Page tree

Versions Compared


  • This line was added.
  • This line was removed.
  • Formatting was changed.


titleI see the message "appId mis-match, possible device hi-jacking." what does it mean?
  1. When a device authenticates with an application token, an appId is specified during authentication.  This value is stored along with the thing, and subsequent connections must re-use this appId.
  2. When authenticating through HTTP(S) or HTTP, the appId is specified during authentication.
  3. When authenticating via MQTT, the appId is mapped to the MQTT Client_ID field.
  4. If a client connects using a particular thing key, and the appId changes, the authentication will fail, and you will see the message "appId mismatch, possible device hi-jacking." in the Event log for the thing.
    This error signals that a malicious user is attempting to hijack or duplicate the device without permission.  If this is not the case, it is possible to reset the appId in the Portal by clicking the unlock button on the thing's details page. Unlocking the appId will allow an application to reconnect and set the new appId or to reset the appId using the API, see thing.appid.reset.
  5. If you have 2 applications attempting to connect with the same thing key, then one will be allowed to connect and the other will receive a similar "appId mismatch" error.


titleHow to open CSV to in Microsoft Excel?

 CSV (comma separated values) is a common format used in the Management Portal to download a list of rows or records. The following section explains how to open a CSV file in excel:

  1. Open a new Excel workbook.

  2. On the Data tab, in the Data Tools group, click From Text.

  3. Select the CSV file you want to open.
  4. Click Import.
    Text Import Wizard - Step 1 of 3 appears.

  5. Select Delimited.

  6. Click Next.
    Text Import Wizard - Step 2 of 3

  7. Select Comma

  8. Click Next.
    Text Import Wizard - Step 3 of 3 appears.

  9. Select the columns with numbers and change the Column data format from General to Text

  10. Click Finish.