[chirp_users] bf-888s programming data protocol for arduino project

Newbie here, so haven't found how to search topics yet.

I have a project where I have an arduino housed in an enclosure with a baofeng bf-888s. I want to be able to leave the radio on channel one, and program both pre-stored frequencies, as well as manually entered frequencies. The arduino is tied to the audio in and out of the radio. I know enough about arduino coding to generate square wave output and detect square wave input, vary frequency of the data pulses, duty cycle, etc.

What I don't know is what is the protocol for sending a "code plug" to the BF-888s. Anyone know where to steer me? Mr Google doesn't seem to understand my question.