Devspace Documentation

1#include <WiFi.h>
2#include <PubSubClient.h>
3#include <ArduinoJson.h>
4
5// ============================================================
6// 🔧 CONFIGURATION - CUSTOMIZE WITH YOUR DATA!
7// ============================================================
8
9// WiFi Credentials
10const char* WIFI_SSID = "your-wifi-ssid";
11const char* WIFI_PASSWORD = "your-wifi-password";
12
13// MQTT Broker (Devspace)
14const char* MQTT_BROKER = "mqtt.devspace.id";
15const int MQTT_PORT = 1883;
16
17// MQTT Credentials (from Device Detail Dashboard)
18const char* MQTT_CLIENT_ID = "dev_your-client-id";       
19const char* MQTT_USERNAME = "mqtt_your-username";        
20const char* MQTT_PASSWORD = "your-mqtt-password";        
21
22// Sensor ID (from Sensor List Dashboard)
23const char* SENSOR_ID = "your-sensor-uuid";              
24
25// ============================================================
26// 🔌 OBJECTS & VARIABLES
27// ============================================================
28
29WiFiClient espClient;
30PubSubClient mqttClient(espClient);
31
32const int SENSOR_PIN = 34;           // Sensor Pin (adjust as needed)
33const long SEND_INTERVAL = 5000;     // Send data every 5 seconds
34unsigned long lastSendTime = 0;
35
36// Topics
37String DATA_TOPIC;    
38String STATUS_TOPIC;  
39
40void setup() {
41  Serial.begin(115200);
42  
43  // Setup WiFi
44  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
45  while (WiFi.status() != WL_CONNECTED) {
46    delay(500);
47    Serial.print(".");
48  }
49  Serial.println("\nWiFi Connected!");
50
51  // Setup MQTT
52  DATA_TOPIC = "devspace/" + String(MQTT_CLIENT_ID) + "/data";
53  STATUS_TOPIC = "devspace/" + String(MQTT_CLIENT_ID) + "/status";
54
55  mqttClient.setServer(MQTT_BROKER, MQTT_PORT);
56}
57
58void reconnect() {
59  while (!mqttClient.connected()) {
60    Serial.print("Connecting to MQTT...");
61    if (mqttClient.connect(MQTT_CLIENT_ID, MQTT_USERNAME, MQTT_PASSWORD)) {
62      Serial.println("Connected!");
63      mqttClient.publish(STATUS_TOPIC.c_str(), "online");
64    } else {
65      Serial.print("failed, rc=");
66      Serial.print(mqttClient.state());
67      delay(5000);
68    }
69  }
70}
71
72void loop() {
73  if (!mqttClient.connected()) {
74    reconnect();
75  }
76  mqttClient.loop();
77
78  // Send Data Periodically
79  unsigned long now = millis();
80  if (now - lastSendTime > SEND_INTERVAL) {
81    lastSendTime = now;
82
83    // Read Sensor (Example: Random value)
84    float value = random(200, 300) / 10.0; 
85
86    // Create JSON Payload
87    StaticJsonDocument<200> doc;
88    doc["sensorId"] = SENSOR_ID;
89    doc["value"] = value;
90    
91    char jsonBuffer[200];
92    serializeJson(doc, jsonBuffer);
93
94    // Publish
95    mqttClient.publish(DATA_TOPIC.c_str(), jsonBuffer);
96    Serial.println(jsonBuffer);
97  }
98}

1Connecting to WiFi...
2WiFi Connected!
3Connecting to MQTT...Connected!
4{"sensorId":"your-uuid","value":25.5}
5{"sensorId":"your-uuid","value":25.6}

1{
2  "sensorId": "YOUR-SENSOR-UUID",
3  "value": 25.5,
4  "unit": "celsius" // Optional
5}