return variant.is<const char *>() && variant.asString() == NULL;

[MrNitishroy]

C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseObject.cpp: In member function 'bool FirebaseObject::isNullString(const String&) const':
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseObject.cpp:71:57: warning: 'const char* ArduinoJson::Internals::JsonVariantCasts::asString() const [with TImpl = ArduinoJson::JsonVariant]' is deprecated: use as<char*>() instead [-Wdeprecated-declarations]
71 | return variant.is<const char >() && variant.asString() == NULL;
| ^
In file included from c:\users\nitis\onedrive\documents\arduino\libraries\arduinojson\src\arduinojson\JsonVariantBase.hpp:7,
from c:\users\nitis\onedrive\documents\arduino\libraries\arduinojson\src\arduinojson\JsonVariant.hpp:13,
from c:\users\nitis\onedrive\documents\arduino\libraries\arduinojson\src\arduinojson\jsonbuffer.hpp:12,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/Deserialization/JsonParser.hpp:7,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/JsonBufferBase.hpp:7,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/DynamicJsonBuffer.hpp:7,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson.hpp:9,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson.h:9,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseObject.h:24,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseObject.cpp:17:
c:\users\nitis\onedrive\documents\arduino\libraries\arduinojson\src\arduinojson\JsonVariantCasts.hpp:28:28: note: declared here
28 | FORCE_INLINE const char asString() const {
| ^~~~~~~~
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseObject.cpp: In member function 'ArduinoJson::JsonVariant FirebaseObject::getJsonVariant(const String&) const':
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseObject.cpp:91:26: warning: 'ArduinoJson::JsonObject& ArduinoJson::Internals::JsonVariantCasts::asObject() const [with TImpl = ArduinoJson::JsonVariant]' is deprecated: use as() instead [-Wdeprecated-declarations]
91 | json = json.asObject().get(start);
| ^
In file included from c:\users\nitis\onedrive\documents\arduino\libraries\arduinojson\src\arduinojson\JsonVariantBase.hpp:7,
from c:\users\nitis\onedrive\documents\arduino\libraries\arduinojson\src\arduinojson\JsonVariant.hpp:13,
from c:\users\nitis\onedrive\documents\arduino\libraries\arduinojson\src\arduinojson\jsonbuffer.hpp:12,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/Deserialization/JsonParser.hpp:7,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/JsonBufferBase.hpp:7,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/DynamicJsonBuffer.hpp:7,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson.hpp:9,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson.h:9,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseObject.h:24,
from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseObject.cpp:17:
c:\users\nitis\onedrive\documents\arduino\libraries\arduinojson\src\arduinojson\JsonVariantCasts.hpp:23:28: note: declared here
23 | FORCE_INLINE JsonObject &asObject() const {
| ^~~~~~~~
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\throw_out_of_range.cpp: In function 'void std::__throw_out_of_range(const char)':
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\throw_out_of_range.cpp:6:61: warning: unused parameter 'str' [-Wunused-parameter]
6 | void attribute((weak)) __throw_out_of_range(const char str) {
| ~~~~~~~~~~~~^~~
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'String FirebaseArduino::push(const String&, const ArduinoJson::JsonVariant&)':
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:65:54: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
65 | int status = req_.get()->sendRequest(host_, auth_, "POST", path.c_str(), buf);
| ^~~~~~
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:65:7: warning: unused variable 'status' [-Wunused-variable]
65 | int status = req_.get()->sendRequest(host_, auth_, "POST", path.c_str(), buf);
| ^~~~~~
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'void FirebaseArduino::set(const String&, const ArduinoJson::JsonVariant&)':
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:94:41: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
94 | req_.get()->sendRequest(host_, auth_, "PUT", path.c_str(), buf);
| ^~~~~
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'void FirebaseArduino::getRequest(const String&)':
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:101:41: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
101 | req_.get()->sendRequest(host_, auth_, "GET", path.c_str());
| ^~~~~
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'virtual void FirebaseArduino::remove(const String&)':
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:147:41: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
147 | req_.get()->sendRequest(host_, auth_, "DELETE", path.c_str());
| ^~~~~~~~
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'virtual const String& FirebaseArduino::error()':
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:201:32: warning: returning reference to temporary [-Wreturn-local-addr]
201 | return error_.message().c_str();
| ~~~~~~~~~~~~~~~~~~~~~~^~
In file included from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseCloudMessaging.cpp:1:
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseCloudMessaging.h:82:3: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
82 | const void AddToJson(const FirebaseCloudMessage& message, JsonObject& json) const;
| ^~~~~
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\Firebase.cpp: In member function 'int FirebaseRequest::sendRequest(const string&, const string&, char*, const string&, const string&)':
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\Firebase.cpp:78:1: warning: no return statement in function returning non-void [-Wreturn-type]
78 | }
| ^
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\Firebase.cpp: In member function 'void FirebaseStream::startStreaming(const string&, const string&, const string&)':
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\Firebase.cpp:91:16: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
91 | analyzeError("STREAM", status, path_with_auth);
| ^~~~~~~~
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseCloudMessaging.cpp:79:1: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
79 | const void FirebaseCloudMessaging::AddToJson(
| ^~~~~
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp: In member function 'virtual void FirebaseHttpClientEsp8266::begin(const string&)':
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:47:50: error: no matching function for call to 'begin(const char*, const char [60])'
47 | http_.begin(url.c_str(), kFirebaseFingerprint);
| ^
In file included from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:9:
C:\Users\nitis\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\libraries\ESP8266HTTPClient\src/ESP8266HTTPClient.h:166:10: note: candidate: 'bool HTTPClient::begin(String, uint16_t, String)' (near match)
166 | bool begin(String host, uint16_t port, String uri = "/") attribute ((error("obsolete API, use ::begin(WiFiClient, host, port, uri)")));
| ^~~~~
C:\Users\nitis\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\libraries\ESP8266HTTPClient\src/ESP8266HTTPClient.h:166:10: note: conversion of argument 2 would be ill-formed:
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:47:30: error: invalid conversion from 'const char*' to 'uint16_t' {aka 'short unsigned int'} [-fpermissive]
47 | http_.begin(url.c_str(), kFirebaseFingerprint);
| ^~~~~~~~~~~~~~~~~~~~
| |
| const char*
In file included from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:9:
C:\Users\nitis\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\libraries\ESP8266HTTPClient\src/ESP8266HTTPClient.h:167:10: note: candidate: 'bool HTTPClient::begin(String, const uint8_t*)' (near match)
167 | bool begin(String url, const uint8_t httpsFingerprint[20]) attribute ((error("obsolete API, use ::begin(WiFiClientSecure, ...)")));
| ^~~~~
C:\Users\nitis\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\libraries\ESP8266HTTPClient\src/ESP8266HTTPClient.h:167:10: note: conversion of argument 2 would be ill-formed:
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:47:30: error: invalid conversion from 'const char*' to 'const uint8_t*' {aka 'const unsigned char*'} [-fpermissive]
47 | http_.begin(url.c_str(), kFirebaseFingerprint);
| ^~~~~~~~~~~~~~~~~~~~
| |
| const char*
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp: In member function 'virtual void FirebaseHttpClientEsp8266::begin(const string&, const string&)':
C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:51:60: error: invalid conversion from 'const char*' to 'const uint8_t*' {aka 'const unsigned char*'} [-fpermissive]
51 | http_.begin(host.c_str(), kFirebasePort, path.c_str(), kFirebaseFingerprint);
| ^~~~~~~~~~~~~~~~~~~~
| |
| const char*
In file included from C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:9:
C:\Users\nitis\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\libraries\ESP8266HTTPClient\src/ESP8266HTTPClient.h:168:70: note: initializing argument 4 of 'bool HTTPClient::begin(String, uint16_t, String, const uint8_t*)'
168 | bool begin(String host, uint16_t port, String uri, const uint8_t httpsFingerprint[20]) attribute ((error("obsolete API, use ::begin(WiFiClientSecure, ...)")));
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
Using library ESP8266WiFi at version 1.0 in folder: C:\Users\nitis\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\libraries\ESP8266WiFi
Using library firebase-arduino-master at version 0.1 in folder: C:\Users\nitis\OneDrive\Documents\Arduino\libraries\firebase-arduino-master
Using library ArduinoJson at version 5.13.5 in folder: C:\Users\nitis\OneDrive\Documents\Arduino\libraries\ArduinoJson
Using library ESP8266HTTPClient at version 1.2 in folder: C:\Users\nitis\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\libraries\ESP8266HTTPClient
exit status 1
Error compiling for board NodeMCU 1.0 (ESP-12E Module).

[MrNitishroy]

Esp8266 board change version to esp8266 2.7.4

[L3WD35]

It is still the same problem bro

Esp8266 board change version to esp8266 2.7.4