Monitors humidity sensors.

Usage: humidity_control [options]
  -h, --help                       Display this screen

Configuration:
- (1) file as specified by environment variable HUMIDITY_CONTROL_CONFIG_FILE,
- (2) /data/.config.

Monitors an ESP32 microcontroller which provides humidity data given by an FC37 humidity sensor via a webservice. Respective ESP32 software can be found here:

/Users/ms1/Programmierung/Arduino/esp32_humidity_server/esp32_humidity_server.ino

Needs a YAML configuration file either in /data/.config or as specified by the environment variable HUMIDITY_CONTROL_CONFIG_FILE.

Start the control program in the background, write all output to logfile log.txt:

bin/humidity_control &> log.txt &

Alternatively, using setsid to invoke the control program in the background without being connected to the process hierarchy, which is useful when being invoked from an ssh session:

setsid bin/humidity_control &> log.txt

Following points need to be taken care of:

• If sensor is up after being not available, sent status update
• Update config: Time to send status SMS
• Handle multiple sensors
• Rescue IOError and redo while alerting
• Overwrite LOGGER.warn with @@warnings += 1?