ESP8266 TCP connection WiFiClient issue

Question

I am using ESP8266 01 board to send some data via TCP to server on local network. My code is:

#include <ESP8266WiFi.h>
const char* ssid = "ssid";
const char* password = "pas";
const char* host = "192.168.1.103";
void setup() {
 Serial.begin(115200);
 delay(10);
 // Wifi connection
 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());
 delay(5000);
 Serial.print("connecting to ");
 Serial.println(host);
 // Use WiFiClient class to create TCP connections
 WiFiClient client;
 const int port = 8888;
 if (!client.connect(host, port)) 
 {
 Serial.println("connection failed");
 return;
 }
}
void loop() {
 while(Serial.available() == 0)
 {
 //wait for arduino serial data
 }
 while(Serial.available())
 {
 // send data to server
 client.print(Serial.read());
 }
}

After chacking code in Arduino IDE I am getting error message:

In function 'void loop()':
espwifitcp1:57: error: 'client' was not declared in this scope
 client.print(Serial.read());
 ^
exit status 1
'client' was not declared in this scope

It appears that if I declare WiFiClient client; inside setup() function it can't be accessed outside it. Do I correctly understand the problem? I have tried to declare object outside setup() and loop() functions but it got even more errors. Any suggestions?

Answer 1

You have declared WiFiClient client; in the scope of setup() only. Move it's declaration to the global scope by placing it above the declaration of void setup()

• qräbnö: Or write WiFiClient instead of WifiClient X_X

Answer 2

in the header include WifiClient.h

• Juraj: ESP8266WiFi.h includes WiFiClient.h