Bluetooth Communication over MatLab

Asked by Chris Morman on 3 Apr 2012

Latest activity Commented on by Vinod on 14 Dec 2017

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I'm trying to send a simple binary file to a paired bluetooth device, but having a lot of difficulty. I'm using 2012a, so the bluetooth support is available.

Following is a sample of my setup to ensure that I am paired with the device.

>> instrhwinfo('bluetooth')
ans = 
          RemoteNames: {6x1 cell}
            RemoteIDs: {6x1 cell}
      BluecoveVersion: 'BlueCove-2.1.1-SNAPSHOT'
       JarFileVersion: 'Version 3.0.0'
>> ans.RemoteNames
ans = 
      'FRANK'
      'WENDY-VAIO'
      'FRANK-PC'
      'DESALLAR-WS'
      'HOMEPC'
      'CHRIS-PC'
>> bt = Bluetooth('FRANK')
     Bluetooth Object : Bluetooth-FRANK:0
     Communication Settings 
        RemoteName:         FRANK
        RemoteID:           002243F270C7
        Channel:            0
        Terminator:         'LF'
     Communication State 
        Status:             closed
        RecordStatus:       off
     Read/Write State  
        TransferStatus:     idle
        BytesAvailable:     0
        ValuesReceived:     0
        ValuesSent:         0

At this point I need to change the Communication state to open so I can use the fwrite command. This is where I have a problem.

I use the fopen command to establish the connection, but get the following error.

fopen(bt)
Error using icinterface/fopen (line 83)
Unsuccessful open: Cannot connect to the
device. Possible reasons are another
application is connected
or the device is not available.

Where do I go from here?

I've read that others have set up a COMM port, but I am of the understanding that this is not needed with 2012a. Is that right?

I know next to nothing about bluetooth connectivity and/or communication. So any information is greatly appreciated.

Thanks

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Answer by Ankit Desai on 5 Apr 2012

Accepted Answer

Hi Chris,

You might want to consider a couple of things:

Make sure that the device is paired prior to accessing it in MATLAB
The line where you create bt is incorrect

You need to pass the channel ID as the second parameter to Bluetooth.

To find out the correct channel ID, use the following function:

btInfo = instrhwinfo('Bluetooth','FRANK')

That should give you the object constructor, including the channel ID required.

Hope that helps.

-Ankit

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Vinod on 20 Nov 2015

This may have to do with the device going into a power save mode and not being discoverable. Try power cycling your device and then executing

>>instrhwinfo bluetooth myDevice.

Edit: My theory is confirmed by this post:

http://forums.adafruit.com/viewtopic.php?f=10&t=56275

Please see page (2) where the adafruit engineers confirm an issue with a discoverability timeout.

You may be able to work around the issue by restarting the module and immediately searching for the device from MATLAB. You may be able to stay connected to the device despite the discoverability timeout.

spike on 10 Oct 2017

hello，The bluetooth device is transmitting data, and matble can't find it. instrhwinfo('Bluetooth')

ans =

HardwareInfo (具有属性):
        RemoteNames: []
          RemoteIDs: []
    BluecoveVersion: 'BlueCove-2.1.1-SNAPSHOT'
     JarFileVersion: 'Version 3.9'

Vinod on 14 Dec 2017

What Operating System are you using? What is the version of MATLAB you are using?

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Answer by siddesh pawar on 9 Sep 2016

Communication State 
    Status:             closed
    RecordStatus:       off

HOW TO SET IT ON.., I.E how to transmit the data 1

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