tcp/tcp_client/tcp_client.ino

/*
 *  This sketch sends data via HTTP GET requests to data.sparkfun.com service.
 *
 *  You need to get streamId and privateKey at data.sparkfun.com and paste them
 *  below. Or just customize this script to talk to other HTTP servers.
 *
 */

#include <WiFi.h>

const char* ssid     = "yourssid";
const char* password = "12345678";
const char* host = "192.168.4.1";
WiFiClient client;
uint16_t port = 9100;
uint8_t temp;
uint8_t buffer[512];
void setup()
{
    Serial.begin(921600);
    delay(10);
    // We start by connecting to a WiFi network
    Serial.println();
    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 loop()
{
    // Use WiFiClient class to create TCP connections
    if (client.connected()) {
    while (client.available() != 0) {
        if (client.available()<=512)
        {
            int cnt = client.available();
            client.read(buffer,cnt);
            Serial.write(buffer,cnt);
        }else{
            client.read(buffer,512);
            Serial.write(buffer,512);
        }
    }
    }else{
      Serial.println("connecting to ");
      Serial.printf("%s %d\n",host,port);
      client.connect(host, port);
      delay(500);
    }
}