS failed to start, error: -22
[00:00:00.780,000] <err> azure_iot_hub_sample: Failed to run DPS, error: -22, terminating connection attempt

Log `*_RED` fields are edited.

Is there any way to debug this to understand where the problem might be?

Any help is appreciated. Regards.

[Naeem Maroof]

Hi Andrei,

I don't know what could be the case. The error -22 is invalid argument. Could be the name (user name or client name) is incorrect?

I will look into it.

[Andrei H.]

Hi Naeem,

 I'm not sure what is wrong with those since I've understood that:

1. "user name" == `CONFIG_AZURE_IOT_HUB_HOSTNAME` w/ extra streps

2. "client name" == `CONFIG_AZURE_IOT_HUB_DEVICE_ID` (aka `Client ID` in the log)

The log also shows this part:

[00:00:00.000,000] <dbg> azure_iot_hub_dps: provisioning_client_init: Client ID (size: 21): TEST_DEVICE_007
[00:00:00.000,000] <dbg> azure_iot_hub_dps: provisioning_client_init: User name (size: 70): <DPS_ID_RED>/registrations/TEST_DEVICE_007/api-version=2019-03-31

Regards.

[Naeem Maroof]

can you share your .config file from the ./build/zephyr/ folder.

[Andrei H.]

Hi Naeem,

Here is the requested file:

2438..config.txt

I hope this helps (I've redacted some fields, namely:

• CONFIG_AZURE_IOT_HUB_DEVICE_ID: (original string size 21 bytes)
• CONFIG_AZURE_IOT_HUB_HOSTNAME: (original string size 38 bytes)
• CONFIG_AZURE_IOT_HUB_DPS_ID_SCOPE: (original string size 11 bytes)

Best regards.

[Michal]

Hello,

I took over from Naeem, but I will need some time to do more tests.

In general that error means that there is something with the certificate.

I would recommend double-checking that the format is exactly as the one in the sample.

Also, I think there was a size limit of 2 kB for the certificate.

Best regards,

Michal