Increment value.

 | Data byte | Description  | 
 | :---------: | -----------   | 
 | 0         | Optional byte that have a meaning given by the issuer of the event.        | 
 | 1         | Zone for which event applies to (0-255). 255 is all zones.        | 
 | 2         | Sub-zone for which event applies to (0-255). 255 is all sub-zones.   | 
 | 3-7       | Increment as unsigned integer. The range can be adjusted by the user by sending just the needed number of bytes (1-5) which form the unsigned integer (MSB first). If omitted (or 0) 1 is assumed as default increment value. | 
