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mqtt_esp32_client/mqtt_esp32_client.ino
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266
mqtt_esp32_client/mqtt_esp32_client.ino
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#include <WiFi.h>
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#include <PubSubClient.h>
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#include <ArduinoJson.h> // 用于JSON操作
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// ----------- 设备配置 (需要为您自己的设备和环境修改) -----------
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// WiFi
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const char *ssid = "xxxxx"; // 请输入您的 Wi-Fi 名称
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const char *password = "xxxxx"; // 请输入您的 Wi-Fi 密码
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// MQTT Broker
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const char *mqtt_broker = "broker.emqx.io"; // 您的 MQTT Broker 地址
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const char *mqtt_username = "emqx"; // 您的 MQTT 用户名 (如果需要)
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const char *mqtt_password = "public"; // 您的 MQTT 密码 (如果需要)
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const int mqtt_port = 1883; // 您的 MQTT 端口
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// 设备唯一标识符 (非常重要, 必须与后端注册的一致)
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const char *spotUid = "ESP32_SPOT_001"; // 例如: "SPOT001", "P005-A1" 等
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// ----------- MQTT 主题定义 -----------
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// 上行 (ESP32 -> 后端)
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String topic_status_update; // 状态上报: charging/spot/{spotUid}/status
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String topic_command_ack; // 指令回执: charging/spot/{spotUid}/command/ack
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String topic_heartbeat; // 心跳: charging/spot/{spotUid}/heartbeat
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// 下行 (后端 -> ESP32, ESP32需要订阅这些)
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String topic_command_start; // 启动充电: charging/spot/{spotUid}/command/start
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String topic_command_stop; // 停止充电: charging/spot/{spotUid}/command/stop
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// String topic_command_query_status; // 查询状态 (可选): charging/spot/{spotUid}/command/query_status
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// ----------- 全局变量 -----------
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WiFiClient espClient;
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PubSubClient client(espClient);
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// 模拟硬件状态 (实际项目中需要从传感器或硬件逻辑获取)
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const char* currentDeviceStatus = "IDLE"; // 设备当前状态: IDLE, CHARGING, FAULTED 等
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float currentVoltage = 220.0;
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float currentCurrent = 0.0;
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float currentPower = 0.0;
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float currentEnergyConsumed = 0.0;
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int currentErrorCode = 0;
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String currentSessionId = ""; // 当前充电会话ID
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// 定时发送相关
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unsigned long lastStatusUpdateTime = 0;
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unsigned long lastHeartbeatTime = 0;
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const long statusUpdateInterval = 30000; // 状态上报间隔 (例如: 30秒)
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const long heartbeatInterval = 60000; // 心跳间隔 (例如: 60秒)
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void setup_mqtt_topics() {
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String baseTopic = "charging/spot/" + String(spotUid) + "/";
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topic_status_update = baseTopic + "status";
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topic_command_ack = baseTopic + "command/ack";
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topic_heartbeat = baseTopic + "heartbeat";
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topic_command_start = baseTopic + "command/start";
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topic_command_stop = baseTopic + "command/stop";
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// topic_command_query_status = baseTopic + "command/query_status";
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Serial.println("MQTT 主题初始化完成:");
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Serial.println(" 状态上报: " + topic_status_update);
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Serial.println(" 指令回执: " + topic_command_ack);
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Serial.println(" 心跳: " + topic_heartbeat);
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Serial.println(" 订阅启动指令: " + topic_command_start);
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Serial.println(" 订阅停止指令: " + topic_command_stop);
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}
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void connect_wifi() {
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Serial.println("正在连接 Wi-Fi...");
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WiFi.begin(ssid, password);
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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Serial.print(".");
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}
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Serial.println("\nWi-Fi 连接成功!");
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Serial.print("IP 地址: ");
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Serial.println(WiFi.localIP());
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}
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void reconnect_mqtt() {
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while (!client.connected()) {
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Serial.print("尝试连接 MQTT Broker: ");
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Serial.println(mqtt_broker);
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String client_id = "esp32-client-" + String(spotUid) + "-";
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client_id += String(WiFi.macAddress());
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Serial.printf("客户端 ID: %s \n", client_id.c_str());
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if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
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Serial.println("MQTT Broker 连接成功!");
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// 重新订阅主题
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client.subscribe(topic_command_start.c_str());
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Serial.println("已订阅: " + topic_command_start);
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client.subscribe(topic_command_stop.c_str());
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Serial.println("已订阅: " + topic_command_stop);
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// if (topic_command_query_status.length() > 0) client.subscribe(topic_command_query_status.c_str());
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// (可选) 连接成功后立即发送一次状态
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publish_status_update();
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} else {
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Serial.print("连接失败, rc=");
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Serial.print(client.state());
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Serial.println(" 2秒后重试...");
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delay(2000);
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}
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}
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}
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void callback(char *topic, byte *payload, unsigned int length) {
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Serial.println("-----------------------");
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Serial.print("消息抵达, 主题: ");
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Serial.println(topic);
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char message[length + 1];
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memcpy(message, payload, length);
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message[length] = \'\\0\'; // 添加字符串结束符
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Serial.print("消息内容: ");
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Serial.println(message);
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StaticJsonDocument<256> doc; // 适当调整JSON文档大小
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DeserializationError error = deserializeJson(doc, message);
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if (error) {
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Serial.print("JSON 解析失败: ");
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Serial.println(error.f_str());
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return;
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}
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const char* commandId = doc["commandId"]; // 提取 commandId 用于回执
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// 根据主题处理指令
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if (String(topic) == topic_command_start) {
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Serial.println("接收到 [启动充电] 指令");
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// 实际硬件操作: 启动充电
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// 例如: digitalWrite(RELAY_PIN, HIGH);
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currentDeviceStatus = "CHARGING";
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if (doc.containsKey("sessionId")) {
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currentSessionId = String(doc["sessionId"].as<const char*>());
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}
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Serial.println("模拟: 充电已启动。会话ID: " + currentSessionId);
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publish_command_ack(commandId, true, "Charging started successfully");
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publish_status_update(); // 立即更新状态
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} else if (String(topic) == topic_command_stop) {
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Serial.println("接收到 [停止充电] 指令");
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// 实际硬件操作: 停止充电
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// 例如: digitalWrite(RELAY_PIN, LOW);
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currentDeviceStatus = "COMPLETED"; // 或者 "IDLE"，取决于逻辑
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Serial.println("模拟: 充电已停止。");
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publish_command_ack(commandId, true, "Charging stopped successfully");
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currentSessionId = ""; // 清除会话ID
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publish_status_update(); // 立即更新状态
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}
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// else if (String(topic) == topic_command_query_status) {
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// Serial.println("接收到 [查询状态] 指令");
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// publish_status_update(); // 回复当前状态
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// publish_command_ack(commandId, true, "Status reported");
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// }
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else {
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Serial.println("未知指令主题");
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}
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Serial.println("-----------------------");
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}
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void publish_message(const String& topic, const JsonDocument& doc, const char* message_type) {
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String jsonBuffer;
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serializeJson(doc, jsonBuffer);
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Serial.print("发送 ");
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Serial.print(message_type);
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Serial.print(" 到主题 [");
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Serial.print(topic);
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Serial.print("]: ");
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Serial.println(jsonBuffer);
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if (client.publish(topic.c_str(), jsonBuffer.c_str())) {
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Serial.println(String(message_type) + " 发送成功");
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} else {
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Serial.println(String(message_type) + " 发送失败");
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}
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}
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void publish_status_update() {
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StaticJsonDocument<512> doc; // 适当调整JSON文档大小
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doc["spotUid"] = spotUid;
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doc["timestamp"] = String(WiFi.getTime()); // 需要NTP同步时间才能获取正确UTC时间，此处仅为示例
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doc["status"] = currentDeviceStatus;
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doc["voltage"] = currentVoltage;
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doc["current"] = currentCurrent;
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doc["power"] = currentPower;
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doc["energyConsumed"] = currentEnergyConsumed;
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doc["errorCode"] = currentErrorCode;
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if (currentSessionId.length() > 0) {
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doc["sessionId"] = currentSessionId;
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} else {
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doc["sessionId"] = nullptr; // 或者不包含此字段
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}
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publish_message(topic_status_update, doc, "状态更新");
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lastStatusUpdateTime = millis();
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}
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void publish_heartbeat() {
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StaticJsonDocument<256> doc; // 适当调整JSON文档大小
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doc["spotUid"] = spotUid;
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doc["timestamp"] = String(WiFi.getTime()); // 同上，NTP时间问题
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doc["status"] = currentDeviceStatus; // 心跳中也带上当前状态
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publish_message(topic_heartbeat, doc, "心跳");
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lastHeartbeatTime = millis();
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}
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void publish_command_ack(const char* commandId, bool success, const char* message) {
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if (!commandId || strlen(commandId) == 0) {
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Serial.println("无法发送ACK: commandId 为空");
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return;
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}
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StaticJsonDocument<256> doc; // 适当调整JSON文档大小
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doc["commandId"] = commandId;
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doc["spotUid"] = spotUid;
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doc["status"] = success ? "SUCCESS" : "FAILURE";
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doc["message"] = message;
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publish_message(topic_command_ack, doc, "指令回执");
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}
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void setup() {
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Serial.begin(115200);
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Serial.println("\nESP32 充电桩模拟客户端启动...");
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setup_mqtt_topics(); // 初始化MQTT主题
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connect_wifi(); // 连接Wi-Fi
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client.setServer(mqtt_broker, mqtt_port);
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client.setCallback(callback); // 设置消息回调函数
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}
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void loop() {
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if (!client.connected()) {
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reconnect_mqtt(); // 如果MQTT未连接，则重连
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}
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client.loop(); // 维持MQTT连接和处理消息
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unsigned long currentTime = millis();
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// 定时发送状态更新
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if (currentTime - lastStatusUpdateTime > statusUpdateInterval) {
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// 在实际项目中，这里应该先更新 currentVoltage, currentCurrent 等状态值
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// 例如: currentVoltage = readVoltageSensor();
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publish_status_update();
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}
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// 定时发送心跳
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if (currentTime - lastHeartbeatTime > heartbeatInterval) {
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publish_heartbeat();
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}
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// 模拟充电过程中的电量和功率变化 (仅为演示)
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if (String(currentDeviceStatus) == "CHARGING") {
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currentEnergyConsumed += 0.01; // 假设每秒消耗0.01kWh (不精确，仅为演示)
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currentCurrent = 5.0; // 假设充电电流5A
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currentPower = (currentVoltage * currentCurrent) / 1000.0; // kW
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// 注意：实际项目中这些值应来自传感器或充电控制器
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// 这里为了演示，每隔一段时间简单更新一下
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} else {
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currentCurrent = 0.0;
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currentPower = 0.0;
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}
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delay(100); // 短暂延时，避免loop过于频繁，给其他任务一点时间 (可选)
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}
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