Add LED example for @platformio

Author: ivankravets

examples/PlatformIO/LED/lib/readme.txt

@@ -0,0 +1,41 @@
+
+This directory is intended for the project specific (private) libraries.
+PlatformIO will compile them to static libraries and link to executable file.
+
+The source code of each library should be placed in separate directory, like
+"lib/private_lib/[here are source files]".
+
+For example, see how can be organized `Foo` and `Bar` libraries:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) http://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- readme.txt --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+Then in `src/main.c` you should use:
+
+#include <Foo.h>
+#include <Bar.h>
+
+// rest H/C/CPP code
+
+PlatformIO will find your libraries automatically, configure preprocessor's
+include paths and build them.
+
+More information about PlatformIO Library Dependency Finder
+- http://docs.platformio.org/page/librarymanager/ldf.html

examples/PlatformIO/LED/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; http://docs.platformio.org/page/projectconf.html
+
+[platformio]
+; uncomment below to build a one env
+; env_default= nodemcuv2
+; env_default= esp32dev
+; env_default= samd21g18a
+
+[global]
+lib_deps =
+    https://github.com/mozilla-iot/webthing-esp8266.git
+    ArduinoJson
+
+[env:nodemcuv2]
+platform = espressif8266
+board = nodemcuv2
+framework = arduino
+lib_deps = ${global.lib_deps}
+lib_ignore =
+    ArduinoMDNS
+    WiFi101
+lib_ldf_mode = deep+
+
+[env:esp32dev]
+platform = espressif32
+board = esp32dev
+framework = arduino
+lib_deps =
+    ${global.lib_deps}
+    ESP Async WebServer
+lib_ignore = WiFi101
+lib_ldf_mode = deep+
+
+[env:samd21g18a]
+platform = atmelsam
+board = samd21g18a
+framework = arduino
+lib_deps =
+    ${global.lib_deps}
+    WiFi101
+    ArduinoMDNS
+lib_ldf_mode = deep+
+

examples/PlatformIO/LED/src/LED.cpp

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+/**
+ * Simple ESP8266 server compliant with Mozilla's proposed WoT API
+ * Based on the HelloServer example
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <Arduino.h>
+#include "Thing.h"
+#include "WebThingAdapter.h"
+
+//TODO: Hardcode your wifi credentials here (and keep it private)
+const char* ssid = "public";
+const char* password = "";
+
+#if defined(LED_BUILTIN)
+const int ledPin = LED_BUILTIN;
+#else
+const int ledPin = 13;  // manully configure LED pin
+#endif
+
+WebThingAdapter adapter("w25");
+
+ThingDevice led("led", "Built-in LED", "onOffSwitch");
+
+ThingProperty ledOn("on", "", BOOLEAN);
+
+bool lastOn = false;
+
+void setup(void){
+  pinMode(ledPin, OUTPUT);
+  digitalWrite(ledPin, HIGH);
+  Serial.begin(115200);
+  Serial.println("");
+  Serial.print("Connecting to \"");
+  Serial.print(ssid);
+  Serial.println("\"");
+#if defined(ESP8266) || defined(ESP32)
+  WiFi.mode(WIFI_STA);
+#endif
+  WiFi.begin(ssid, password);
+  Serial.println("");
+
+  // Wait for connection
+  bool blink = true;
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+    digitalWrite(ledPin, blink ? LOW : HIGH); // active low led
+    blink = !blink;
+  }
+  digitalWrite(ledPin, HIGH); // active low led
+
+  Serial.println("");
+  Serial.print("Connected to ");
+  Serial.println(ssid);
+  Serial.print("IP address: ");
+  Serial.println(WiFi.localIP());
+
+  led.addProperty(&ledOn);
+  adapter.addDevice(&led);
+  adapter.begin();
+  Serial.println("HTTP server started");
+  Serial.print("http://");
+  Serial.print(WiFi.localIP());
+  Serial.print("/things/");
+  Serial.println(led.id);
+}
+
+void loop(void){
+  adapter.update();
+  bool on = ledOn.getValue().boolean;
+  digitalWrite(ledPin, on ? LOW : HIGH); // active low led
+  if (on != lastOn) {
+    Serial.print(led.id);
+    Serial.print(": ");
+    Serial.println(on);
+  }
+  lastOn = on;
+}
+