I wanted to play with the Wi-Fi direct protocol and really understand it as I want to pretend I have a sensor network that follows the pattern:
- wake up
- establish a network
- trade data
- disconnect
- wait for next window
- and repeat.
I have come close, but I can't quite figure out how to get the full protocol to work.
I started with two identical Raspberry PI 4's running Raspbian 10. I have added the following packages:
openssl-server, bison, flex, build-essential,
libglib2.0-dev, dbus-glib-1-dev, libssl-dev, libreadline-dev
I have downloaded and compiled the following:
desktop-file-utils, libnl, wpa_supplicant-2.9
The wpa_suuplicant-2.9 was build and configured using http://www.linuxfromscratch.org/blfs/view/svn/basicnet/wpa_supplicant.html and the information from README-P2P
running iw list shows P2P-client, P2P-GO, P2P-device as being supported
I have modified wpa_supplicant.conf adding the following information:
ctrl_interface=/var/run/wpa_supplicant
device_name=My P2P Device *<device number>*
device_type=1-0050F204-1
running wpa_cli then running p2p_find allows each device to find a printer that is nearby, but not each other
I have played with using p2p_group_add on one of the pis. By using it, I can get the other pi to see the one which I did the p2p_group_add via p2p_find. I haven't fully figured out this procedure yet; however, the problem with p2p_group_add is it skips GO negotiation. This in my mind defeats the purpose of using Wi-Fi direct as I want each pi to take a turn as GO so I can distribute its workload across all devices.
Any help would be much appreciated.
Thank you in advance.
Tim
