From 3e993156f27b6d48b5770b0e99f9519427224c95 Mon Sep 17 00:00:00 2001
From: valeros <valeros08@gmail.com>
Date: Mon, 8 Mar 2021 12:16:53 +0200
Subject: [PATCH] Suppress printing unnecessary info in silent mode // Resolve
 #3837

---
 HISTORY.rst                 | 1 +
 platformio/platform/_run.py | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/HISTORY.rst b/HISTORY.rst
index 7bac9c82..e9696882 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -13,6 +13,7 @@ PlatformIO Core 5
 
 * Fixed a "The command line is too long" issue with a linking process on Windows (`issue #3827 <https://github.com/platformio/platformio-core/issues/3827>`_)
 * Fixed an issue with `device monitor <https://docs.platformio.org/page/core/userguide/device/cmd_monitor.html>`__ when the "send_on_enter" filter didn't send EOL chars (`issue #3787 <https://github.com/platformio/platformio-core/issues/3787>`_)
+* Fixed an issue with silent mode when unwanted data is printed to stdout (`issue #3837 <https://github.com/platformio/platformio-core/issues/3837>`_)
 
 5.1.0 (2021-01-28)
 ~~~~~~~~~~~~~~~~~~
diff --git a/platformio/platform/_run.py b/platformio/platform/_run.py
index 457983c4..cb5ec995 100644
--- a/platformio/platform/_run.py
+++ b/platformio/platform/_run.py
@@ -134,7 +134,9 @@ class PlatformRunMixin(object):
                 args,
                 stdout=proc.BuildAsyncPipe(
                     line_callback=self._on_stdout_line,
-                    data_callback=lambda data: _write_and_flush(sys.stdout, data),
+                    data_callback=lambda data: None
+                    if self.silent
+                    else _write_and_flush(sys.stdout, data),
                 ),
                 stderr=proc.BuildAsyncPipe(
                     line_callback=self._on_stderr_line,