Update irrigation example to support time limited activation, small c…

[aviateur17]

…hange in scheduler code

Example inject node data in Node Red:
Set Address 101 off
[{"data":0,"type":0,"id":101}]

Get status of address 102
[{"data":0,"type":1,"id":102}]

Set address 103 on for 20 seconds
[{"data":20,"type":0,"id":103}]

Working on multiple array elements but I think some other code needs to be changed before that is supported.

Format of loadFDRS....
loadFDRS(data, type, address);

Get Coil status of address 102 (data value is ignored)
loadFDRS(1, 1, 102);

Turn off (set) Coil at address 102 for an indefinite amount of time
loadFDRS(0, 0, 102);

Turn on Coil (set) at address 102 for an indefinite amount of time
loadFDRS(1, 0, 102);

Turn on (set) Coil at address 102 for 300 seconds
loadFDRS(300, 0, 102);

When turning on coil for certain amount of time the data value
must be 10 or greater and is in units of seconds.