looihaoting:
I have build 20 lora network by using arduino nano and ra01 to transmit and receive RSS among themselves. I use edited half duplex code from example. My problem is how to retrieve the data from 20 lora to my computer? What is the arduino coding to retrieve the 20 lora data? Please help me. Thank you.
You seem to be assuming that the forum knows what an 'ra01' is, what 'receive RSS' means and what 'data' you want to retrieve.
If you really want help with a problem, then spend some time providing a proper description of the project, the problem, provide the code you are using and links to the components you are using.
However, the obvious question is why have you 'build (a) 20 lora network' but you do not apparently know how to read data from the devices you are using ?