Transmit data to OMG via RF433

Hi there all,
I have a NodeMcu + SRX882 (a 433Mhz receiver) and put on OMG (dev)
and all it’s work.

Now I want to put some simple code on an Arduino + STX882 in order to transmit
data to the OMG.

So my question is… what type of RF code(modulation) can I use in order to transmit some data
and OMD receive it please ?

Thanks all