MATLAB serial communication via Bluetooth SPP

I have some sensors with Bluetooth SPP connections. I cannot seem to get MATLAB Serial IO to work with them. The 'Standard Serial over Bluetooth link' COM port entries are available in Device Manager, the port settings (in Device Manager and the MATLAB serial function call) are correct. On using fopen() the error seen is that the requested com port is not available. This is confirmed using instrhwinfo('serial') as the requested COM port is not in the list.

I know the Bluetooth SPP is working because the only way I could get the devices working with MATLAB was to use a third party com2tcp forwarder, then use MATLAB's tcpip function to access the port. However, this is not ideal since the com2tcp forwarder is not that reliable. I'd rather be using MATLAB's serial io.

Could this be an issue with the java version being used? version('-java') gives 'Java 1.6.0_24-b07 with Sun Microsystems Inc. Java HotSpot™ 64-Bit Server VM mixed mode'.

My set up is Windows 7 Enterprise 64-bit, MATLAB 7.11.0 (R2010b) 64-bit.

[Chirag Gupta]

Could you try and access the serial port from hyperterminal?

Answer 1

[Eric Wetjen]

Hi Christopher,

Bluetooth SPP support was added to Instrument Control Toolbox in R2011b. See the documentation here for details.

Eric

[Christopher]

Excellent! Good things come to those who wait.

Answer 2

[Gerd]

HI Christopher,

did you connect the sensors after Matlab is running. It is always a problem for Matlab to show the correct Serial Ports if they were connected after starting Matlab

Gerd

[Christopher]

Gerd,

no, they are already visible in device manager before starting Matlab.

Chris

[Alexander Slovak]

Did you solve this problem? I have the same.

Using bluetooth object isn`t suitable for me because I use Simulink model. But there is no block with bluetooth support.

Answer 3

[Roberto]

I have some problems running Bluetooth with matlab

I´m trying to use the SSP port as a COM port, so when I try to connect, then the bluetooth port freezes and I need to turn off and on the bluetooth module...

So after trying a lot to use COM port itself(because sometimes the connection works) so i change my aproach and use the Bluetooth interface

follow this and be happy

1) Finding the Bluetooth

   >> mydevices = instrhwinfo('Bluetooth')

   mydevices = 

     HardwareInfo with properties:

        RemoteNames: {4x1 cell}
          RemoteIDs: {4x1 cell}
    BluecoveVersion: 'BlueCove-2.1.1-SNAPSHOT'
     JarFileVersion: 'Version 3.7'

2) If you have more than one Bluetooth paired, they will show something weird in de RemoteName with the number of devices ... you can list all doing:

   >> mydevices.RemoteName

   myDevices =

       'MY_DEVICE'
       'OTHER_DEVICE1'
       'OTHER_DEVICE2'
       'OTHER_DEVICE3'

3) So you can discover the Channels to connect

   >> instrhwinfo('Bluetooth', 'MY_DEVICE')

   myDevices = 

   HardwareInfo with properties:

               RemoteName: 'MY_DEVICE'
                 RemoteID: 'btspp://201603085239'
    ObjectConstructorName: {'Bluetooth('MY_DEVICE', 1);'}
                 Channels: {'1'}

4) Now start a link... but the status still "closed"

   >> b = Bluetooth('BASE_IA',1)

   Bluetooth Object : Bluetooth-MY_DEVICE:1

   Communication Settings 
      RemoteName:         MY_DEVICE
      RemoteID:           btspp://201603085239
      Channel:            1
      Terminator:         'LF'

   Communication State 
      Status:             closed
      RecordStatus:       off

   Read/Write State  
      TransferStatus:     idle
      BytesAvailable:     0
      ValuesReceived:     0
      ValuesSent:         0

5) Now open the connection

   >> fopen(b)

6) Send data

   >> fwrite(b, 'Text to send')

7) Close

   >> fclose(b)

Source: http://www.mathworks.com/help/instrument/bluetooth.html

[Rubin Alejandro]

osea que desde simulink, no es posible, ??? no existe un bloque, una libreria, lo que sea que permita leer/escribir al puerto mediante bluetooth?