ThingHTTP call to Twilio results in "AccountSid or AuthToken was incorrect"

I am using the example (to send an SMS from an Arduino) at https://www.instructables.com/id/Send-SMS-from-Arduino-over-the-Internet-using-ENC2/

I have triple checked the Twilio credentials entered into the ThingHTTP project and the ThingHTTP project's API key.

The Arduino code and the serial output text are below...

/*
Send SMS from Arduino over the Internet using ENC28J60 and Thingspeak
Change one line to use with ethernet shield
Add sensor readings in the loop and a time interval
Using Arduino UIP library from https://github.com/ntruchsess/arduino_uip

Code based on Sparkfun's data logging service data.sparkfun.com
URL encode function from http://hardwarefun.com/tutorials/url-encoding-in-arduino

*/


#include <SPI.h>

//change the following line to #include <Ethernet.h> to use the eithent shield
#include <Ethernet.h> 

// Enter a MAC address for your controller below.
byte mac[] = { 0x00, 0x24, 0xd6, 0x7f, 0xa2, 0x54 };

//thingspeak server
char server[] = "api.thingspeak.com";

//if DHCP fails, use a static IP
IPAddress ip(192,168,0,199);

// Initialize the Ethernet client library
EthernetClient client;

//API key for the Thingspeak ThingHTTP already configured
const String apiKey = "<<my API code fromn ThingHTTP project>>";  

//the number the message should be sent to
const String sendNumber = "<<my cell phone number>>";    // format "+1nnnnnnnnnn"

void setup()
{
  Serial.begin(9600);

  //set up Ethernet:
  setupEthernet();
  
  //send the sms
  Serial.println("Sending SMS");
  
  //this function will send the sms
  //the first argument is the number to send to, formatted like this [phone]
  //the second argument is the body of the text message, which must be within URLEncode()
  sendSMS(sendNumber, URLEncode("Hello World!"));

}

void loop()
{

}


void sendSMS(String number,String message)
{
  // Make a TCP connection to remote host
    Serial.print(F("server: "));
    Serial.println(server);
//    Serial.print("client.connect(server,80): ");
//    Serial.println(client.connect(server, 80));
  if (client.connect(server, 80))
  {

    //should look like this...
    //api.thingspeak.com/apps/thinghttp/send_request?api_key={api key}&number={send to number}&message={text body}
    Serial.println("client.connect(server, 80) is true");
    client.print("GET /apps/thinghttp/send_request?api_key=");
    client.print(apiKey);
    client.print("&number=");
    client.print(number);
    client.print("&message=");
    client.print(message);
    client.println(" HTTP/1.1");
    client.print("Host: ");
    client.println(server);
    client.println("Connection: close");
    client.println();

    Serial.print("GET /apps/thinghttp/send_request?api_key=");
    Serial.print(apiKey);
    Serial.print("&number=");
    Serial.print(number);
    Serial.print("&message=");
    Serial.print(message);
    Serial.println(" HTTP/1.1");
    Serial.print("Host: ");
    Serial.println(server);
    Serial.println("Connection: close");
    Serial.println();

    
    Serial.println(F("TS Connection succeeded"));
  }
  else
  {
    Serial.println(F("TS Connection failed"));
  } 

  // Check for a response from the server, and route it
  // out the serial port.
  if (client.connected()) {
    Serial.println(F("Server response..."));
  }
  while (client.connected())
  {
    if ( client.available() )
    {
      char c = client.read();
      Serial.print(c);
    }      
  }
  Serial.println();
  Serial.println("End of reading from server");
  client.stop();
}



void setupEthernet()
{
  Serial.println("Setting up Ethernet...");
  // start the Ethernet connection:
  if (Ethernet.begin(mac) == 0) {
    Serial.println(F("Failed to configure Ethernet using DHCP"));
    // no point in carrying on, so do nothing forevermore:
    // try to congifure using IP address instead of DHCP:
    Ethernet.begin(mac, ip);
  }
  Serial.print("My IP address: ");
  Serial.println(Ethernet.localIP());
  // give the Ethernet shield a second to initialize:
  delay(1000);
}

String URLEncode(const char* msg)
{
  const char *hex = "0123456789abcdef";
  String encodedMsg = "";

  while (*msg!='\0'){
    if( ('a' <= *msg && *msg <= 'z')
      || ('A' <= *msg && *msg <= 'Z')
      || ('0' <= *msg && *msg <= '9') ) {
      encodedMsg += *msg;
    } 
    else {
      encodedMsg += '%';
      encodedMsg += hex[*msg >> 4];
      encodedMsg += hex[*msg & 15];
    }
    msg++;
  }
  return encodedMsg;
}

[Wade Campbell]

Would appreciate some help on this. Any suggestions/theories???

[Wade Campbell]

Got it. Pilot error... Twilio account id and auth code had a space at the end that should not have been there. Didn't realize double clicking a number selected the number with a space at the end.

Answer 1

[Vinod]

Thanks for sharing your code and the solution in your comment.

Looks like you were able to figure out the solution before we could get to your query.