Environmental gas sensor BME680

• Temperature / humidity / barometric pressure / gas sensor module BME680 is operated by Rasberry pi.
• Download bme680.h, bme680_defs.h from Github Bosch Sensortec.
• Download pepobme680.tar.gz from the osdn site.

  cc pepobme680.c bme680 -o pepobme680
  ./pepobme680

  It keeps outputting the following contents to /www/remote-hand/tmp/.pepobme680 about every 10 seconds.
  Date and time, temperature, humidity, atmospheric pressure, gas resistance

  [iot02f:root#] cat /www/remote-hand/tmp/.pepobme680
  2021/01/29/17:13:48,10.3,62.7,1016.1,5089877