Introduction - If you have any usage issues, please Google them yourself
The sender:
Simply modify the transmission mode to the reception channel number (channel number received here refers to the receiving end of the channel number, the sender uses only P0 channel to send data).
Receiving end:
Without modification.
When the receiver receives the channel number and the time of debug data will be greater than 5, I believe that since the receiving end after receiving the data, it sends a response signal, the process is invisible to the user, performed by the module itself. When the module is in sending state, STATUS register is 0X1E, calculated by the function obtained will appear Show channel number greater than five.