Getting -310 error on simple MathWorks ThingSpeak get temperature example

Getting -310 error on simple MathWorks ThingSpeak get temperature example. (I simplified the example to include only the read from the public site)

Code is below.

Monitor output is at bottom of post.

Any ideas on why I'm getting the -310 would be greatly appreciated!

#include "ThingSpeak.h"
#include <Ethernet.h>
#include "secrets.h"

byte mac[] = SECRET_MAC;

// Set the static IP address to use if the DHCP fails to assign

byte    ip[] =      {  
  192, 168, 0, 199 };   

EthernetClient client;

// Weather station channel details
unsigned long weatherStationChannelNumber = SECRET_CH_ID_WEATHER_STATION;
unsigned int temperatureFieldNumber = 4;

void setup() {
  Serial.begin(9600L);  //Initialize serial
  delay (4000);  //WVC
  // start the Ethernet connection:
  Serial.println("Initialize Ethernet");
  Ethernet.begin(mac, ip);
    // Check for Ethernet hardware present
    if (Ethernet.hardwareStatus() == EthernetNoHardware) {
      Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
      while (true) {
        delay(1); // do nothing, no point running without Ethernet hardware
      }
    }
    if (Ethernet.linkStatus() == LinkOFF) {
      Serial.println("Ethernet cable is not connected.");
    }
    // try to congifure using IP address instead of DHCP:
//    Ethernet.begin(mac, ip, myDns);     //WVC
  
  // give the Ethernet shield a second to initialize:
  delay(1000);
  
  Serial.println("initialize TS");
  ThingSpeak.begin(client);  // Initialize ThingSpeak
}

void loop() {

  int statusCode = 0;
  
  // Read in field 4 of the public channel recording the temperature
  float temperatureInF = ThingSpeak.readFloatField(weatherStationChannelNumber, temperatureFieldNumber);  

  // Check the status of the read operation to see if it was successful
  statusCode = ThingSpeak.getLastReadStatus();
  if(statusCode == 200){
    Serial.println("Temperature at MathWorks HQ: " + String(temperatureInF) + " deg F");
  }
  else{
    Serial.println("Problem reading channel. HTTP error code " + String(statusCode)); 
  }
  
  delay(15000); // No need to read the temperature too often.

}

------------------ monitor output is below ----------------------

Initialize Ethernet

Initialize TS

Problem reading channel: HTTP error code -301

Problem reading channel: HTTP error code -301

Problem reading channel: HTTP error code -301

...

Answer 1

[Christopher Stapels]

I got a -301 error when I didnt have the Ethernet cable plugged in, but now it is working fine on an arduino Uno with ethernet Shield (Sainsmart)

Perhaps check the connection, and the ethernet address (in the secrets file) to see if you are overlapping with an existing device?

[Wade Campbell]

Thanks. I never would have figured it out -- my ethernet cable connector broke and it slid out of the router! It's the last thing I would have checked, until you sent your answer. I feel like a ditz!

Thanks!

[Christopher Stapels]

Glad you got it! I seriously did forget to plug it in first. The errors from the library with negative numbers are not http errors, but extra messages from the library. Thanks for letting us know you got it working.

[tebraxin tebraxin]

Do you mean the cable has to connect before start arduino ??

I try both, calbe is also anytime connected before and afetr restart, but I always get error 301....

thanks

[Christopher Stapels]

It would be best to have the cable connected at all times, just in case. I would check the wifi connection using software if possible. USe the Serial Monitor to output the result of the cennection.

One user found a timeout setting that helped in this discussion.

Answer 2

[Christopher Stapels]

What hardware you are using? We will try to reproduce the error.

EDIT I am sttempting to verify the error with an arduino Uno with an Ethernet shield.

[Wade Campbell]

custom board: ATmega 328 with Wiznet 812MJ ethernet module

Looking forward to hearing your results!

Answer 3

[Wade Campbell]

custom board: ATmega 328 with Wiznet 812MJ ethernet module