From be13a4913364e772ccafb5047c7f7b57000e60cd Mon Sep 17 00:00:00 2001
From: Juraj Andrassy <juraj.andrassy@gmail.com>
Date: Thu, 30 Dec 2021 11:00:48 +0100
Subject: [PATCH] Print.flush() - Arduino API conformance

---
 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 4493d4f819f..7aa1a2d00a2 100644
--- a/cores/esp32/Print.h
+++ b/cores/esp32/Print.h
@@ -108,6 +108,9 @@ class Print
     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 2debee7e4f9..8df8226d730 100644
--- a/cores/esp32/Stream.h
+++ b/cores/esp32/Stream.h
@@ -48,7 +48,6 @@ class Stream: public Print
     virtual int available() = 0;
     virtual int read() = 0;
     virtual int peek() = 0;
-    virtual void flush() = 0;
 
     Stream():_startMillis(0)
     {