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follow arduino API: pure virtual Stream::flush() moved to empty virtual Print::flush() (#4029)
re fix #4018
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@ -89,6 +89,8 @@ class Print {
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size_t println(double, int = 2);
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size_t println(const Printable&);
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size_t println(void);
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virtual void flush() { /* Empty implementation for backward compatibility */ }
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};
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#endif
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@ -47,7 +47,6 @@ class Stream: public Print {
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virtual int available() = 0;
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virtual int read() = 0;
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virtual int peek() = 0;
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virtual void flush() = 0;
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Stream() {
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_timeout = 1000;
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