SMS Notification

1// Tested with: ESP32 DevKit 
2#include <WiFi.h>
3#include <HTTPClient.h>
4
5// ================= WIFI =================
6const char *ssid     = "YOUR_WIFI_SSID";     // Place your WiFi SSID here
7const char *password = "YOUR_WIFI_PASSWORD"; // Place your WiFi password here
8
9// ================= API DETAILS =================
10const char* apiKey       = "YOUR_API_KEY"; // Place your Circuit Digest Cloud API key here
11const char* templateID   = "103";
12const char* mobileNumber = "91xxxxxxxxxx"; // Fill with your mobile number (country code + number)
13const char* var1         = "Test";
14const char* var2         = "ESP32";
15
16// ================= FLAG =================
17bool smsSent = false;
18
19// ================= SEND SMS FUNCTION =================
20void sendSMS() {
21
22  if (WiFi.status() != WL_CONNECTED) {
23    Serial.println(" WiFi Not Connected!");
24    return;
25  }
26
27  HTTPClient http;
28
29  String url = "http://www.circuitdigest.cloud/api/v1/send_sms?ID=" + String(templateID);
30
31  Serial.println("Connecting to server...");
32  http.begin(url);
33
34  http.addHeader("Content-Type", "application/json");
35  http.addHeader("Authorization", apiKey);
36
37  String payload =
38    "{\"mobiles\":\"" + String(mobileNumber) +
39    "\",\"var1\":\"" + String(var1) +
40    "\",\"var2\":\"" + String(var2) + "\"}";
41
42  Serial.println("\n Sending SMS...");
43  Serial.println(payload);
44
45  int httpCode = http.POST(payload);
46
47  Serial.print("HTTP Code: ");
48  Serial.println(httpCode);
49
50  if (httpCode > 0) {
51    String response = http.getString();
52    Serial.println(response);
53    Serial.println(" SMS Sent!");
54  } else {
55    Serial.println("Failed to send SMS");
56  }
57
58  http.end();
59}
60
61// ================= SETUP =================
62void setup() {
63  Serial.begin(115200);
64  delay(2000);
65
66  Serial.println("Connecting to WiFi...");
67  WiFi.begin(ssid, password);
68
69  while (WiFi.status() != WL_CONNECTED) {
70    delay(500);
71    Serial.print(".");
72  }
73
74  Serial.println("\n WiFi Connected!");
75  Serial.print("IP: ");
76  Serial.println(WiFi.localIP());
77
78  // SEND ONLY ONCE AFTER BOOT
79  if (!smsSent) {
80    delay(3000);  // optional delay before sending
81    sendSMS();
82    smsSent = true;
83  }
84}
85
86// ================= LOOP =================
87void loop() {
88  // nothing here (prevents repeat)
89}