"Error -303"

Question

noone Me 2021-4-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/801751-error-303

评论： noone Me 2021-4-14

采纳的回答： Christopher Stapels

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Hello to all,

I am a beginner but I can't solve my problem here is the code:

the one always returns me an error -303 and I can't find it

thank you very much for helping me

    String json = ThingSpeak.readRaw(THINGSPEAK_REGISTRY_CHANNEL_NUMBER, String("/feeds/?results=8000"), THINGSPEAK_REGISTRY_API_KEY);
    int statusCode = ThingSpeak.getLastReadStatus();

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Answer 1

Christopher Stapels 2021-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/801751-error-303#answer_674926

-303 is unable to parse resonse, which you can see in the library github.

8000 records seems like a lot of data for a device to parse. Can you explain why you need this meany records on teh device? We would reccomend writing a MATLAB script to write the answer you are calculating to a derived channel and reas fewer values from the derived channel to your device.

If you read fewer records, does the command still fail? Can you try the call from a web browser or postman and see what the results are?

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noone Me 2021-4-14

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Thanks for answering my call for help :)

As I said, I am a beginner and to answer your question: no, my channel has only 1 record and has 3 fields => field1 = Address , field2 = ID (channel) , field3 = API KEY

the content of these fields, I entered manually

I changed the code :

String json = ThingSpeak.readRaw(THINGSPEAK_REGISTRY_CHANNEL_NUMBER, String("/feeds/?results=1"), THINGSPEAK_REGISTRY_API_KEY);
int statusCode = ThingSpeak.getLastReadStatus();

but this does not change anything, I still have => statuscode = -303

thank you again

pS : sorry for my english ....

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