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Saturday, August 6, 2016

ESP 05 ESP8266 Arduino Mega act as simple web server

Last post introduced ESP-05 (a mini ESP8266 board) with simple testing. This post show a very simple web server on Arduino Mega 2560 + ESP-05.

Basically, its same as the example of "Arduino + ESP8266 - Web Server (III) with firmware 00200.9.5(b1)", except the baud rate.

Mega_ESP05_Web.ino
/*
Arduino Mega 2560 + ESP-05(ESP8266)

ESP-05 running firmware:
AT version:0.40.0.0(Aug 8 2015 14:45:58)
SDK version:1.3.0
Ai-Thinker Technology Co.,Ltd.
Build:1.3.0.2 Sep 11 2015 11:48:04

Connection between Mega & ESP-05, 
refer "Connect with Arduino Mega 2560 via Level Converter" in:
http://goo.gl/wtG89i

Mega + ESP_05 act as station, join WiFi AP of my phone.
Once server setup, you can visit the webpage in ESP-05
by visit the IP show in Serial Monitor, under the command:
AT+CIFSR
+CIFSR:STAIP,"192.168.43.15"

If always show "Module have no response.",
check your connection, or reset ESP-05 by power OFF and ON.

 */
#define ASCII_0 48
#define ESP8266 Serial3

//WiFi hotspot setting on my phone
String SSID = "ssid";
String PASSWORD = "password";

int LED = 13;

boolean FAIL_8266 = false;

String strHTML1 = "<!doctype html>
<html>
<head>
<title>arduino-er</title>
</head>
<body>
<H1>arduino-er.blogspot.com</H1>";

String strHTML2 = "</body>
</html>";

//String strHTML = "arduino-er.blogspot.com";

#define BUFFER_SIZE 128
char buffer[BUFFER_SIZE];

void setup() {
 pinMode(LED, OUTPUT);
 
 digitalWrite(LED, LOW);
 delay(300);
 digitalWrite(LED, HIGH);
 delay(200);
 digitalWrite(LED, LOW);
 delay(300);
 digitalWrite(LED, HIGH);
 delay(200);
 digitalWrite(LED, LOW);

 do{
 Serial.begin(115200);
 ESP8266.begin(115200);
 
 //Wait Serial Monitor to start
 while(!Serial);
 Serial.println("--- Start ---");

 ESP8266.println("AT+RST");
 delay(1000);
 if(ESP8266.find("ready"))
 {
 Serial.println("Module is ready");
 
 ESP8266.println("AT+GMR");
 delay(1000);
 clearESP8266SerialBuffer();
 
 ESP8266.println("AT+CWMODE=1");
 delay(2000);
 
 //Quit existing AP, for demo
 Serial.println("Quit AP");
 ESP8266.println("AT+CWQAP");
 delay(1000);
 
 clearESP8266SerialBuffer();
 if(cwJoinAP())
 {
 Serial.println("CWJAP Success");
 FAIL_8266 = false;
 
 delay(3000);
 clearESP8266SerialBuffer();
 //Get and display my IP
 sendESP8266Cmdln("AT+CIFSR", 1000); 
 //Set multi connections
 sendESP8266Cmdln("AT+CIPMUX=1", 1000);
 //Setup web server on port 80
 sendESP8266Cmdln("AT+CIPSERVER=1,80",1000);
 
 Serial.println("Server setup finish");
 }else{
 Serial.println("CWJAP Fail");
 delay(500);
 FAIL_8266 = true;
 }
 }else{
 Serial.println("Module have no response.");
 delay(500);
 FAIL_8266 = true;
 }
 }while(FAIL_8266);
 
 digitalWrite(LED, HIGH);
 
 //set timeout duration ESP8266.readBytesUntil
 ESP8266.setTimeout(1000);
}

void loop(){
 int connectionId;
 
 if(ESP8266.readBytesUntil( , buffer, BUFFER_SIZE)>0)
 {
 Serial.println("Something received");
 Serial.println(buffer);
 if(strncmp(buffer, "+IPD,", 5)==0){
 Serial.println("+IPD, found");
 sscanf(buffer+5, "%d", &connectionId);
 Serial.println("connectionId: " + String(connectionId));
 delay(1000);
 clearESP8266SerialBuffer();
 
 sendHTTPResponse(connectionId, strHTML1);
 sendHTTPResponse(connectionId, "<hr/>-END-<br/>");
 sendHTTPResponse(connectionId, strHTML2);

 //Close TCP/UDP
 String cmdCIPCLOSE = "AT+CIPCLOSE="; 
 cmdCIPCLOSE += connectionId;
 sendESP8266Cmdln(cmdCIPCLOSE, 1000);
 }
 }
}

void sendHTTPResponse(int id, String response)
{
 String cmd = "AT+CIPSEND=";
 cmd += id;
 cmd += ",";
 cmd += response.length();
 
 Serial.println("--- AT+CIPSEND ---");
 sendESP8266Cmdln(cmd, 1000);
 
 Serial.println("--- data ---");
 sendESP8266Data(response, 1000);
}

boolean waitOKfromESP8266(int timeout)
{
 do{
 Serial.println("wait OK...");
 delay(1000);
 if(ESP8266.find("OK"))
 {
 return true;
 }

 }while((timeout--)>0);
 return false;
}

boolean cwJoinAP()
{
 String cmd="AT+CWJAP="" + SSID + "","" + PASSWORD + """;
 ESP8266.println(cmd);
 return waitOKfromESP8266(10);
}

//Send command to ESP8266, assume OK, no error check
//wait some time and display respond
void sendESP8266Cmdln(String cmd, int waitTime)
{
 ESP8266.println(cmd);
 delay(waitTime);
 clearESP8266SerialBuffer();
}

//Basically same as sendESP8266Cmdln()
//But call ESP8266.print() instead of call ESP8266.println()
void sendESP8266Data(String data, int waitTime)
{
 //ESP8266.print(data);
 ESP8266.print(data);
 delay(waitTime);
 clearESP8266SerialBuffer();
}

//Clear and display Serial Buffer for ESP8266
void clearESP8266SerialBuffer()
{
 Serial.println("= clearESP8266SerialBuffer() =");
 while (ESP8266.available() > 0) {
 char a = ESP8266.read();
 Serial.write(a);
 }
 Serial.println("==============================");
}
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