[英]Unable to send publish messages from esp8266 to Raspberry (Broker) using MQTT. Getting Socket Error <Random Device Id>, Disconnecting
[英]connect two ESP8266 to one MQTT broker cause hang
我有2个ESP8266 PubSubClients,它们正在连接到安装在Raspberry PI3上的MQTT代理。 我可以连接它们并进行开/关操作,还可以! 但是当我要使用它们两者进行操作时,它将挂起并卡在重新连接的循环中,当我关闭其中之一时,它的工作正常。
这是我在ESP8266上的代码:
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
// Update these with values suitable for your network.
const char* ssid = "SSID";
const char* password = "PASSWORD";
const char* mqtt_server = "192.168.1.10";
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;
void setup() {
//pinMode(BUILTIN_LED, OUTPUT); // Initialize the BUILTIN_LED pin as an output
//Serial.begin(115200);
Serial.begin(9600);
pinMode(0, OUTPUT);
digitalWrite(0, HIGH);
pinMode(2, OUTPUT);
digitalWrite(2, HIGH);
pinMode(4, OUTPUT);
digitalWrite(4, HIGH);
pinMode(5, OUTPUT);
digitalWrite(5, HIGH);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
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(".");
}
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();
//1 ( pin 0 )
if (strcmp(topic,"/home/1/ard1/p1/com")==0) {
if (payload[0] == '0'){
digitalWrite(0, HIGH);
Serial.print("Turning Light ON");
delay(100);
client.publish("/home/1/ard1/p1/state","0");
}
else if (payload[0] == '1')
{
digitalWrite(0, LOW);
Serial.print("Turning Light OFF");
delay(100);
client.publish("/home/1/ard1/p1/state","1");
}
}
//2 ( pin 2 )
if (strcmp(topic,"/home/1/ard1/p2/com")==0) {
if (payload[0] == '0'){
digitalWrite(2, HIGH);
Serial.print("Turning Light ON");
delay(100);
client.publish("/home/1/ard1/p2/state","0");
}
else if (payload[0] == '1')
{
digitalWrite(2, LOW);
Serial.print("Turning Light OFF");
delay(100);
client.publish("/home/1/ard1/p2/state","1");
}
}
//3 ( pin 4 )
if (strcmp(topic,"/home/1/ard1/p3/com")==0) {
if (payload[0] == '0'){
digitalWrite(4, HIGH);
Serial.print("Turning Light ON");
delay(100);
client.publish("/home/1/ard1/p3/state","0");
}
else if (payload[0] == '1')
{
digitalWrite(4, LOW);
Serial.print("Turning Light OFF");
delay(100);
client.publish("/home/1/ard1/p3/state","1");
}
}
//4 ( pin 5 )
if (strcmp(topic,"/home/1/ard1/p4/com")==0) {
if (payload[0] == '0'){
digitalWrite(5, HIGH);
Serial.print("Turning Light ON");
delay(100);
client.publish("/home/1/ard1/p4/state","0");
}
else if (payload[0] == '1')
{
digitalWrite(5, LOW);
Serial.print("Turning Light OFF");
delay(100);
client.publish("/home/1/ard1/p4/state","1");
}
}
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect("ESP8266Client")) {
Serial.println("connected");
// Once connected, publish an announcement...
client.publish("outTopic", "hello world");
client.subscribe("/home/1/ard1/#");
// ... 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 loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
long now = millis();
if (now - lastMsg > 2000) {
lastMsg = now;
++value;
snprintf (msg, 75, "hello world #%ld", value);
Serial.print("Publish message: ");
Serial.println(msg);
client.publish("outTopic", msg);
}
}
我为其中之一更改了以下这些行,但结果是相同的。
WiFiClient espClient;
PubSubClient client(espClient);
至:
WiFiClient espClient1;
PubSubClient client(espClient1);
非常感谢。
您的问题是这一行:
if (client.connect("ESP8266Client")) {
每个客户端都需要一个唯一的客户端ID,将其硬编码到ESP8266Client
,这意味着当第二个客户端连接时,代理将启动第一个客户端,然后尝试重新连接,从而启动第二个客户端。 这最终陷入了循环。
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