|
使用esp32-doit-dev-v1开发板,测试mqtt协议, 发布(publish)到onenet 平台。
注意:
1.使用的mqtt arduino 客户端是 pubsubclient 库。其默认是ESP8266, 所以例子例包换文件“Wifi8266.h”,可以改为"Wifi.h"就可以。
2.关键是按照mqtt的onenet文档,编制payload数据包。其具体格式有多种类型。调试的是最简单的type3, json数据2 形式。 - /*
- Basic ESP8266 MQTT example
- This sketch demonstrates the capabilities of the pubsub library in combination
- with the ESP8266 board/library.
- It connects to an MQTT server then:
- - publishes "hello world" to the topic "outTopic" every two seconds
- - subscribes to the topic "inTopic", printing out any messages
- it receives. NB - it assumes the received payloads are strings not binary
- - If the first character of the topic "inTopic" is an 1, switch ON the ESP Led,
- else switch it off
- It will reconnect to the server if the connection is lost using a blocking
- reconnect function. See the 'mqtt_reconnect_nonblocking' example for how to
- achieve the same result without blocking the main loop.
- To install the ESP8266 board, (using Arduino 1.6.4+):
- - Add the following 3rd party board manager under "File -> Preferences -> Additional Boards Manager URLs":
- http://arduino.esp8266.com/stable/package_esp8266com_index.json
- - Open the "Tools -> Board -> Board Manager" and click install for the ESP8266"
- - Select your ESP8266 in "Tools -> Board"
- */
- //改为<WiFi.h>
- #include <WiFi.h>
- #include <PubSubClient.h>
- #include <ArduinoJson.h>
- //#define BUILTIN_LED 2
- // Update these with values suitable for your network.
- const char* ssid = "热点ssid";
- const char* password = "连接密码";
- const char* mqtt_server = "183.230.40.39";
- WiFiClient espClient;
- PubSubClient client(espClient);
- long lastMsg = 0;
- char msg_buf[200];
- int value = 0; //
- //char one_type3_header[] = {'0x03','0x00','0x46'};
- char dataTemplete[]="{"temperature":25.5,"time":%d}";
- char msgJson[75];
- char debug_buf[200];
- int i;
- unsigned short json_len=0;
- uint8_t* packet_p;
- uint8_t debug_buffer_start_index = 0;
- void setup_wifi() {
- delay(10);
- // We start by connecting to a WiFi network
- Serial.println();
- Serial.print("Connecting to ");
- Serial.println(ssid);
- WiFi.begin(ssid, password);
- while (WiFi.status() != WL_CONNECTED) {
- delay(500);
- Serial.print(".");
- }
- randomSeed(micros());
- Serial.println("");
- Serial.println("WiFi connected");
- Serial.println("IP address: ");
- Serial.println(WiFi.localIP());
- }
- void callback(char* topic, byte* payload, unsigned int length) {
- Serial.print("Message arrived [");
- Serial.print(topic);
- Serial.print("] ");
- for (int i = 0; i < length; i++) {
- Serial.print((char)payload[i]);
- }
- Serial.println();
- // Switch on the LED if an 1 was received as first character
- if ((char)payload[0] == '1') {
- digitalWrite(BUILTIN_LED, LOW); // Turn the LED on (Note that LOW is the voltage level
- // but actually the LED is on; this is because
- // it is active low on the ESP-01)
- } else {
- digitalWrite(BUILTIN_LED, HIGH); // Turn the LED off by making the voltage HIGH
- }
- }
- void reconnect() {
- // Loop until we're reconnected
- while (!client.connected()) {
- Serial.print("Attempting MQTT connection...");
- // Create a random client ID
- //String clientId = "设备_id";
- //clientId += String(random(0xffff), HEX);
- // Attempt to connect
- if (client.connect("设备id","产品_id","API_key")) { //One net user name as product ID , and password as APIKey
- Serial.println("connected");
- // Once connected, publish an announcement...
- client.publish("outTopic", "hello world");
- // ... and resubscribe
- client.subscribe("inTopic");
- } else {
- Serial.print("failed, rc=");
- Serial.print(client.state());
- Serial.println(" try again in 5 seconds");
- // Wait 5 seconds before retrying
- delay(5000);
- }
- }
- }
- void setup() {
- pinMode(BUILTIN_LED, OUTPUT); // Initialize the BUILTIN_LED pin as an output, where do it esp32 get gpio2 as led
- Serial.begin(115200);
- setup_wifi();
- client.setServer(mqtt_server, 6002); //not 1883 , one net use the port of 6002 as mqtt server
- client.connect("设备Id","产品id","API_key");
- client.setCallback(callback);
- }
- void loop() {
- if (!client.connected()) {
- reconnect();
- }
- client.loop();
- long now = millis();
- if (now - lastMsg > 2000) {
- lastMsg = now;
- ++value;
- //snprintf (msgJson, 75, "hello world #%ld", value);
- snprintf(msgJson,40,dataTemplete,22);
- json_len=strlen(msgJson); //packet length count the end char '\0'
- msg_buf[0]=char(0x03); //palyLoad packet byte 1, one_net mqtt Publish packet payload byte 1, type3 , json type2
- msg_buf[1]=char(json_len>>8); //high 8 bits of json_len (16bits as short int type)
- msg_buf[2]=char(json_len&0xff); //low 8 bits of json_len (16bits as short int type)
- // snprintf(msg_buf+3,40,dataTemplete,value);
-
- memcpy(msg_buf+3,msgJson,strlen(msgJson));
- msg_buf[3+strlen(msgJson)] = 0;
- Serial.print("Publish message: ");
- Serial.println(msgJson);
- client.publish("$dp",msg_buf,3+strlen(msgJson),false); // msg_buf as payload length which may have a "0x00"byte
-
- //debug one_net packet
- packet_p = client.getBufferPointer();
- for(i = 0 ; i< 200;i++)
- {
- //sprintf(debug_buf,"0x%02x ",msg_buf[i]);
- sprintf(debug_buf,"0x%02x ",packet_p[i]);
- Serial.print(debug_buf);
- }
- Serial.println();
- for(i = 0 ; i< 200;i++)
- {
- sprintf(debug_buf,"0x%02x ",msg_buf[i]);
- //sprintf(debug_buf,"0x%02x ",packet_p[i]);
- Serial.print(debug_buf);
- }
- Serial.println();
- debug_buffer_start_index=client.getDebugVar();
- Serial.println(debug_buffer_start_index);
- }
- }
复制代码
附带略有修改publish方法的PubSubClient 库文件。
|
本帖子中包含更多资源
您需要 登录 才可以下载或查看,没有帐号?注册
x
|