Skip to main content

Raspberry Pi Bluetooth Connection

Raspberry Pi 3 provides a built-in Bluetooth module. The latest Raspbian has been bundled with tools for enabling Bluetooth connection. The Bluetooth icon will be shown up on the top right corner of the desktop. It's a tool to discover available Bluetooth devices and connect Pi with Bluetooth devices. It is easy to connect any Bluetooth-enabled electronic device with Pi. But, sometimes Pi will fail to connect, especially for Bluetooth device that has no standardized services.

From a terminal, we can use the bluetoothctl tool to scan and connect with a Bluetooth device. You should make sure that the BlueZ protocol stack has been installed by running $ apt-get install bluez
  1. Run bluetoothctl to enter the tool command window
  2. Turn the power on by running power on
  3. (Optional) You can set AutoEnable=true in /etc/bluetooth/main.conf if you want to make the Bluetooth auto power-on after reboot.
  4. Run devices to see which devices have been paired
  5. Run scan on if your desired device has not been paired yet.
  6. Run agent on
  7. Run pair <mac_address> to start pairing. Then, you need to enter the device PIN if it's needed.
  8. Run trust <mac_address> manually if the device has no PIN.
  9. Run connect <mac_address> to establish a connection.
The last step can fail for certain devices. I also failed to connect my Pi with my Arduino with the HC-06 Bluetooth module. If you use the GUI tool for Bluetooth, it may show you a notification message, "Connection failed: No usable services on this device". If you use the CLI tool (bluetoothctl), it may show you an error message, "Failed to connect: org.bluez.Error.NotAvailable". For the solution, you can try the following steps.
  1. Edit the Systemd configuration of the Bluetooth service by: 
    $ sudo nano /etc/systemd/system/dbus-org.bluez.service
  2. Add compatibility flag "-C" and create a serial port profile. Find and edit or insert these lines.
    ExecStart=/usr/lib/bluetooth/bluetoothd -C
ExecStartPost=/usr/bin/sdptool add SP
  3. Save and reboot your Pi then run again previous steps for pairing Bluetooth device using bluetoothctl.
  4. After the device is paired, you can run sudo rfcomm watch hci0 or sudo rfcomm connect 0 <mac_address> 1. This command will create an access channel in /dev/rfcomm0.
  5. On another terminal, you can run rfcomm to see any created connection.
Finally, you can listen to /dev/rfcomm0 and send data through this channel using any tool like picocom by running $ sudo picocom -c /dev/rfcomm0.


If you think this article is useful, please share it with your colleagues.
Labels:

Comments

  1. Robert stevesonFebruary 20, 2021 at 2:10 PM

    Great post, your all points fully clarify About Bluetooth. These steps are helpful for those who wants know more about Bluetooth Device. Thank you for providing such a valuable information. Spy Bluetooth Device

    ReplyDelete
  2. Dwayne DwayneMay 31, 2021 at 7:19 PM

    This was huge information for all those who need this. That was a really good blog and of course knowledgeable. Thank you for sharing this much information with us. How to send large videos

    ReplyDelete

Post a Comment

Popular posts from this blog

Rangkaian Sensor Infrared dengan Photo Dioda

Keunggulan photodioda dibandingkan LDR adalah photodioda lebih tidak rentan terhadap noise karena hanya menerima sinar infrared, sedangkan LDR menerima seluruh cahaya yang ada termasuk infrared. Rangkaian yang akan kita gunakan adalah seperti gambar di bawah ini. Pada saat intensitas Infrared yang diterima Photodiode besar maka tahanan Photodiode menjadi kecil, sedangkan jika intensitas Infrared yang diterima Photodiode kecil maka tahanan yang dimiliki photodiode besar. Jika  tahanan photodiode kecil  maka tegangan  V- akan kecil . Misal tahanan photodiode mengecil menjadi 10kOhm. Maka dengan teorema pembagi tegangan: V- = Rrx/(Rrx + R2) x Vcc V- = 10 / (10+10) x Vcc V- = (1/2) x 5 Volt V- = 2.5 Volt Sedangkan jika  tahanan photodiode besar  maka tegangan  V- akan besar  (mendekati nilai Vcc). Misal tahanan photodiode menjadi 150kOhm. Maka dengan teorema pembagi tegangan: V- = Rrx/(Rrx + R2) x Vcc V- = 150 / (150+10) x Vcc V- = (150/160) x 5
4 comments
Read more

Kerusakan pada Motherboard

1. Sering terjadi hang memory tidak cocok --- ganti memory ada virus di harddisk --- scan harddisk over clock --- seting kembali clock prosesor ada bad sector di harddisk --- partisi harddisk dengan benar 2. Pembacaan data menjadi lambat memori tidak cukup --- tambah memori harddisk penuh atau ada virus --- kurangi isi harddisk, scan harddisk, atau ganti hardisk 3. CMOS failure baterai habis --- ganti baterai CMOS seting BIOS berubah --- seting kembali BIOS 4. Tidak bisa booting cache memory rusak --- disable eksternal cache memory di BIOS memori tidak cocok --- ganti memori boot sector pada harddisk rusak --- masukkan operating system baru ada bad sector pada trek awal harddisk --- partisi harddisk 5. Suara bip panjang berkali-kali memori rusak --- periksa kedudukan memori memori tidak cocok --- ganti memori memori tidak masuk slot dengan sempurna --- periksa kembali kedudukan memori 6. Suara bip bagus tetapi tidak ada tampilan / bip dua kali VGA card
Post a Comment
Read more

How To Use Git in Netbeans

Git is a popular version control application nowadays. Recently I have created a note about its differences with SVN and how to use it in Eclipse . There are many Git client tools. But I just want to show how to use Netbeans built-in Git tools. It makes the development process easier because it has been integrated with the IDE. Create Remote Git Repository We need a remote Git repository so everyone can store or receive any revision or updated files through the networks. We can set up our own Git server or use a public Git server like Github . In this note, I use Github. 1. Create an account in Github and create an empty Git repository Create an empty public repository in Github 2. Get the remote repository link Your Github Repository URL Create a New Project in Netbeans and Create Local Git Repository After we have a remote Git repository, we can create a project stored in the remote repository. We also need to create a local repository before we can push
1 comment
Read more

I Love Books

I like reading books since I was a kid. Thanks to my parents that let me bought any books and embraced me to read. Bookstore becomes one of my favorite places. I like to learn any topics, not only about science or IT stuffs. For me, reading a book isn't always intended to have possession in the topic, but it's for my personal pleasure and building an insight of something. some of them There're many things around us that we don't understand really well. If we try to figure it out by ourselves, we will waste most of our precious time. So, it's better to learn from the expert who has studied it well and then considering it with our common sense and logic. I grow up, many affairs had occurred, and shit happens. I realize that I have forgotten a lot of things. I likely tend to be aware of fewer things. So let me open a cupboard full of books which I've collected since a long time ago.
Post a Comment
Read more