- Fri Dec 05, 2014 10:20 pm
#4098
jpcleve wrote:i found this link http://www.snip2code.com/Snippet/194415/Webserver-for-Arduino-ESP8266 tonight, and with a little tweaking, wound up with the sketch below. I finally have a working http server demo! Pretty awesome little chip.
Code: Select all//Leonardo
//Serial_ & dbgTerminal = Serial;
//HardwareSerial & espSerial = Serial1;
////UNO & M328P
//#include <SoftwareSerial.h>
//SoftwareSerial dbgTerminal(10, 11); // RX, TX
//HardwareSerial & espSerial = Serial;
//
////MEGA2560
HardwareSerial & dbgTerminal = Serial;
HardwareSerial & espSerial = Serial1;
// set pin numbers:
const int ledPin = 13; // the number of the LED pin
const int ESP8266_CHPD = 4;
// Variables will change:
int ledState = HIGH; // ledState used to set the LED
#define BUFFER_SIZE 128
char buffer[BUFFER_SIZE];
void setup() {
pinMode(ledPin, OUTPUT);
//pinMode(ESP8266_CHPD, OUTPUT);
dbgTerminal.begin(115200); // Serial monitor
espSerial.begin(115200); // ESP8266
//while (!dbgTerminal) {
// ; // wait for serial port to connect. Needed for Leonardo only
//}
dbgTerminal.println(F("ESP8266 demo."));
//hardReset();
//delay(2000);
clearSerialBuffer();
//connect to router
connectWiFi("SSID", "PASSWORD");
//test if the module is ready
dbgTerminal.print("AT : ");
dbgTerminal.println( GetResponse("AT",1000) );
//Change to mode 1
dbgTerminal.print("AT+CWMODE=1 : ");
dbgTerminal.println( GetResponse("AT+CWMODE=1",1000) );
//set the multiple connection mode
dbgTerminal.print(F("AT+CIPMUX=1 : "));
dbgTerminal.println( GetResponse("AT+CIPMUX=1",1000) );
//set the server of port 80 check "no change" or "OK"
dbgTerminal.print(F("AT+CIPSERVER=1,8888 : "));
dbgTerminal.println( GetResponse("AT+CIPSERVER=1,8888", 1000) );
//set time out
dbgTerminal.print("AT+CIPSTO=15 : ");
dbgTerminal.println( GetResponse("AT+CIPSTO=15",1000) );
//print the ip addr
dbgTerminal.print(F("ip address : "));
dbgTerminal.println( GetResponse("AT+CIFSR", 1000) );
delay(200);
dbgTerminal.println();
dbgTerminal.println(F("Start Webserver"));
digitalWrite(ledPin,ledState);
}
void loop() {
int ch_id, packet_len;
char *pb;
espSerial.readBytesUntil('\n', buffer, BUFFER_SIZE);
if(strncmp(buffer, "+IPD,", 5)==0) {
// request: +IPD,ch,len:data
sscanf(buffer+5, "%d,%d", &ch_id, &packet_len);
if (packet_len > 0) {
// read serial until packet_len character received
// start from :
pb = buffer+5;
while(*pb!=':') pb++;
pb++;
if (strncmp(pb, "GET /led", 8) == 0) {
dbgTerminal.print(millis());
dbgTerminal.print(" : ");
dbgTerminal.println(buffer);
dbgTerminal.print( "get led from ch :" );
dbgTerminal.println(ch_id);
delay(100);
clearSerialBuffer();
if (ledState == LOW)
ledState = HIGH;
else
ledState = LOW;
digitalWrite(ledPin, ledState);
homepage(ch_id);
}
else if (strncmp(pb, "GET / ", 6) == 0) {
dbgTerminal.print(millis());
dbgTerminal.print(" : ");
dbgTerminal.println(buffer);
dbgTerminal.print( "get Status from ch:" );
dbgTerminal.println(ch_id);
delay(100);
clearSerialBuffer();
homepage(ch_id);
}
}
}
clearBuffer();
}
void homepage(int ch_id) {
String Header;
Header = "HTTP/1.1 200 OK\r\n";
Header += "Content-Type: text/html\r\n";
Header += "Connection: close\r\n";
//Header += "Refresh: 5\r\n";
String Content;
Content = "Hello World!";
Content += String(ledState);
Header += "Content-Length: ";
Header += (int)(Content.length());
Header += "\r\n\r\n";
espSerial.print("AT+CIPSEND=");
espSerial.print(ch_id);
espSerial.print(",");
espSerial.println(Header.length()+Content.length());
delay(10);
// for debug buffer serial error
//while (espSerial.available() >0 ) {
// char c = espSerial.read();
// dbgTerminal.write(c);
// if (c == '>') {
// espSerial.print(Header);
// espSerial.print(Content);
// }
//}
if (espSerial.find(">")) {
espSerial.print(Header);
espSerial.print(Content);
delay(10);
}
// Serial1.print("AT+CIPCLOSE=");
// Serial1.println(ch_id);
}
// Get the data from the WiFi module and send it to the debug serial port
String GetResponse(String AT_Command, int wait){
String tmpData;
espSerial.println(AT_Command);
delay(wait);
while (espSerial.available() >0 ) {
char c = espSerial.read();
tmpData += c;
if ( tmpData.indexOf(AT_Command) > -1 )
tmpData = "";
else
tmpData.trim();
}
return tmpData;
}
boolean hardReset() {
String tmpData;
digitalWrite(ESP8266_CHPD,LOW);
delay(100);
digitalWrite(ESP8266_CHPD,HIGH);
delay(1000);
while ( espSerial.available() > 0 ) {
char c = espSerial.read();
tmpData +=c;
espSerial.write(c);
if ( tmpData.indexOf("Ready") > -1 ) {
//Serial.println("Ready");
clearBuffer();
return 1;
}
}
}
void clearSerialBuffer(void) {
while ( espSerial.available() > 0 ) {
espSerial.read();
}
}
void clearBuffer(void) {
for (int i =0;i<BUFFER_SIZE;i++ ) {
buffer[i]=0;
}
}
boolean connectWiFi(String NetworkSSID,String NetworkPASS) {
String cmd = "AT+CWJAP=\"";
cmd += NetworkSSID;
cmd += "\",\"";
cmd += NetworkPASS;
cmd += "\"";
dbgTerminal.println(cmd);
dbgTerminal.println(GetResponse(cmd,8000));
}
Enjoy!
John
Hi John,
after a few trials and error I was finally able to make it work. Thank you, nice piece of software!
Instead of having a simple "Hello World", I have tried to go a bit further and enclosed it in the <HTML> and <BODY> tags, but I am getting a lot of "wrong syntax" errors in the debug window. Looks like the ESP8266 is trying to resend the text several times after the connection have been closed.
This is what I have modified in "homepage":
Content = "<html>\r\n<body>\r\n";
Content += "Hello World!\r\n";
Content += String(ledState);
Content += "\r\n</body>\r\n</html>\r\n";
apparently \r\n won't work, because I see the led status value after the "Hello World!" label, but the <br /> tag somewhat work, in the sense that I can see the two texts on separate lines but I am also getting error in the debug window.
Maybe the header has to be modified when adding HTML tags?
Sorry for the basic HTML question, but i am no expert in this field.
Nodduino
