Clear Filters
Clear Filters

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

1 view (last 30 days)
my code
int x = ThingSpeak.writeFields(myChannelNumber[ChID], myWriteAPIKey[ChID]);
  1 Comment
Vinod on 16 Jun 2021
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?

Sign in to comment.

Accepted Answer

Barnard Richards
Barnard Richards on 17 Jun 2021
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.
Vinod on 17 Jun 2021
Edited: Vinod on 17 Jun 2021
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.
Barnard Richards
Barnard Richards on 18 Jun 2021
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.

Sign in to comment.

More Answers (0)


More Answers in the  ThingSpeak Community


Find more on Read Data from Channel in Help Center and File Exchange




Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!