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Thingspeak library failure with returned Error codes! with cryptic meanings?
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May 22, 2016 - 5:40 pm
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EmbarassedI'm new here and trying to post to a new channel via the Arduino IDE and a NodeMcu 0.9 ESP8266 board. I can post direct from a browser and see the results OK BUT when I run some code via the 

#include <ThingSpeak.h>

library e.g. the lines below... 

ThingSpeak.setField(1, float(20.2));
ThingSpeak.setField(2, float(23.4));
int ExitCode = ThingSpeak.writeFields(MyTSChannelNumber, MyTSWriteAPIKey);
if (ExitCode == 200)
Serial.print (" 200=Success! ");
Serial.print (" 🙁 Thingspeak Error Code = "); Serial.print(ExitCode);

I get a -302 error code!  and of course no data is written. Otherwise I am quite close to getting something done.

This is a "#define ERR_UNEXPECTED_FAIL     -302    // Unexpected failure during write to ThingSpeak"

Can anyone help with demystifying the library exit code or see a problem in what I have done? How can I test things better. I get a -301 when I sever the connection which is what I would expect.


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