ESP32 #31: Playing Sound / MQTT Sound

#ESP32 playing sound using the led lib with different frequencies and also using MQTT via HTTPS and WebSockets to activate music.

Example code:
https://github.com/pcbreflux/espressif/tree/master/esp32/app/ESP32_gpio_buzzer
https://github.com/pcbreflux/espressif/tree/master/esp32/app/ESP32_mqtts_sound

Development Environment

ubuntu 16.04 64 Bit (https://www.ubuntu.com/)
Eclipse Neon (https://www.eclipse.org/)
esp-idf commit 57486a1f618fa39771e7e1e875fd4ab59584e2c5 Date: Fri Mar 17 14:21:45 2017 +0800 (https://github.com/espressif/esp-idf)
xtensa-esp32-elf-gcc (crosstool-NG crosstool-ng-1.22.0-61-gab8375a) 5.2.0 (https://dl.espressif.com/dl/xtensa-esp32-elf-linux64-1.22.0-61-gab8375a-5.2.0.tar.gz)
Arduino 1.8.1 (https://www.arduino.cc/)
arduino-esp32 commit a83dd5f2b5bde6c2b2ac846fd1d1a7cd902899da Feb 17 14:55:07 2017 +0100 (https://github.com/espressif/arduino-esp32)

ESP32 Adapter (send the gerber-files to your boardhouse)
https://github.com/pcbreflux/espressif/tree/master/esp32/kicad/ESP32-adapter
https://github.com/pcbreflux/espressif/blob/master/esp32/kicad/ESP32-adapter/ESP32-adapter.png

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