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

my code

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

[Vinod]

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?

Answer 1

[Barnard Richards]

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]

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]

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.