[在使用Arduino MQTT客户端时,我观察到,当我发布一个主题时,消息立即发送到代理。我在mqtt.fx工具的帮助下确认了这一点。从经纪人收到有关同一主题的消息时,经过长时间的延迟,我得到了已发布的消息。我正在使用在Openhab 2.5上配置的Mosquitto代理]
这是我正在使用的代码:
#include <Arduino.h> #include <ESP8266WiFi.h> #include <PubSubClient.h> #include <Wire.h> #include <SeeedOLED.h> const char* ssid = "Network"; const char* password = "NetworkPass"; #define mqtt_server "OpenhabIP" WiFiClient espClient; PubSubClient client(espClient); void reconnect() { while (!client.connected()) { Serial.print("Attempting MQTT connection..."); if (client.connect("ESP8266Client","user","pass")) { Serial.println("connected"); }else{ Serial.print("failed, rc="); Serial.print(client.state()); Serial.println(" try again in 5 seconds"); delay(5000); } } } void callback(char* topic, byte* payload, unsigned int length){ char k=(char)payload[0]; if(k=='0'){ SeeedOled.clearDisplay(); SeeedOled.setNormalDisplay(); SeeedOled.setPageMode(); SeeedOled.setTextXY(0, 0); SeeedOled.putString("Magnet"); }else{ SeeedOled.clearDisplay(); SeeedOled.setNormalDisplay(); SeeedOled.setPageMode(); SeeedOled.setTextXY(0, 0); SeeedOled.putString("No Magnet"); } } void setup() { pinMode(15, OUTPUT); //To enable Wio Link Board digitalWrite(15, 1); Serial.begin(9600); Wire.begin(4,5); SeeedOled.init(); WiFi.begin(ssid, password); Serial.print("Connecting"); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(); Serial.print("Connected, IP address: "); Serial.println(WiFi.localIP()); client.setServer(mqtt_server,1883); pinMode(3, INPUT); //Enable Input for hall sensor client.setCallback(callback); } void loop() { if (!client.connected()) { reconnect(); } client.loop(); client.publish("EntComp/HallSensor",String(digitalRead(3)).c_str(),true); client.subscribe("EntComp/HallSensor"); delay(1000); }
我已经在基于ESP8266-12E模块的Wio Node开发板上完成了所有这些工作。在不同的板上使用
client.subscribe()
和client.publish()
功能时,我面临相同的问题。我不明白为什么会有这么大的延迟。是因为代码中的错误还是我做错了?
[在使用Arduino MQTT客户端时,我观察到,当我发布一个主题时,消息立即发送到代理。我在mqtt.fx工具的帮助下确认了这一点。而...
您的代码中存在“巨大”延迟: