how to send 4 byte variable in a beacon advertising packet

Question

Hello, i use ibeacon example, this is the reader advertising packet, he has 31 byte long: 
 0201041AFF590002150112233445566778899AABBCCDDEEFAB010200FFC300 
 in this packet i have the uuid, major, minor, flags, tx power, etc... 
 this packet structure complain with the apple Defined iBeacon Data en.wikipedia.org/.../IBeacon 
 this packet has the maximun 31 bytes of advertising packet... 
 i can advertising a packet with a defined structure, for example eliminating uuid, major, minor bytes to insert data variables??? 
 Best Regards 
 Nelson

endnode · Accepted Answer

Theoretically you can do whatever you want. It only depends on what compliance you want to break and what not. If you want to stay Apple iBeacon compliant then you basically have only 16-byte UUID (which should correspond to "service" you register on listener side) and 4 bytes of minor+major version fields. If you don't care about Apple packet formats then you can define "Manufacturer Specific" AD object which will give you typically up to 26 bytes to stay BLE GAP compliant. If you don't care about GAP then you can go up to 31 bytes (in BT 4.0/4.1/4.2 while BT5 introduced even longer packets) and if you don't care about BLE at all (you want just to send something on 2.4GHz ISM band) then you can define your own protocol with even bigger payload.