ESP32 is three times slower than ESP8266 with MQTT and TCP related stuff

Community General Discussion
1

Hardware:

Board: ESP32 from D32 board from Lolin
Core Installation version: 1.0.6
IDE name: Platformio (platform-espressif32 v.3.2.1)
LIB Used: pubsubclient for MQTT, world most used MQTT lib I think (v2.8)
Flash Frequency: 40Mhz
PSRAM enabled: no
Upload Speed: 500.000 or 1.000.000 or 2.000.000
Computer OS: Windows 10 and Ubuntu

Description:

ESP32 is at least 3 times slower than ESP8266 when using MQTT or TCP more in general.
I have created a sketch that subscribe to an MQTT topic and increment a counter, every five seconds print the number of received message per second.

With ESP32 that sketch goes up to 45 messages per second,
ESP8266 scores 145 messages per second.

Sketch:

This is a really small sketch that shows the problem, it works on both ESP8266 and ESP32

#if defined(ESP8266)
#include <ESP8266WiFi.h>
#else
#include <WiFi.h>
#endif
#if defined(ESP8266)
#include <ESP8266WebServer.h>
#else
#include <WebServer.h>
#endif
#include <PubSubClient.h>
#include <FastLED.h>

const char *mqtt_server = "192.168.1.3"; //mqtt server
const char *ssid = "XXX";
const char *password = "XXX";
float framerate = 0;
float framerateCounter = 0;

WiFiClient espClient;
PubSubClient client(espClient); //lib required for mqtt

void callback(char *topic, byte *payload,
              unsigned int length) {   //callback includes topic and payload ( from which (topic) the payload is comming)
  framerateCounter++;

}

void reconnect() {
  while (!client.connected()) {
    Serial.println("Attempting MQTT connection...");
    if (client.connect("ESP32_clientID")) {
      Serial.println("connected");
      client.subscribe("lights/glowwormluciferin/set/stream"); //topic=Demo
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}


void connectmqtt() {
  client.connect("ESP32_clientID");  // ESP will connect to mqtt broker with clientID
  {
    Serial.println("connected to MQTT");
    client.subscribe("lights/glowwormluciferin/set/stream"); //topic=Demo
    if (!client.connected()) {
      reconnect();
    }
  }
}


void setup() {
  Serial.begin(1000000);
  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);
  WiFi.begin(ssid, password);
  Serial.println("connected");
  client.setServer(mqtt_server, 1883);//connecting to mqtt server
  client.setCallback(callback);
  //delay(5000);
  connectmqtt();
}


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

  client.loop();

  EVERY_N_SECONDS(10) {
    framerate = framerateCounter > 0 ? framerateCounter / 10 : 0;
    framerateCounter = 0;
    Serial.println("framerate");
    Serial.println(framerate);
  }

}

Isn't ESP32 supposed to be faster than ESP32?
Is it a problem in its WiFiClient ?

3

thanks for the reply @Idahowalker
what are the specific esp32 features that you suggest to use?

4

See the posted code.

5

@Idahowalker seen it but still not get the feature that should speed up the workflow I described.

6

Sorry for wasting your time.

7

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