Setup PlatformIO and TravisCI

.gitignore

@@ -1,4 +1,5 @@
 .pioenvs
+.pio
 
 .clang_complete
 .gcc-flags.json

.travis.yml

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+# Continuous Integration (CI) is the practice, in software
+# engineering, of merging all developer working copies with a shared mainline
+# several times a day < https://docs.platformio.org/page/ci/index.html >
+#
+# Documentation:
+#
+# * Travis CI Embedded Builds with PlatformIO
+#   < https://docs.travis-ci.com/user/integration/platformio/ >
+#
+# * PlatformIO integration with Travis CI
+#   < https://docs.platformio.org/page/ci/travis.html >
+#
+# * User Guide for `platformio ci` command
+#   < https://docs.platformio.org/page/userguide/cmd_ci.html >
+#
+language: python
+python:
+  - "3.7.5"
+
+sudo: false
+cache:
+  directories:
+    - "~/.platformio"
+
+install:
+  - pip install -U platformio
+  - platformio update
+
+script:
+  - platformio ci --lib="./src" -c platformio.ini ./examples/simple/

platformio.ini

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+[platformio]
+default_envs = nodemcuv2
+
+[common]
+lib_deps =
+  ArduinoJson@5.13.4
+
+[env:nodemcuv2]
+platform = https://github.com/platformio/platform-espressif8266.git
+board = d1_mini
+framework = arduino
+monitor_speed = 115200
+build_flags = -std=c++11, -Wl,-Teagle.flash.4m3m.ld, -D PIO_FRAMEWORK_ARDUINO_LWIP_HIGHER_BANDWIDTH, -DARDUINO_ARCH_ESP8266
+lib_ldf_mode = deep
+board_build.f_flash = 80000000L
+upload_speed = 115200
+lib_deps = ${common.lib_deps}
+test_filter = embedded
+
+[env:esp32]
+platform = https://github.com/platformio/platform-espressif32.git
+board = esp-wrover-kit
+framework = arduino
+board_build.partitions = noota_3g.csv
+build_flags = -std=c++11, -DARDUINO_ARCH_ESP32
+lib_ldf_mode = deep
+lib_deps = ${common.lib_deps}
+test_filter = embedded