EspHome MQTT and PubSubClient clients do not connect to PicoMQTT running on ESP32-S3

[agozie]

Great project, I am able to connect and send data to the PicoMQTT broker from node-red and from mosquito-cli clients on my mac. But EspHome MQTT and PubSubClient running on an ESP8266 and ESP32-C3 could not connect. I know that I can use PicoMQTT as a client too but I have existing projects using PubSubClient and EspHome that I want to use PicoMQTT as their broker. Here is my PubSubClient client code:

`#include

define BUILTIN_LED 12

define MQTT_VERSION 4

include

include

include

const char *ssid = ""; const char password = ""; const char *mqtt_server = "192.168.1.207";

WiFiClient espClient; PubSubClient client(espClient); unsigned long lastMsg = 0;

define MSG_BUFFER_SIZE (80)

char msg[MSG_BUFFER_SIZE]; int value = 0;

void setup_wifi() {

delay(1000); // We start by connecting to a WiFi network Serial.println(); Serial.print("Connecting to "); Serial.println(ssid);

WiFi.mode(WIFI_STA); 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 = "hubtest"; // clientId += String(random(0xffff), HEX); // Attempt to connect if (client.connect(clientId.c_str())) { 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 Serial.begin(115200); setup_wifi(); // client.setSocketTimeout(20000); client.setServer(mqtt_server, 1883); client.setCallback(callback); }

void loop() {

if (!client.connected()) { reconnect(); } client.loop();

// delay(100);

unsigned long now = millis(); if (now - lastMsg > 2000) { lastMsg = now; ++value; snprintf(msg, MSG_BUFFER_SIZE, "{\"hello\":\"#%ld\"}", value); Serial.print("Publish message: "); Serial.println(msg); client.publish("outTopic", msg); } }`

I get Attempting MQTT connection...failed, rc=-2 try again in 5 seconds with PubSubClient. I've spent 3 days already, trying to solve this.

[agozie]

This worked after restarting my router and wifi.