Link error

[bbmachado]

Hi,

I´m working a project using ESP-8266 ESP-01, but when i try connect do a server return Link Error. When I use the AT Commands direct by serial terminal it´s work fine. Any ideias?

The code:

#include <ESP8266wifi.h>
#include <SoftwareSerial.h>

#define SSID "My network"
#define PASSWORD "xxxxxxxxxx"
#define sw_serial_rx_pin 3 // Connect this pin to TX on the esp8266
#define sw_serial_tx_pin 2 // Connect this pin to RX on the esp8266
#define esp8266_reset_pin 8 // Connect this pin to CH_PD on the esp8266, not reset. (let reset be unconnected)

uint8_t wifi_started = false;
SoftwareSerial swSerial(sw_serial_rx_pin, sw_serial_tx_pin);
// the last parameter sets the local echo option for the ESP8266 module..
ESP8266wifi wifi(swSerial, swSerial, esp8266_reset_pin,Serial);

void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
swSerial.begin(115200);
Serial.println("Starting wifi...");

wifi.begin();
//wifi.setTransportToTCP();
wifi.connectToAP(SSID, PASSWORD);
if (wifi.isStarted()) Serial.println("Just Testing....");
condicaotempo();
}

void condicaotempo() {
String location = "/"; // Location where to fetch the new Status
String cmd = "GET / HTTP/1.1\r\n"; // complete HTTP request
//cmd += "Host: www.google.com.br\n";

wifi.connectToServer("www.google.com.br", "80");
delay(1000);
wifi.send(SERVER, cmd);

WifiMessage in = wifi.listenForIncomingMessage(2000);
if (in.hasData)
{
Serial.print("Response: ");
Serial.println(in.message);
} else {
Serial.println("I can´t connect to server :-(");
}
wifi.disconnectFromServer();
}

void loop() {
// put your main code here, to run repeatedly:

}

Thanks for helping

[DanielV]

Hi, there

Did you try to set first the command AT+CIPMUX=1 before setting the connectToServer(), you could try something like this : swSerial.write("AT+CIPMUX=1\r\n")

[bbmachado]

Hi Fox51,

I used this command, but in the begining of the program. I will try again, but before the command connectToServer().

Thanks