Retrieve data from TTN by using Python SDK

I have a problem in retrieving data from TTN by using Python SDK. I was using python SDK and having a problem. I run the example code from here I have changed the app_id and access_key in that code to my own.

This is the result when I run the code by using Anaconda Prompt:
SDK python

The problem is the data is not continue received from TTN.
Can any one help me?


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