Contents of Channel Status Updates disappears

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Jan 2022-7-14

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https://ww2.mathworks.cn/matlabcentral/answers/1760355-contents-of-channel-status-updates-disappears

回答： Christopher Stapels 2022-7-20

Hi,

my Channel Status Updates show the right data for a while. After a few hours without sending status data, the Channel Status Updates window becomes empty. Is this the intended behaviour? I would prefer to keep the data, even if it is a few hours old.

Jan

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Answer 1

Christopher Stapels 2022-7-20

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在 MATLAB Online 中打开

Is this true after refreshing the page? The channel status updates widget shows onlu the last 24 hours of status.

You could create a custom MATLAB visualization to display more.

Heres some code to show the last 8 results (may need some tweaking though)

url='https://api.thingspeak.com/channels/592680/status.json?results=8';
out=webread(url);
myTab=struct2table(out.feeds);
disp(myTab.(3));
    {' servoClose fill 200 sec   sleep 1500 Seconds.json'}
    {' servoClose  servoOpen  off Work .json'            }
    {' servoClose  servoOpen  off Work .json'            }
    {' servoClose  servoOpen  off Work .json'            }
    {' servoClose fill 200 sec   sleep 1500 Seconds.json'}
    {' servoClose fill 200 sec   sleep 1500 Seconds.json'}
    {'.json'                                             }
    {' servoClose fill 200 sec   sleep 1500 Seconds.json'}

see the status API for more helpful parameters.

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Jan 2022-7-20

Thank you, Christpher. The 24 hrs limitation is my problem. It's not clear to me why it is there. My application monitors rare events so that I get an empty status box most of the time.

I will look deeper into your code lines later.

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Answer 2

Christopher Stapels 2022-7-20

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I thnk the idea was to remove noise if you had a system that reports everytime (like the system on the channel in the code I shared.) Since there is a seperate status API, you can get the custom time frame or number of entries that you want, and there is less motivation for changing the status widget.