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如何修复 PlatformIO ArduinoJSON ...ConverterImpl.hpp:43:5: error: static assertion failed: To use 64-bit integers with ArduinoJson, you must set ARDUINOJSON_USE_LONG_LONG to 1

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问题：

尝试编译 PlatformIO 项目时，你看到类似这样的错误消息

arduinojson_use_long_long.txt
.pio/libdeps/ESP32/ArduinoJson/src/ArduinoJson/Variant/ConverterImpl.hpp:43:5: error: static assertion failed: To use 64-bit integers with ArduinoJson, you must set ARDUINOJSON_USE_LONG_LONG to 1. See https://arduinojson.org/v6/api/config/use_long_long/
     ARDUINOJSON_ASSERT_INTEGER_TYPE_IS_SUPPORTED(T);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from .pio/libdeps/ESP32/ArduinoJson/src/ArduinoJson.hpp:30,
                 from .pio/libdeps/ESP32/ArduinoJson/src/ArduinoJson.h:9,
                 from include/MQTT/StatusMessage.hpp:2,
                 from src/MQTT/StatusMessage.cpp:1:
.pio/libdeps/ESP32/ArduinoJson/src/ArduinoJson/Variant/ConverterImpl.hpp: In instantiation of 'static void ArduinoJson6185_1::Converter<T, Enable>::toJson(const T&, ArduinoJson6185_1::VariantRef) [with T = long long int (*)(); Enable = void]':
.pio/libdeps/ESP32/ArduinoJson/src/ArduinoJson/Variant/VariantRef.hpp:98:27:   required from 'bool ArduinoJson6185_1::VariantRef::set(T*) const [with T = long long int()]'
.pio/libdeps/ESP32/ArduinoJson/src/ArduinoJson/Object/MemberProxy.hpp:58:5:   required from 'ArduinoJson6185_1::MemberProxy<TParent, TStringRef>::this_type& ArduinoJson6185_1::MemberProxy<TParent, TStringRef>::operator=(TChar*) [with TChar = long long int(); TObject = ArduinoJson6185_1::JsonDocument&; TStringRef = const char*; ArduinoJson6185_1::MemberProxy<TParent, TStringRef>::this_type = ArduinoJson6185_1::MemberProxy<ArduinoJson6185_1::JsonDocument&, const char*>]'

解决方案

将 -DARDUINOJSON_USE_LONG_LONG=1 添加到 platformio.ini 中的 build_flags。如果 platformio.ini 中不存在 build_flags，在 [env:...] 之后创建它

platformio.ini.snippet
build_flags = -DARDUINOJSON_USE_LONG_LONG=1
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