A button has been pressed/released. 

 | Data byte | Description                                                                                                                                                        | 
 | :---------: | -----------                                                                                                                                                        | 
 | 0         | Bits 0,1,2 If 0 the button has been released. If 1 the button is pressed. If equal to 2 this is a key value (press followed by release). Bits 3-7 is repeats 0-32. | 
 | 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         | MSB of code for button.                                                                                                                                            | 
 | 4         | LSB of code for button.                                                                                                                                            | 
 | 5         | MSB of optional code-page.                                                                                                                                         | 
 | 6         | LSB of optional code-page.                                                                                                                                         | 
