I need to transfer wirelessly a message of maximum 5 bytes of data (including everything such as start bits, stop bits etc etc).
Are there any other options?
Considering that I'm pretty much a beginner into wireless communications:
Is it even possible to do it without reinventing the wheel?
Are there any devices that can send only as few bytes as I need?
Distance: in the order of kilometers, but a few meters is ok too for now