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Arduino WiFi library for ESP8266 modules

License: GNU General Public License v3.0

C++ 100.00%

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wifiesp's Issues

UDP Server does not work

The attached sketch, based on an official WiFi shield tutorial (https://www.arduino.cc/en/Tutorial/WiFiSendReceiveUDPString - with obvious modifications) is supposed to setup a UDP server socket which will listen for packets.

Although, it seems that the socket is not actually started and the sketch will never receive anything.

WiFiUDPServerExample.zip

Older ESP-01 Firmware Support

I see that most ESP-01 modules come with v.0.9.2 loaded. I noticed that WifiEsp rejects that. Any reason you need a higher version? Are there some features that depend on it?

I tried flashing to no avail using every tutorial on the entire web, including and especially this one: http://yaab-arduino.blogspot.it/2015/12/flashing-esp8266-firmware-arduino.html.

My ESP-01 devices refuse to work with v1.x. I can flash them with NodeMCU and it works fine, so I know my hardware and wiring for programming are good.

I also read through this post #9, but my issue is different, in that flashing succeeds, no errors, but the device will NOT respond to AT commands (acts as though it's dead or without firmware). Any tips are appreciated. But in the meantime, if WifiESP didn't have this requirement, that would also be helpful. I've looked at about 10 other wifi libraries and WifiESP is the only one that actually has activity and changes more recently than a full year ago.

Buffer overflow in UDP.read()

In the official Ethernet library's UDP.read(unsigned char* buffer, size_t len), len is the buffer size, so care should be taken not to write more than len bytes to buffer.

This does not happen in WifiEsp, where the len parameter is basically ignored and the buffer is overflowed if more bytes are received than can fit into the buffer.

See: https://www.arduino.cc/en/Reference/EthernetUDPRead

Compiling Errors

I am receiving the following errors while using your code.

This is the webserver example code. I'm using Arduino IDE 1.6.5

This is the code, i've added in my ssid and pass and some other stuff to work with my 8266...

`/*
WiFiEsp example: WebServer

A simple web server that shows the value of the analog input
pins via a web page using an ESP8266 module.
This sketch will print the IP address of your ESP8266 module (once connected)
to the Serial monitor. From there, you can open that address in a web browser
to display the web page.
The web page will be automatically refreshed each 20 seconds.

For more details see: http://yaab-arduino.blogspot.com/p/wifiesp.html
*/

include <PLDuino.h>

include "WiFiEsp.h"

// Emulate Serial1 on pins 6/7 if not present

ifndef HAVE_HWSERIAL1

include "SoftwareSerial.h"

SoftwareSerial Serial1(14, 15); // RX, TX

endif

char ssid[] = "Linksys2"; // your network SSID (name)
char pass[] = "6046146090"; // your network password
int status = WL_IDLE_STATUS; // the Wifi radio's status
int reqCount = 0; // number of requests received

WiFiEspServer server(80);

void setup()
{
using namespace PLDuino;

PLDuino::init();
enableESP();
// initialize serial for debugging
Serial.begin(9600);
// initialize serial for ESP module
Serial1.begin(115200);
// initialize ESP module
WiFi.init(&Serial1);

// check for the presence of the shield
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue
while (true);
}

// attempt to connect to WiFi network
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network
status = WiFi.begin(ssid, pass);
}

Serial.println("You're connected to the network");
printWifiStatus();

// start the web server on port 80
server.begin();
}

void loop()
{
// listen for incoming clients
WiFiEspClient client = server.available();
if (client) {
Serial.println("New client");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank) {
Serial.println("Sending response");

      // send a standard http response header
      // use \r\n instead of many println statements to speedup data send
      client.print(
        "HTTP/1.1 200 OK\r\n"
        "Content-Type: text/html\r\n"
        "Connection: close\r\n"  // the connection will be closed after completion of the response
        "Refresh: 20\r\n"        // refresh the page automatically every 20 sec
        "\r\n");
      client.print("<!DOCTYPE HTML>\r\n");
      client.print("<html>\r\n");
      client.print("<h1>Hello World!</h1>\r\n");
      client.print("Requests received: ");
      client.print(++reqCount);
      client.print("<br>\r\n");
      client.print("Analog input A0: ");
      client.print(analogRead(0));
      client.print("<br>\r\n");
      client.print("</html>\r\n");
      break;
    }
    if (c == '\n') {
      // you're starting a new line
      currentLineIsBlank = true;
    }
    else if (c != '\r') {
      // you've gotten a character on the current line
      currentLineIsBlank = false;
    }
  }
}
// give the web browser time to receive the data
delay(10);

// close the connection:
client.stop();
Serial.println("Client disconnected");

}
}

void printWifiStatus()
{
// print the SSID of the network you're attached to
Serial.print("SSID: ");
Serial.println(WiFi.SSID());

// print your WiFi shield's IP address
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);

// print where to go in the browser
Serial.println();
Serial.print("To see this page in action, open a browser to http://");
Serial.println(ip);
Serial.println();
}`

I get the following error.

Arduino: 1.6.5 (Windows 7), Board: "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"

WebServer.ino: In function 'void setup()':
WebServer:64: error: 'printWifiStatus' was not declared in this scope
'printWifiStatus' was not declared in this scope

`
Even though it is in the code. So i then comment it out and get a compiling error...

Arduino: 1.6.5 (Windows 7), Board: "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"

\GAS1\RedirectedFolders\AndrewC\My Documents\Arduino\libraries\WiFiEsp-master\src\utility\EspDrv.cpp: In static member function 'static bool EspDrv::getNetmask(IPAddress&)':
\GAS1\RedirectedFolders\AndrewC\My Documents\Arduino\libraries\WiFiEsp-master\src\utility\EspDrv.cpp:516:8: error: 'class IPAddress' has no member named 'fromString'
mask.fromString (buf);
^
\GAS1\RedirectedFolders\AndrewC\My Documents\Arduino\libraries\WiFiEsp-master\src\utility\EspDrv.cpp: In static member function 'static bool EspDrv::getGateway(IPAddress&)':
\GAS1\RedirectedFolders\AndrewC\My Documents\Arduino\libraries\WiFiEsp-master\src\utility\EspDrv.cpp:530:6: error: 'class IPAddress' has no member named 'fromString'
gw.fromString (buf);
^
Error compiling.

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.

Any ideas?

Buffer overflow with ESP8266 firmware 0.60

I am using this library with an ESP-12E with firmware 0.60, recently released. This replies to AT+GMR with a firmware version of 1.5.2(80914727), which is longer than the library expects, leading to memory corruption.

The solution is to set in EspDrv.h:
#define WL_FW_VER_LENGTH 16

Memory usage is high

I wonder what is using over 540 bytes of precious Global Variable space.
A basic program gives me the following ...

            code size   Global Vars
+WiFiEsp        4854        357
+init           7114        905 (548 bytes more)

The basic program

#include "WiFiEsp.h"

// Emulate Serial1 on pins 2/3 if not present
#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
//#define _SS_MAX_RX_BUFF 256 // RX buffer size //BEFORE WAS 64
SoftwareSerial Serial1(2, 3); // RX, TX
#endif


void setup() {
    Serial.begin(9600);
    Serial1.begin(9600);
//  WiFi.init(&Serial1);

// check for the presence of the shield:
//  if (WiFi.status() == WL_NO_SHIELD) {
//    Serial.println("WiFi shield not present");
//   don't continue:
//   while (true);
//  }
  }

void loop() {

}

Bad constant in EspDrv::getScanNetworks

is: if(ssidListNum==WL_SSID_MAX_LENGTH-1) break;
to be: if(ssidListNum==WL_NETWORKS_LIST_MAXNUM-1) break;

or
comment if(ssidListNum==WL_SSID_MAX_LENGTH-1) break;
and change
while (idx == NUMESPTAGS)
to
while ((idx == NUMESPTAGS) && (ssidListNum < WL_NETWORKS_LIST_MAXNUM))

Large Mutli-block GET requests

Thanks for making this work previously.
I have provided code to demonstrate the next little quirk.
You should be able to run this with only your AP change needed.
The GET returns 4 blocks 3 are the full TCP packet and the last on is a partial packet.
When I do this manually via AT commands the 4 blocks come back one after the one with no delays.
When i do this via the arduino code below, there is often a 2 to 10 second break between the 2nd and 3rd blocks. i cant figure out why.

Any ideas?

/*
 WiFiEsp example: WebClient



 Circuit: http://yaab-arduino.blogspot.com/2015/03/esp8266-wiring-schemas.html
*/

#include "WiFiEsp.h"

// Emulate Serial1 on pins 2/3 if not present
#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
//#define _SS_MAX_RX_BUFF 256 // RX buffer size //BEFORE WAS 64
SoftwareSerial esp8266(2, 3); // RX, TX
#endif



  int result;
  int InvertCount;
  int k;
  char c;
  int totalW =0;
  float tempA =0;
  float ACVoltsA =0;
  float DailyWatts= -1.0;
char dstr1[9] ;
char dstr2[9] ;
char lasttime[9] ;



char ssid[] = "nilfilum";            // your network SSID (name)
char pass[] = "";        // your network password
int status = WL_IDLE_STATUS;     // the Wifi radio's status

char server[] = "mancave.space";
byte serverPORT = 80;

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
WiFiEspClient client;

void setup() {
  // initialize serial and wait for port to open:
  Serial.begin(9600);
//  Serial.begin(115200);
  while (!Serial); // wait for serial port to connect. Needed for Leonardo only

  esp8266.begin(9600);
  // initialize ESP module
  WiFi.init(&esp8266);
//  WiFi.init(9600);  // initialize ESP serial port with default baud rate 9600

  // check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // don't continue:
    while (true);
  }

  // attempt to connect to Wifi network:
  while (status != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
    status = WiFi.begin(ssid, pass);

  }
  Serial.println("Connected to wifi");
  printWifiStatus();

  Serial.println("\nStarting connection to server...");
  // if you get a connection, report back via serial:
  if (client.connect(server, serverPORT)) {
    Serial.println("connected to server");
    // Make a HTTP request:
    client.println("GET /parameters.php HTTP/1.1");
    client.print("Host: "); client.println(server);
//    client.println("Connection: keep-alive");
    client.println("Connection: close");
    client.println();
  }


InvertCount=0; totalW=0;tempA=0;ACVoltsA=0;

}




void loop() {
 ECURealTimeData_RAW_CRLF();


  // if there are incoming bytes available
  // from the server, read them and print them:
//  while (client.available()) {    char c = client.read();    Serial.write(c);  }




  // if the server's disconnected, stop the client:
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting from server.");
    client.stop();


    Terminal(); // nice way to finish

  }
}


void ECURealTimeData_RAW_CRLF()
{ 
  char c;
  char b;
  char a;
  char d;
while (client.available()) 
      { 
       a=b;
       b=c;
       c=d;
       d = client.read();    
       Serial.write(d);  
       if ((a =='/')&& (b =='t') && (c == 'r')&& (d == '>') ) Serial.println();
      }

}


void printWifiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}


void Terminal()
{
  Serial.println("Terminal Mode Forever");

 while(1)
{ 
  if(esp8266.available())  // check if the ESP is sending a message
  {
    while(esp8266.available())
    {
      char c = esp8266.read();  // read the next character.
      Serial.write(c);  // writes data to the serial monitor
    }
  }

  if(Serial.available())
  {
    delay(10);  // wait to let all the input command in the serial buffer

    // read the input command in a string
    String cmd = "";
    while(Serial.available())
    {
      cmd += (char)Serial.read();
    }

    // print the command and send it to the ESP
    Serial.println("---------------------");
    Serial.print(">> ");
    Serial.println(cmd);
    Serial.println("---------------------");
    esp8266.println(cmd); // send the read character to the esp8266
  }
}
}

try webclient example , got that error .

C:\Users\wchen\Documents\Arduino\libraries\WiFiEsp\src\utility\EspDrv.cpp: In static member function 'static bool EspDrv::getNetmask(IPAddress&)':
C:\Users\wchen\Documents\Arduino\libraries\WiFiEsp\src\utility\EspDrv.cpp:503:10: error: 'class IPAddress' has no member named 'fromString'
mask.fromString (buf);
^
C:\Users\wchen\Documents\Arduino\libraries\WiFiEsp\src\utility\EspDrv.cpp: In static member function 'static bool EspDrv::getGateway(IPAddress&)':
C:\Users\wchen\Documents\Arduino\libraries\WiFiEsp\src\utility\EspDrv.cpp:516:8: error: 'class IPAddress' has no member named 'fromString'
gw.fromString (buf);
^
Error compiling.

Changing mode 1 to 2

Hello, I am able to connect as a user to a router and as a SoftAP independently, however i can not change the mode in the middle of the program. I need to know how to got from a AP to a normal user. other sample using AT commands works fine but it is better to learn how to use this library.
Can you run both at the same time like in AT mode 3?
if you need more clarifications please let me know.
Also i wonder why the parameters for connection wifi.begin ssid and pass are Char array. it is harder to manipulate, do substring search etc in Arrays than in Strings type.
Thanks in advance.

ESP hangs on Timeout

At first here is the buggy code block -

` WiFiEspClient client = myserver.available();
if (client)
{Serial.println("Incoming connection...");
String readString = "";
char c;

 boolean currentLineIsBlank = true;

while(client.connected() )//&& millis()>(clienttimerecall+5000))
{if(client.available()){
c=client.read();
readString+=c;

if ((c == '\n' && currentLineIsBlank)){

k = statefinder(readString); ////////THIS BLOCK IS ENTIRELY WORK BASED
String printz=""; //////// AND DOES NOT USE ANY ESP BASED
worker(k,readString); //////// FUNCTIONS OR CALLS!
printz= clientprinter(k); ///////

Serial.print(" What came is this = ");
Serial.println(readString);
Serial.print("What I sent is this = ");
Serial.println(printz);

client.print("HTTP/1.1 200 OK\r\n");
client.print("\r\n");
client.print(printz);
client.print("\r\n");
break;}
if (c == '\n') { currentLineIsBlank = true;
}
else if (c != '\r') {
currentLineIsBlank = false;}

}}delay(10);
client.stop();
Serial.println("Client disconnected");
`

Now the problem starts when i actually use the server,it works fine for some times but later esp hangs & thts how it goes-

`[WiFiEsp] New client 0
Incoming connection...
THE TEMPERATURE CHECKER SAYS = 33
Registered Time is = 0
Millis Time is = 57579
Start Time is = 0
What came is this = GET /LIGHT HTTP/1.1
Host: 192.168.0.49
Connection: Keep-Alive
User-Agent: Apache-HttpClient/UNAVAILABLE (java 1.4)

What I sent is this = light

sendData: 0 17

Recv 17 bytes

SEND OK

sendData: 0 2

Recv 2 bytes

SEND OK

sendData: 0 5

Recv 5 bytes

SEND OK

sendData: 0 2

Recv 2 bytes

SEND OK
[WiFiEsp] Disconnecting 0

stopClient 0

AT+CIPCLOSE=0
0,CLOSED

OK
---------------------------------------------- > 0

Client disconnected

Data packet 0 121
[WiFiEsp] New client 0
Incoming connection...
[WiFiEsp] TIMEOUT: 102

getClientState 0

AT+CIPSTATUS
STATUS:3
+CIPSTATUS:0,"TCP","192.168.0.105",41324,1