From a55f04dc288466c3d07c088f907f7be7bf52178d Mon Sep 17 00:00:00 2001
From: Ivan Kravets <me@ikravets.com>
Date: Thu, 19 Mar 2020 22:36:55 +0200
Subject: [PATCH 1/2] Warn that can't allocate socket for PIO Home

---
 platformio/commands/home/command.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/platformio/commands/home/command.py b/platformio/commands/home/command.py
index 208354bf..229c875e 100644
--- a/platformio/commands/home/command.py
+++ b/platformio/commands/home/command.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# pylint: disable=too-many-locals
+# pylint: disable=too-many-locals,too-many-statements
 
 import mimetypes
 import socket
@@ -63,6 +63,7 @@ def cli(port, host, no_open, shutdown_timeout):
 
     from twisted.internet import reactor
     from twisted.web import server
+    from twisted.internet.error import CannotListenError
 
     from platformio.commands.home.rpc.handlers.app import AppRPC
     from platformio.commands.home.rpc.handlers.ide import IDERPC
@@ -121,6 +122,12 @@ def cli(port, host, no_open, shutdown_timeout):
     click.echo("")
     click.echo("Open PlatformIO Home in your browser by this URL => %s" % home_url)
 
+    try:
+        reactor.listenTCP(port, site, interface=host)
+    except CannotListenError as e:
+        click.secho(str(e), fg="red", err=True)
+        already_started = True
+
     if already_started:
         click.secho(
             "PlatformIO Home server is already started in another process.", fg="yellow"
@@ -129,7 +136,6 @@ def cli(port, host, no_open, shutdown_timeout):
 
     click.echo("PIO Home has been started. Press Ctrl+C to shutdown.")
 
-    reactor.listenTCP(port, site, interface=host)
     reactor.run()
 
 

From 6414e1d9e3bfb7b0fb3e0386db180ff198482c8e Mon Sep 17 00:00:00 2001
From: Ivan Kravets <me@ikravets.com>
Date: Thu, 19 Mar 2020 22:37:16 +0200
Subject: [PATCH 2/2] Bump version to 4.3.0

---
 HISTORY.rst            | 2 +-
 docs                   | 2 +-
 platformio/__init__.py | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/HISTORY.rst b/HISTORY.rst
index ecd4dd04..4771a3c0 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -6,7 +6,7 @@ Release Notes
 PlatformIO Core 4
 -----------------
 
-4.3.0 (2020-??-??)
+4.3.0 (2020-03-19)
 ~~~~~~~~~~~~~~~~~~
 
 * Initial support for an official `PlatformIO for CLion IDE <https://docs.platformio.org/page/integration/ide/clion.html>`__ plugin:
diff --git a/docs b/docs
index 0af3f530..51b7dd49 160000
--- a/docs
+++ b/docs
@@ -1 +1 @@
-Subproject commit 0af3f53030196d1e9dec83e380814048ab9948ce
+Subproject commit 51b7dd49b703fd6156375a93d4bbb6e0890ecb09
diff --git a/platformio/__init__.py b/platformio/__init__.py
index 7df83f59..c5dd8dcc 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-VERSION = (4, 3, "0rc1")
+VERSION = (4, 3, 0)
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"