debug menu - add documentation

boards.txt

@@ -189,6 +189,8 @@ generic.menu.DebugLevel.WiFi=WiFi
 generic.menu.DebugLevel.WiFi.build.debug_level=-DDEBUG_ESP_WIFI
 generic.menu.DebugLevel.HTTPClient=HTTPClient
 generic.menu.DebugLevel.HTTPClient.build.debug_level=-DDEBUG_ESP_HTTP_CLIENT
+generic.menu.DebugLevel.HTTPClient2=HTTPClient + SSL
+generic.menu.DebugLevel.HTTPClient2.build.debug_level=-DDEBUG_ESP_HTTP_CLIENT -DDEBUG_ESP_SSL
 generic.menu.DebugLevel.HTTPUpdate=HTTPUpdate
 generic.menu.DebugLevel.HTTPUpdate.build.debug_level=-DDEBUG_ESP_HTTP_UPDATE
 generic.menu.DebugLevel.HTTPUpdate2=HTTPClient + HTTPUpdate

doc/Troubleshooting/debugging.md

@@ -0,0 +1,102 @@
+---
+title: Debugging
+---
+
+## Table of Contents
+  * [Introduction](#introduction)
+    * [Requirements](#requirements)
+    * [Usage](#Usage)
+  * [Informations](#Informations)
+    * [For Developers](#for-developers)
+
+## Introduction
+
+Since 2.1.0-rc1 the core includes a Debugging feature that is controllable over the IDE menu.
+
+The new menu points manage the real-time Debug messages.
+
+### Requirements
+
+For usage of the debugging a Serial connection is required (Serial or Serial1).
+
+The Serial Interface need to be initialized in the ```setup()```.
+
+Set the Serial baud rate as high as possible for your Hardware setup.
+
+Minimum sketch to use debugging:
+```cpp
+void setup() {
+    Serial.begin(115200);
+}
+
+void loop() {
+}
+```
+
+### Usage
+
+1. Select the Serial interface for the Debugging messages:
+![Debug-Port](debug_port.png)
+
+2. Select which type / level you want debug messages for:
+![Debug-Level](debug_level.png)
+
+3. Check if the Serial interface is initialized in ```setup()``` (see [Requirements](#requirements))
+
+4. Flash sketch
+
+5. Check the Serial Output
+
+
+
+## Informations
+
+It work with every sketch that enables the Serial interface that is selected as debug port.
+
+The Serial interface can still be used normal in the Sketch.
+
+The debug output is additional and will not disable any interface from usage in the sketch.
+
+### For Developers 
+
+For the debug handling uses defines.
+
+The defined are set by command line.
+
+#### Debug Port 
+
+The port has the define ```DEBUG_ESP_PORT``` possible value:
+ - Disabled: 	define not existing
+ - Serial: 		Serial 
+ - Serial1: 	Serial1
+
+#### Debug Level 
+
+All defines for the different levels starts with ```DEBUG_ESP_```
+
+a full list can be found here in the [boards.txt](https://github.com/esp8266/Arduino/blob/master/boards.txt#L180)
+
+#### Example for own debug messages
+
+The debug messages will be only shown when the Debug Port in the IDE menu is set.
+
+```cpp
+#ifdef DEBUG_ESP_PORT
+#define DEBUG_MSG(...) DEBUG_ESP_PORT.printf( __VA_ARGS__ )
+#else
+#define DEBUG_MSG(...) 
+#endif
+
+void setup() {
+    Serial.begin(115200);
+
+	delay(3000);
+	DEBUG_MSG("bootup...\n");
+}
+
+void loop() {
+	DEBUG_MSG("loop %d\n", millis());
+	delay(1000);
+}
+```
+