Bluetooth Communication over MatLab

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

Answer 1

[Ankit Desai]

Hi Chris,

You might want to consider a couple of things:

1. Make sure that the device is paired prior to accessing it in MATLAB
2. 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

[Chris Morman]

Sorry for the late reply and thanks for the advice. I am able to write data now, but the phone does not respond.

When you send a file through the bluetooth manager on Windows, the phone reacts, similar to receiving a text message. When I use the fwrite command in Matlab this does not occur. I check the device and it claims to have been sent values. here's my work

bt

Bluetooth Object : Bluetooth-Chris Phone:1

Communication Settings

RemoteName: Chris Phone

RemoteID: 64995DECE368

Channel: 1

Terminator: 'LF'

Communication State

Status: open

RecordStatus: off

Read/Write State

TransferStatus: idle

BytesAvailable: 0

ValuesReceived: 0

ValuesSent: 0

fwrite(bt,105)

>> bt

Bluetooth Object : Bluetooth-Chris Phone:1

Communication Settings

RemoteName: Chris Phone

RemoteID: 64995DECE368

Channel: 1

Terminator: 'LF'

Communication State

Status: open

RecordStatus: off

Read/Write State

TransferStatus: idle

BytesAvailable: 0

ValuesReceived: 0

ValuesSent: 1

So it is clear that the value has been sent, is there a different command to use so that I can read the file from my phone?

Thanks

[MUSTAFA]

i am doing same things and sending data but i cant see it my phone. Can i send file instead of a string? can u help me plz?

[HDying]

hi could you help me? >> a = instrhwinfo('Bluetooth')

a =

        RemoteNames: {'Hphone'}
          RemoteIDs: {'btspp://087A4C001CFC'}
    BluecoveVersion: 'BlueCove-2.1.1-SNAPSHOT'
     JarFileVersion: 'Version 3.2'
>> instrhwinfo('Bluetooth','Hphone')

ans =

               RemoteName: []
                 RemoteID: []
    ObjectConstructorName: []
                 Channels: []

http://www.mathworks.com/matlabcentral/answers/115325-return-empty-when-i-enter-instrhwinfo-bluetooth-hphone

[SunnyvaleGeek]

instrhwfind does not work for me, Matlab says"btInfo = instrhwinfo('Bluetooth','Adafruit EZ-Link 2e96')

btInfo =

HardwareInfo with properties:

               RemoteName: []
                 RemoteID: []
    ObjectConstructorName: []
                 Channels: []

Access to your hardware may be provided by a support package. Go to the Support Package Installer to learn more."

[yong hu]

I'm having the same issue. And I installed the package, the problem remains. Have you figured it out?

[Vinod]

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]

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]

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

[Diogo Simões]

My fopen keeps telling me it can't connect in spite of doing it like Ankit Desai wrote in the first comment

Answer 2

[siddesh pawar]

Communication State 
    Status:             closed
    RecordStatus:       off

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