ESP8266 motor shield 2

// include libraries
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
// configure server
ESP8266WebServer server(80);
const char *form = "<center><form action='/'>"
"<button name='dir' type='submit' value='4'>Forward</button><br>"
"<button name='dir' type='submit' value='1'>Left</button> "
"<button name='dir' type='submit' value='2'>Right</button><br>"
"<button name='dir' type='submit' value='3'>Reverse</button><p>"
"<button name='dir' type='submit' value='5'>Stop</button>"
"</form></center>";
void stop(void)
{
analogWrite(5, 0);
analogWrite(4, 0);
}
void forward(void)
{
analogWrite(5, 1023);
analogWrite(4, 1023);
digitalWrite(0, HIGH);
digitalWrite(2, HIGH);
}
void backward(void)
{
analogWrite(5, 1023);
analogWrite(4, 1023);
digitalWrite(0, LOW);
digitalWrite(2, LOW);
}
void left(void)
{
analogWrite(5, 1023);
analogWrite(4, 1023);
digitalWrite(0, LOW);
digitalWrite(2, HIGH);
}
void right(void)
{
analogWrite(5, 1023);
analogWrite(4, 1023);
digitalWrite(0, HIGH);
digitalWrite(2, LOW);
}
void handle_form()
{
// only move if we submitted the form
if (server.arg("dir"))
{
// get the value of request argument "dir"
int direction = server.arg("dir").toInt();
// chose direction
switch (direction)
{
case 1:
left();
break;
case 2:
right();
break;
case 3:
backward();
break;
case 4:
forward();
break;
case 5:
stop();
break;
}
// move for 300ms, gives chip time to update wifi also
delay(300);
}

// in all cases send the response
server.send(200, "text/html", form);
}
void setup()
{
// connect to wifi network
WiFi.begin("essid", "passphrase");
// static ip, gateway, netmask
WiFi.config(IPAddress(192,168,1,2), IPAddress(192,168,1,1), IPAddress(255,255,255,0));
// connect
while (WiFi.status() != WL_CONNECTED)
{
delay(200);
}

// set up the callback for http server
server.on("/", handle_form);
// start the webserver
server.begin();
pinMode(5, OUTPUT); // 1,2EN aka D1 pwm left
pinMode(4, OUTPUT); // 3,4EN aka D2 pwm right
pinMode(0, OUTPUT); // 1A,2A aka D3
pinMode(2, OUTPUT); // 3A,4A aka D4
}
void loop()
{
// check for client connections
server.handleClient();
}