ESP8266 Community Forum

- Sun Dec 23, 2018 4:15 pm #79691 Hello,

I have some performance issue with the below code.
In fact, the execution of client.readString() takes around 15s. It is placed in the read_response state of my finite state machine.

Is this long time a normal execution time? Or do I something wrong?

Many thanks in advance for help or tips which will solve this performance issue.

Thoma

Code: Select all#include <ArduinoJson.h>
#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>

WiFiClientSecure client;
const int port = 443;

char * ssid = "----";
char * password = "----";

const char* host = "myserver.tld";
String url = "/store.php";

char buffer[8193];

enum { open_connection, post_data, awaiting_response, read_response, close_connection} state;

unsigned long start;

void setup()
{
  for (int index = 0; index < 8192; index++)
  {
    buffer[index] = '0' + ((index + 1) % 10);
  }
  buffer[8192] = '\0';

  Serial.begin(115200);
 
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);
 
  Serial.print("Connecting Wifi: ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(500);
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  IPAddress ip = WiFi.localIP();
  Serial.println(ip);

  state = open_connection;
}

void loop()
{
  switch(state)
  {
    case open_connection :
      if (client.connect(host, port))
      {
        Serial.println("Connected...");
        start = millis();
        state = post_data;
      }
      break;
    case post_data :
      post(host, url, buffer);
      Serial.print("POST... (");
      Serial.print(millis() - start);
      Serial.println(" ms)");
      state = awaiting_response;
      break;
    case awaiting_response :
      if (client.available())
      {
        Serial.print("Response available... (");
        Serial.print(millis() - start);
        Serial.println(" ms)");
        state = read_response;
      }
      break;
    case read_response :
      Serial.print("Start reading... (");
      Serial.print(millis() - start);
      Serial.println(" ms)");
      client.readString();
      Serial.print("Complete reading... (");
      Serial.print(millis() - start);
      Serial.println(" ms)");
      if (!client.available())
      {
        Serial.print("Response read... (");
        Serial.print(millis() - start);
        Serial.println(" ms)");
        state = close_connection;
      }
      break;
    case close_connection :
      Serial.print("Operation tooks: ");
      Serial.print(millis() - start);
      Serial.println(" ms");
      client.stop();
      Serial.print("Closed... (");
      Serial.print(millis() - start);
      Serial.println(" ms)");
      Serial.println();
      state = open_connection;
      break;
    default :
      state = open_connection;
      break;
  }
}

void post(String _host, String _url, char * _data)
{
  client.println(String(F("POST ")) + _url + F(" HTTP/1.1"));
  client.println(String(F("Host: ")) + _host);
  client.println(F("User-Agent: ESP8266/1.0"));
  client.println(F("Connection: close"));
  client.println(F("Content-Type: application/json"));
  client.print(F("Content-Length: "));
  client.println(strlen((const char *)_data));
  client.println();
  client.println(_data);
}