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 +12345678901 //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; }
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