By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Raspberry Pi Stack Exchange is a question and answer site for users and developers of hardware and software for Raspberry Pi. It only takes a minute to sign up. Pairing the Pi with the Android device works fine. I can start my python script to send data from the Pi to the Android device:. Howeverif you change that order or if my Android disconnects for some reason rebooting, restarting the application, out of range, etc.

That is, the write instruction in the above script raises a SerialException. The same problem occurs both with rfcomm watch and rfcomm listen.

How do I ensure a smooth, robust re connection behaviour between my Android device and the RPi 3? The problem comes from the python script which does not close the serial port after the Android device has disconnected. One can implement a mechanism doesn't matter how exactly you want to achieve it that reacts to a Disconnected message received by rfcomm watch. Namely, when the disconnection occurs, you want to.

So when the Android device tries to reconnect after some time, rfcomm watch rightfully complains:. To circumvent the problem, one can implement a mechanism does not matter how exactly you want to achieve it that reacts to a Disconnected message received by rfcomm watch. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Automatically re connect paired Bluetooth devices Ask Question.

Asked 3 years, 2 months ago. Active 3 years, 2 months ago.Review your favorite Linux distribution. Welcome to LinuxQuestions. You are currently viewing LQ as a guest.

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Has anyone an idea what might cause such behaviour. I'm not sure where the problem is then. Which services are you using that you can't connect directly with? All the services work using the link set up with rfcomm.

It seems untidy to need to to explicitly connect using rfcomm as root rather than use the normal automatic mechapinnism with bluetoothd.

It took a lot of experimenting and searching to get the connection to work. Issues like this make it hard to get a system going "out of the box", so if the bug can be documented, or better, fixed, it would make it easier for the next user.

If no-one has already found or knows an answer to this, I'll eventually spend a bit more time, and try to pinpoint the problem. If I can determine why hci does not work I'll put in a bug report.

rfcomm connect hci0

BlueZ will establish the connection when you actually use a service, you shouldn't need to pre-connect with "cc". So for example when you try to push a file to the phone with obexftp, it would connect as soon as you run the command and then disconnect once it has been transferred.

You don't need to setup a link before running a service. It isn't a bug, that is how it is setup to work. Bluetooth devices don't remain constantly linked like WiFi or other protocols, as it would drain the battery too fast on mobile devices.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The test application below does connect to the device LED flashes but connection is dropped immediately after that. I'm pasting two test apps below: one that actually tries to read from input stream and second one that just sits there, waiting for the device to disconnect after 5 seconds.

Some background info: I can connect to the Zeemote from my laptop perfectly fine using bluez tools log attached as well. I'm quite at a loss here, I worked on it for so long that I ran out of ideas so any help would be very much appreciated even if you don't know the answer :. Also try to change argument value in range in this m. As simple:. I merged code I had written and code from [android-beginners] Re: Serial over Bluetooth by XCaffeinated] 1 and the above post.

The main addition for this code is add better handling on the exceptions thrown by connect. One small thing: try your UUID without hiphens. Also, the way your test method is written leads me to believe the test is making the connection, defining a thread, telling it to start and immediately returning. In other words, your thread is referencing a variable from outside of the thread which is part of the test method but when test dies, so does its variables. In short, try your testing outside of a thread and get it working there first.

One easy way to do this would be to use Thread. Code above not worked on Samsung Galaxy tab 2 with 4. Hope this will help, I struggled with this issue for more than 3 hours.

Learn more. Ask Question. Asked 10 years ago. Active 5 years, 3 months ago. Viewed 61k times. This problem has been solved!

rfcomm connect hci0

Thanks a lot to Brad, Denis and junkie! You're the heroes! It connects to Zeemote and reads data from it. I'm quite at a loss here, I worked on it for so long that I ran out of ideas so any help would be very much appreciated even if you don't know the answer : Thanks, Max Test application No. UUID IOException: Software caused connection abort ZeeTest: ms total ms Browsing C:4DA Gilead Gilead 1, 2 2 gold badges 17 17 silver badges 26 26 bronze badges. Am facing the same issue in Nougat 7.

Tried this workarounds but no luck so far.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. It only takes a minute to sign up. I'm trying to setup a virtual serial port though a USB-Bluetooth adapter on Linux and send a message to it through an Android device.

I'm on kernel 3. I'm able to pair to the device successfully using gnome-bluetooth and also able to send files to it.

Here I enter the container "context" and run /bin/sh inside

Once that happens, I'd like to use something like cutecom to send messages back and forth to the connected device. They all fail. Given that I can pair successfully and send files without any issues, I know that bluetooth pairing and communication works. I'm not too sure what else I can try. I seem to have gotten this working now. Bluetooth seems a bit finicky. I'm recapping my steps in full in case someone else finds it useful though its pretty much what I tried initially.

This is for Android JB 4. Ensure your adapter is visible can be set in gnome-bluetooth -- you should see a bluetooth system tray icon. Turn on bluetooth on your Android device. Use Android to pair to the adapter I was unable to pair the other way around from Linux. A dialog will come up asking you for a key.

Put in any PIN you want. Gnome should pop up a notification asking you for a key; put in the same PIN you entered earlier. Your Android device and the key should be paired at this point. If you already have a serial port service, make a note of what channel it is. If you don't, you can add the service:. Hopefully, the application was able to connect. You'll see additional verification in the terminal where you blocked listening with a message like:.

You can see stuff show up as you type by opening up a new terminal and doing something like:. Firstly you have to pair the devices. Pairing is relatively easy. I will call client who starts talking and server who replies.

When you call the last command rfcomm connect This represents the serial link between both. The last server command: rfcomm watch In connection lost, the command will restart a new 'listen' state. I solved this with a slight variation to Pris's commands. Give these a shot if anyone is still having problems setting up a rfcomm connection.

I have tried different bluetooth tools and it has been hard to find the correct sequence of commands to connect and exchange data with a bluetooth module. Try using rfcomm and minicom:. Then use minicom with sudo and save a configuration in which you specify the baudrate and the port.For developer information see the Bluetooth page. This documents describes what you need to do to use Bluetooth to communicate with other Bluetooth devices.

The steps described below are required before you can use the services Bluetooth offers. Make sure the Bluetooth daemon is running. If it's not running, start it.

This is referred to as Pairing. Note that pairing is usually only required the first time two devices interact.

How to use Bluetooth Controllers with Python on Raspberry Pi

Afterwards, they will remember each other, and no exchange of PINs is necessary. This will however depend on the devices involved on some devices this may be configurable. To pair devices, you need a passkey-agent. On your Bluetooth device you can now try to pair. On the device you need to choose something like the "setup", "connect" or "Bluetooth" menu and then search for Bluetooth devices. You should find your Debian system, called something like debian-0where debian is the hostname of your Debian system.

On your device, select the Debian system. The device will then ask for a PIN, you can make one up, choose four digits, say Click on the information balloon. Another window will pop-up. It asks for the PIN, enter the one you just made up.

Your phone sees that the PIN matches and shows it on its display. Both devices are now paired.Updated - June 25, by Arnab Satapathi. So how to connect, pair and manage those bluetooth devices from a Linux PC, let's start.

Most bluetoth adapters are USB based and could be configured with HCI utilities, some bluetooth devices like Atheros bluetooth adapters may require device firmware installed in the system.

To install required software packages on Debain or other Debian derivatives like UbuntuLinux Mint run the commands below. Before start scanning make sure that your bluetooth device is turned on and not blocked, you can check that with the rfkill command. If the bluetooth device is blocked soft or hard blockedunblock it with the rfkill command again. Check the output of the sdptool command, you may want to filter the result with the grep command. So, bluetooth service discovery is useful to determine the type of the device, like if it's a bluetooth mp3 player or it's a keyboard.

Connecting to the bluetooth device with rfcommthis command requires root privilege, so use sudo. Now receive some file from the remote device, an OBEX server example, first start bt-obex in server mode listening for bluetooth connection.

Now send some file from the bluetooth client device, i. The sent file should be in the bt-obex output folder. So, you've got a basic idea of using the the hcitool command to configure bluetooth devices on Linux. Here's a list of almost every parameter related with the command. Anyway you can run the hcitool -h command to get a short overview of same, and the man pages are always helpful.

How to use these arguments? Fist if you have multiple bluetooth adapters, and want to use a specific device, then use use the -i flag, like below. I used a USB bluetooth adapter, hci1 in this case to scan a Logitech keyboard. Which is a BLE device, can't be detected by my laptop's default bluetooth device. Note: If the -i flag is not used, then the first available local bluetooth device will be used.

Now the list of commands. In the next tutorial about bluetoth I'll discuss about how to setup a dial-up internet connection via bluetooth in Linux. Managing bluetooth devices could be even more easier with graphical tools like bluedevil for KDE desktop, Gnome-Bluetooth for Gnome desktop or general purpose Gtk2 application blueman.

So when these commands are useful? If you have any suggestion or question just leave a comment, also don't forget to share this with your friends. May be you need to unblock the bluetooth interface with rfkill command. After rebooting my pi bluetooth does not work anymore.

Bluetooth service seems to be enabled but not active. Because I wanted to access bluetooth scan via docker container without privileged mode. Hello Arnab, I want use this hci commands in my python program so that my programs makes bluetooth on and discoverable.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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rfcomm connect hci0

Already on GitHub? Sign in to your account. I'm trying to get my bluetooth dongle working inside a docker container. When I try to start bluetoothd it says. The same command works on the host machine without any issues. The bluetooth modules are all loaded:. It doesn't matter how I run the container.

Hi marcoh00do you have a minimum Dockerfile that shows this behavior? I have a Pi 2 with Bluetooth hardware and with Docker running, so I should be able to do a similar test.

Setup bluetooth in Linux part 2 - hcitool, bluez and rfcomm

What do you get when you run lsusb inside the container and outside the container? I'm sharing the dbus socket directories, too. I was able to build an image from your Dockerfile by replacing your base image with one from Dockerhub from the Resin. I think your problem is that bluetoothd is already running on the host, so the daemon can't register with dbus because the host's bluetoothd already did that.

I just had a quick look into bluetoothd's source code. That would explain why we receive different errors. I'm currently using Collaboras's Debian Jessie image with a self-compiled kernel from raspberry pi kernel repo with aufs patches included. I will try to reproduce the issue on amd64 later as I guess it is not limited to arm or the raspberry pi.

When I stop the bluetoothd on the host, I get the same error message that you do when I start it on the container:. I found these two:. I think the right approach is to run bluetoothd in the host, and then to talk to it over D-Bus using something in the container to set up that connection, but I don't quite yet know what that is. The resin.

I just had a quick look at the repositories you mentioned.