* accurate timing of interval instead of sleep()
* some more documentation
* modbus-tcp (anyone want to let me a TCP RTU?)
* group discrete and register reads for single RTU's to reduce modbus traffic
* error checking/reporting on libmodbus calls
* Add alarm thresholds and action calls for scripts or something cute like that
* Buffer database writes if the mysql database is offline, and then flush them when it comes back
* retry after modbus errors