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In this article:

  • View the registry connection log
  • View the device connection log
  1. Step-by-step guides
  2. Viewing the connection log

Viewing the connection log

Written by
Yandex Cloud
Updated at June 11, 2025
  • View the registry connection log
  • View the device connection log

The log contains information about connecting/disconnecting devices and errors. You can view connection logs for the registry and devices. Time is specified in UTC.

View the registry connection logView the registry connection log

The registry connection log contains information about operations performed with the registry certificate. Operations of devices that belong to this registry are not included in this log.

Management console
CLI
  1. In the management console, select the folder to view the registry connection log in.
  2. Select IoT Core.
  3. Select the registry with the required device from the list.
  4. On the left side of the window, select the Logs section.

When viewing the log, you can set a specific time interval using the --since and --until parameters. If you do not specify a time interval, the log will show info for the last hour.

Using parameters:

  • --since: Time N and later.

  • --until: Time N and earlier.

If you only specify a single parameter, you will see info for one hour before or after time N, depending on the parameter.

You can use one of these time formats:

  • HH:MM:SS, e.g., 15:04:05.

  • RFC-3339, e.g., 2006-01-02T15:04:05Z, 2h, or 3h30m ago.

If you do not have the Yandex Cloud CLI installed yet, install and initialize it.

By default, the CLI uses the folder specified when creating the profile. To change the default folder, use the yc config set folder-id <folder_ID> command. You can also set a different folder for any specific command using the --folder-name or --folder-id parameter.

  1. Get a list of registries in a folder.

  2. View the registry connection log:

    yc iot registry logs my-registry
    

    Result:

    2019-09-19 18:51:02     connected, cert: "94ea0421199ec70f1f3d359a1c167a81********", address: "77.88.**.***:53171", clientID: "YCCmdLine"
    2019-09-19 18:51:02     some of subscriptions failed: not allowed to subscribe: ["$device/areqjd6un3af********/events"]
    2019-09-19 18:52:30     disconnected: client disconnected
    2019-09-19 18:52:36     connected, cert: "94ea0421199ec70f1f3d359a1c167a81********", address: "77.88.**.***:53198", clientID: "YCCmdLine"
    2019-09-19 18:52:36     some of subscriptions failed: not allowed to subscribe: ["$device/areqjd6un3af********/events"]
    2019-09-19 18:52:54     disconnected: client disconnected
    2019-09-19 18:52:58     connected, cert: "94ea0421199ec70f1f3d359a1c167a81********", address: "77.88.**.***:53209", clientID: "YCCmdLine"
    2019-09-19 18:53:32     disconnected: client disconnected
    

View the device connection logView the device connection log

The device connection log contains information about operations performed with the device certificate.

Management console
CLI
  1. In the management console, select the folder to view the device connection log in.
  2. Select IoT Core.
  3. Select the registry with the required device from the list.
  4. On the left side of the window, select the Devices section.
  5. Select the device from the list.
  6. On the left side of the window, select the Logs section.

When viewing the log, you can set a specific time interval using the --since and --until parameters. If you do not specify a time interval, the log will show info for the last hour.

Using parameters:

  • --since: Time N and later.

  • --until: Time N and earlier.

If you only specify a single parameter, you will see info for one hour before or after time N, depending on the parameter.

You can use one of these time formats:

  • HH:MM:SS, e.g., 15:04:05.

  • RFC-3339, e.g., 2006-01-02T15:04:05Z, 2h, or 3h30m ago.

If you do not have the Yandex Cloud CLI installed yet, install and initialize it.

By default, the CLI uses the folder specified when creating the profile. To change the default folder, use the yc config set folder-id <folder_ID> command. You can also set a different folder for any specific command using the --folder-name or --folder-id parameter.

  1. Get a list of devices in a registry.

  2. View the device connection log:

    yc iot devices logs my-device
    

    Result:

    2019-09-19 18:52:03     connected, cert: "ea7bd563e2352ad87e2aca529cfe3d0c********", address: "77.88.**.***:53189", clientID: "YCCmdLine"
    2019-09-19 18:52:03     disconnected: publish to topic "$device/areqjd6un3af********/events" not allowed
    2019-09-19 18:52:38     connected, cert: "ea7bd563e2352ad87e2aca529cfe3d0c********", address: "77.88.**.***:53201", clientID: "YCCmdLine"
    2019-09-19 18:52:38     disconnected: publish to topic "$device/areqjd6un3af********/events" not allowed
    2019-09-19 18:52:51     connected, cert: "ea7bd563e2352ad87e2aca529cfe3d0c********", address: "77.88.**.***:53206", clientID: "YCCmdLine"
    2019-09-19 18:52:51     disconnected: client disconnected
    2019-09-19 18:53:01     connected, cert: "ea7bd563e2352ad87e2aca529cfe3d0c********", address: "77.88.**.***:53213", clientID: "YCCmdLine"
    2019-09-19 18:53:01     disconnected: client disconnected
    2019-09-19 18:53:03     connected, cert: "ea7bd563e2352ad87e2aca529cfe3d0c********", address: "77.88.**.***:53217", clientID: "YCCmdLine"
    2019-09-19 18:53:03     disconnected: client disconnected
    2019-09-19 18:53:04     connected, cert: "ea7bd563e2352ad87e2aca529cfe3d0c********", address: "77.88.**.***:53220", clientID: "YCCmdLine"
    2019-09-19 18:53:04     disconnected: client disconnected
    

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