====== Integración con Canar.io ======

Red http://canair.io/

  * https://www.exploreembedded.com/product/Hornbill%20ESP32%20Dev
  * https://medium.com/@jdreyespaez/en-6-horas-charladitas-se-puede-reportar-calidad-de-aire-en-bogot%C3%A1-88ca8d5bb617
  * Sensor PMSA003:
    *  http://dalegi.com/2018/06/13/pmsa003-low-cost-air-pollution-sensor-accuracy-an-attempt-at-calibration-in-sarajevo/

  * Usamos una librería para el PMS https://github.com/fu-hsi/PMS/ https://github.com/jmstriegel/Plantower_PMS7003

===== Hardware references =====
  * https://prunkdump.github.io/GNUVario-TTGO-T5-website/3-hardware.html
  * https://es.aliexpress.com/item/33048962331.html
  * https://www.cnx-software.com/2019/05/12/low-power-tinypico-esp32-micropython-board/
  * https://trigboard-docs.readthedocs.io/en/latest/index.html#