Raspberryy pi 3 BLE Devices

Question

I am new to android.I have Raspberry pi 3 device.I can connect mobile device to Raspberry pi 3 over classic Bluetooth.now i am confused about Raspberry how to connect mobile device to Raspberry over bluetooth low energy.we can connect BLE device to android device and get Characteristics and can write Characteristics.now i want to do same thing in Raspberry pi 3 like (heart rate monitor,MI band 2)

Answer 1

1. Do it using a program

   You can do it programmatically using DBus Calls. DBus is an interprocess Communication method used in linux. You can use DBus bindings for different languages such as python or C to make the DBus calls and do the operations. A few links to help you get started :

   • DBus tutorial - https://dbus.freedesktop.org/doc/dbus-tutorial.html
   • BLE DBus API - https://elinux.org/images/3/32/Doing_Bluetooth_Low_Energy_on_Linux.pdf

2. Using Gatttool from terminal

   Gatttool is a terminal tool just like hcitool. You can use the following commands to get the thing working:

   • hcitool lescan Gives you the list of nearby Low Energy Devices

   • gatttool -b mac_adress_of_le_device -I gives you an interactive session with the mentioned LE device

   • From the interactive session give connect to connect to the device

   • primary to get the primary services.

   • From this result, you can use the handle values to get the list of characteristics of a specific service. characteristics handle

   • To get the value of a characteristic use char-read-hnd handle

   • To get the characteristic descriptor, use char-desc handle

   • to write to a characteristic char-write-req handle value

   Hope This helps!