P2PForYourThings

C++ APIs for you to easily setup and communicate via smart P2P (using available p2p modules among Wi-Fi Direct / Bluetooth / Bluetooth LE)

= Supported Devices = Raspberry-pi 3 NVIDIA Jetson-TX1

Android

P2PForYourThings-android

Quick Start

How to Get the Source Code

$ git clone https://github.com/sinban04/P2PForYourThings.git
$ cd P2PForYourThings

Pre-requisite

• Install Bluetooth library

$ sudo apt-get install libbluetooth-dev

Check your bluetooth version and if it's > 5.x, then

$ sudo vi /etc/systemd/system/dbus-org.bluez.service

ExecStart=/usr/lib/bluetooth/bluetoothd --compat

$ sudo systemctl daemon-reload
$ sudo systemctl restart bluetooth
$ sudo chmod 777 /var/run/sdp

• Check the wifi module support p2p

$ iw list

• Modify the wpa_supplicant.conf (/etc/wpa_supplicant/wpa_supplicant.conf) Add two parameters

update_config=1

driver_param=p2p_device=1

• Install UDHCPD for wifi-direct

$ sudo apt-get install udhcpd
$ sudo touch /var/lib/misc/udhcpd.leases

• Set wpa_supplicant configuration

sudo wpa_supplicant -iwlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf

How to Build the Source Code

// No need to make the new directories now (Already exists)
$ mkdir bin obj ./device/obj 
$ make

Then you can find the binary file of the communicator test example, which is in the tests/ directory.

How to Run

$ sudo ./bin/test

Notes

Bluetooth Issues

Bluetooth Version Compatibility

Check your bluetooth version using

$ sudo vi /etc/systemd/system/dbus-org.bluez.service

ExecStart=/usr/lib/bluetooth/bluetoothd --compat

$ sudo systemctl daemon-reload
$ sudo systemctl restart bluetooth
$ sudo chmod 777 /var/run/sdp

Check the bluetooth HCI interface

$ hciconfig -a

Change hci0 interface to Scan Mode

Set page scan and inquiry can (Discoverable)

$ sudo hciconfig hci0 piscan

Change the hci0 interface name

e.g., change the name of the bluetooth interface to 'pi'

$ sudo hciconfig hci0 name pi

Turn on the interface

$ sudo hciconfig hci0 up

Turn on the bluetoothd (For the case, it's off)

sudo service bluetooth start

When the bluetooth.target is masked, unmask it

$ sudo systemctl unmask bluetooth

Check the bluetoothd exists

$ ps -ef | grep bluetooth

Wifi-Direct Issues

Remove the P2P group (Wifi-direct) on the wifi interface

remove group p2p-wlan0-1 on the wifi interface wlan0

sudo wpa_cli -i wlan0 p2p_group_remove p2p-wlan0-1