Hardware Flow Control

[aurelien_a]

Dear Sir,

I'm using bluetooth framework in my software on Windows XP and on Windows Vista. I'm using the SPP profile to communicate with a Free2move Bluetooth device which is using also the SPP profile. My problem is the following : my module Free2move is not enough fast to receive the data. I would like to use the Hardware Flow Control with the RTS and the CTS lines. My Free2move module is able to use it, I've succeeded without using the SPP profile with a serial port configured with the hardware flow control. The problem is that Microsoft Windows Vista doesn't works with the serial port in this configuration.
That's why I would like to use the bluetooth framework with hardware flow control. I've succeeded to transfer file with the SPP profile with Bluetooth Framework but if the file is too big, my module Free2move can't follow this rate.
Have you an idea to activate the Hardware Flow Control on Bluetooth Framework ?

Thanks by advance.

[Mike Petrichenko]

Good day!

Thank you for your e-mail. What is the bluetooth drivers you are using?

[aurelien_a]

I think I'm using the Microsoft Bluetooth API and BF Client with the Service Serial Port.

[Mike Petrichenko]

Good day!

I am looking for what I can do for you. I'll let you know the solution.

[aurelien_a]

Hi,

What's up ? Just to know if you think it would be possible ?

Thanks.

[Mike Petrichenko]

Good day!

I think it is possible. But I didn't find the solution. Just checked it. Will work on it on next week.

[aurelien_a]

Good day,

That's really a very good news for me if it would be possible and maybe the next week !

Thanks for your research.

[Mike Petrichenko]

Good day!

I'll try to do so

[aurelien_a]

Hi,

Have you some good news ?

[Mike Petrichenko]

Good day!

Yes and no I'll try to implement such functional in BTF 6 but I am not sure it will work with all APIs.

[aurelien_a]

Hi,

Have you found something or it's more difficult than you thought ?

Thanks.

[Mike Petrichenko]

Good day!

Yes. I found sme solution but didn't work on it yet becasue not all drivers allows to do so.

[Ben]

Hello,

Has anything else been found about HW flow control since the last post on this thread?

I am working on developing a BT application to talk to hardware that my company makes.  The problem we've run into is that it appears the client application on the desktop is sending data faster than the device can process. What the hardware expects is for the client to use Ready-To-Send (RTS) to control data transfer, but I cannot find anything in the WCL for specifying the baud rate or flow control settings.

Any help would be appreciated!

Thanks,
Ben

[Mike Petrichenko]

Good day!

If you use direct bluetooth connection with WCL then you do not need to think about baud rate. If you use Serial connection you can manage the baud rate.

The main problem with baud rate control for BT connection is that no one (in common case, there is some "durty" way exists) driver allows to control the baud rate of the direct bluetooth connection.

[Ben]

Thanks Mike,

I don't think that Baud rate is really the problem any more (we set it down to 9600 and that didn't help). What really appears to be the problem is that the device has a tiny 4 byte message buffer and we are overwriting before the device has a chance to read out of the buffer.

What I've done is after I discover the device I create a wclClient:

Code: [Select]

            _client = new wclClient();
            _client.ClientTransport = wclClientTransport.ctBluetooth;
            _client.BluetoothParams.Address = Address;
            _client.BluetoothParams.Radio = Radio;
            _client.BluetoothParams.Service = wclUUIDs.SerialPortServiceClass_UUID;
            _client.Connect += new OnConnect(OnConnected);
            _client.Data += new OnData(OnReceived);
            _client.Disconnect += new OnDisconnect(OnDisconnected);
            _client.SerialParams.BaudRate = wclBaudRate.br9600;
            _client.Open();
When "OnConnected" is called it calls "Write" on the wclClient to send data.

What I am looking for is a way to use "Ready-To-Send" to control data flow. If I use the SerialPort class in System.IO.Ports I can set RtsEnable to true and I should be golden. Is there an equivalent setting in wclClient?

Alternatively if I pair the device how can I get a COM port assigned? I've tried wclDevice.Pair(...), which succeeds. Then I've tried using either wclSerialPort or wclBluetoothComCreator, but I can't seem to get either one to work.

Thanks again!

Ben