Bluetooth-RPi-Python

A Python script running on Raspberry Pi 3 to receive commands (data) from / send executed results to an Android Device over bluetooth. Bluetooth-RPi-Python is used with this Android App: Bluetooth-RPi

Instruction

Step 0 - Install the bluetooth softwares

Open terminal, install softwares:

sudo apt-get update

sudo apt-get install bluez bluez-utils minicom

Step 1 - Setup the SPP (serial port profile)

Open terminal, edit this file

sudo nano /etc/systemd/system/dbus-org.bluez.service

Add -C at the end of the ExecStart= line, to start the bluetooth daemon in 'compatibility' mode. Add a new ExecStartPost= immediately after that line, to add the SP Profile. The two lines should look like this:

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

ExecStartPost=/usr/bin/sdptool add SP

Step 2 - Automatically listen to hci0 channel and run this python code

Create a new service unit file:

sudo nano /etc/systemd/system/rfcomm.service

Edit the file:

[Unit]
Description=RFCOMM service
After=bluetooth.service
Requires=bluetooth.service

[Service]	
ExecStart=/usr/bin/rfcomm watch hci0 &; /usr/bin/python2 /home/pi/DIRECTORY_TO_YOUR_PYTHON_CODE/bluetooth-RPi-wifi.py	

[Install]
WantedBy=multi-user.target

NOTE: There is only one line of code in [Service] section and there is a space between bin/python2 and /home

Save it, Enable the service unit file:

sudo systemctl enable rfcomm

Step 3 - Add the bash command hciconfig hci0 piscan in the file “/etc/rc.local” (before the last line of “exit 0”)

sudo nano /etc/rc.local

Step 4 - Set the “discoverableTimeout” to “0” in the file “/etc/bluetooth/main.conf”

sudo nano /etc/bluetooth/main.conf ( you can set the value to what ever you want your RPi to stay in discoverable mode)

Step 5 - Reboot your RPi

Now, your RPi is able to receive commands (data) from / send executed results to an Android device.