Initial PlatformIO and Travis support

.gitignore

@@ -1 +1,4 @@
 Settings_local.h
+.pioenvs
+.piolibdeps
+lib

.travis.yml

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+language: python
+python:
+    - "2.7"
+
+# Cache PlatformIO packages using Travis CI container-based infrastructure
+sudo: false
+
+git:
+    submodules: true
+
+cache:
+    directories:
+        - "~/.platformio"
+
+env:
+    - PLATFORMIO_CI_SRC=ESP32-mqtt-room.ino.ino
+
+install:
+    - pip install -U platformio
+
+before_script:
+    - cp Settings_CI.h Settings_local.h
+
+script:
+    - platformio lib update
+    - platformio run

Settings_CI.h

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+#define ssid "Travis"
+#define password "123456789"
+#define hostname "esp32_room_presence"
+#define mqttServer "192.168.1.1"
+#define mqttPort 1883
+#define mqttUser "homeassistant"
+#define mqttPassword "123456789"
+#define room "living-room"
+#define channel "room_presence"
+#define scanInterval 15

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]
+src_dir = .
+
+[env:esp32]
+platform = espressif32
+framework = arduino
+board = esp32dev
+lib_deps = PubSubClient, ArduinoJSON