How do I calculate the total number of bytes in my upload write to a Thingspeak channel

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Barnard Richards 2021-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/857785-how-do-i-calculate-the-total-number-of-bytes-in-my-upload-write-to-a-thingspeak-channel

评论： Barnard Richards 2021-6-18

采纳的回答： Barnard Richards

my code

int x = ThingSpeak.writeFields(myChannelNumber[ChID], myWriteAPIKey[ChID]);

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Vinod 2021-6-16

ThingSpeak library handles calculation of payload size and formatting it as needed. Could you help me understand the use case for knowing the number of bytes of the upload -- if available, how would you use this information?

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Answer 1

Barnard Richards 2021-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/857785-how-do-i-calculate-the-total-number-of-bytes-in-my-upload-write-to-a-thingspeak-channel#answer_726605

I am going to be evaluating a Arduino MKR NB1500 to upload to a Thingspeak channel.

The Cell phone companies charge for the number of bytes transmitted. I want to know how many bytes i might be able to economically upload with particular SIM card account.

I know a Thingspeak message is limited to 3000 bytes.

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Vinod 2021-6-17

编辑：Vinod 2021-6-17

在 MATLAB Online 中打开

Uncomment the following #define in the ThingSpeak library, and it will print out the exact details of what is sent to ThingSpeak servers. You can then calculate the bytes sent.

#define PRINT_DEBUG_MESSAGES

Barnard Richards 2021-6-18

Thanks Vinod,

My suggestion is that it would also be useful for Thingspeak to consider adding a get_data_length function to the Thingspeak library which can be called from the Arduino sketch.

but thanks again.

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