Example code is not working

[Rakesh420]

Arduino: 1.8.10 (Windows 10), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Disabled, All SSL ciphers (most compatible), 4M (no SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 115200"

tello_example:63:16: error: variable or field 'WiFiEvent' declared void

void WiFiEvent(WiFiEvent_t event)

            ^

tello_example:63:16: error: 'WiFiEvent_t' was not declared in this scope

F:\telloArduino-master\tello_example\tello_example.ino: In function 'void connectToWiFi(const char*, const char*)':

tello_example:52:23: error: no matching function for call to 'WiFiClass::disconnect(bool)'

WiFi.disconnect(true);

                   ^

F:\telloArduino-master\tello_example\tello_example.ino:52:23: note: candidate is:

In file included from C:\Users\R\Documents\Arduino\libraries\tello/Tello.h:12:0,

             from F:\telloArduino-master\tello_example\tello_example.ino:1:

C:\Program Files (x86)\Arduino\libraries\WiFi\src/WiFi.h:130:9: note: int WiFiClass::disconnect()

 int disconnect(void);

     ^

C:\Program Files (x86)\Arduino\libraries\WiFi\src/WiFi.h:130:9: note: candidate expects 0 arguments, 1 provided

tello_example:54:8: error: 'class WiFiClass' has no member named 'onEvent'

WiFi.onEvent(WiFiEvent);

    ^

tello_example:54:16: error: 'WiFiEvent' was not declared in this scope

WiFi.onEvent(WiFiEvent);

            ^

tello_example:57:23: error: invalid conversion from 'const char*' to 'char*' [-fpermissive]

WiFi.begin(ssid, pwd);

                   ^

In file included from C:\Users\R\Documents\Arduino\libraries\tello/Tello.h:12:0,

             from F:\telloArduino-master\tello_example\tello_example.ino:1:

C:\Program Files (x86)\Arduino\libraries\WiFi\src/WiFi.h:79:9: error: initializing argument 1 of 'int WiFiClass::begin(char*, const char*)' [-fpermissive]

 int begin(char* ssid, const char *passphrase);

     ^

F:\telloArduino-master\tello_example\tello_example.ino: At global scope:

tello_example:63:16: error: variable or field 'WiFiEvent' declared void

void WiFiEvent(WiFiEvent_t event)

            ^

tello_example:63:16: error: 'WiFiEvent_t' was not declared in this scope

Multiple libraries were found for "SPI.h"
Used: C:\Users\R
Multiple libraries were found for "Tello.h"
Used: C:\Users\R
Not used: C:\Users\R
Multiple libraries were found for "WiFi.h"
Used: C:\Program
Multiple libraries were found for "ESP8266WiFi.h"
Used: C:\Users\R
exit status 1
variable or field 'WiFiEvent' declared void

This report would have more information with
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option enabled in File -> Preferences.

[savasturk]

Did you solve this problem?

[akshayvernekar]

HI I just tested the code on Windows PC with Arduino 1.8.13 and it compiles just fine. Please make sure you are using the latest stable version of Arduino

[DEAD-GOST]

I am using, Arduino version 1.8.13, but it still showing same error

`#include <Tello.h>

// WiFi network name and password:
const char * networkName = "TELLO-XXXXXX";//Replace with your Tello SSID
const char * networkPswd = "";

//Are we currently connected?
boolean connected = false;

Tello tello;

void setup()
{
Serial.begin(9600);
//Connect to the WiFi network
connectToWiFi(networkName, networkPswd);
}

void loop()
{
// put your main code here, to run repeatedly:
if(connected )
{
tello.takeoff();
delay(5000);
tello.up(30);
delay(2000);
tello.down(30);
delay(2000);
tello.right(30);
delay(2000);
tello.left(30);
delay(2000);
tello.land();
//you have 5 seconds to save your tello before it takes off again
delay(5000);

//do once and go into a while loop
while(1)
{
  delay(5000);
}

}
}

void connectToWiFi(const char * ssid, const char * pwd)
{
Serial.println("Connecting to WiFi network: " + String(ssid));

// delete old config
WiFi.disconnect(true);
//register event handler
WiFi.onEvent(WiFiEvent);

//Initiate connection
WiFi.begin(ssid, pwd);

Serial.println("Waiting for WIFI connection...");
}

//wifi event handler
void WiFiEvent(WiFiEvent_t event)
{
switch (event)
{
case SYSTEM_EVENT_STA_GOT_IP:
//When connected set
Serial.print("WiFi connected! IP address: ");
Serial.println(WiFi.localIP());
//initialise Tello after we are connected
tello.init();
connected = true;
break;

case SYSTEM_EVENT_STA_DISCONNECTED:
  Serial.println("WiFi lost connection");
  connected = false;
  break;

}
}
`