This is a - development in process - template for a ESP32 based modulat sensor software.

Main development ideas:

• There are several types of tasks, e.g.:
  • sensor read (temp/humidity, air quality, bat activity...)
  • send information, LoRa, WiFi
  • actuator tasks, e.g. switch power on/off on certain circuit if battery voltage is high/low
  • utility tasks, e.g. read time from ntp-server, OTA software update
• Next execution time of each task is stored in the global array (next_run_time) in the non-volatile memory
• A task can set its' next execution time (next read in 60 secs) or it can be set by another task (e.g. sensor read can trigger LoRa transmit)
• After processing all tasks due, the program goes to deep-sleep-state (if enabled) to save battery
• Enabled tasks are selected (in settings.h) with preprocesser directives #define / #undef . This keep keep compiled package as compact as possible. Unfortunately makes source code harder to read.
• Global variables (also task results) are stored in non-volatile memory (RTC_DATA_ATTR 4k) which keeps data during sleep periods.
• Incomplete LoRa transmit blocks deep-sleep
• In the loop-function tasks are executed, if they are due (next_run_time[task number] <= current time ) . Generally sensor tasks are before transmitting and actuator tasks (first we try to get all data in the memory)