From e84e9c153e6cfea92f8e6eca8c3003b0028e48e3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juraj=20Andr=C3=A1ssy?= <jandrassy@users.noreply.github.com>
Date: Mon, 17 Jan 2022 15:12:22 +0100
Subject: [PATCH] Print.flush() - Arduino API conformance (#6084)

---
 cores/esp32/Print.h  | 3 +++
 cores/esp32/Stream.h | 1 -
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/cores/esp32/Print.h b/cores/esp32/Print.h
index 4493d4f8..7aa1a2d0 100644
--- a/cores/esp32/Print.h
+++ b/cores/esp32/Print.h
@@ -108,6 +108,9 @@ public:
     size_t println(const Printable&);
     size_t println(struct tm * timeinfo, const char * format = NULL);
     size_t println(void);
+    
+    virtual void flush() { /* Empty implementation for backward compatibility */ }
+    
 };
 
 #endif
diff --git a/cores/esp32/Stream.h b/cores/esp32/Stream.h
index 2debee7e..8df8226d 100644
--- a/cores/esp32/Stream.h
+++ b/cores/esp32/Stream.h
@@ -48,7 +48,6 @@ public:
     virtual int available() = 0;
     virtual int read() = 0;
     virtual int peek() = 0;
-    virtual void flush() = 0;
 
     Stream():_startMillis(0)
     {