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Update HardwareSerial.h
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cores/esp32/HardwareSerial.h

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@@ -120,6 +120,7 @@ extern HardwareSerial Serial0;
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#else
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extern HardwareSerial Serial;
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#endif
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extern HardwareSerial Serial1;
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#if CONFIG_IDF_TARGET_ESP32
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extern HardwareSerial Serial2;
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#endif

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