Wednesday, July 3, 2013

[android-developers] USBConnection: bulkTransfer OUT => after sending 10-15 x Data's every 4 seconds = USB is disconnected, every time.

I have a problem, I've connected an USB CSR BT Dongle to my Acer A210 Android Device and all is working fine, I can receive endless data without problems.

And also I can send Data with USB "bulkTransfer" successfully:
int send = usbConnection.bulkTransfer(usbEndpointOUT, buf, buf.length, 1);

So, all is working fine.


But after 10-15 times of sending data's (5 Bytes every 4 Seconds) over the usbEndpointOUT with bulkTransfer... I receive only -1 from:

int receive = usbConnection.bulkTransfer(usbEndpointIN, buffer.array(), buffer.array().length, 1000);  


....and then the connection is lost.



Do I have to read any other usb EndpointIN's to prevent a Buffer Overflow or something else?



I've tested it with Asus TF700, Galaxy Note 2, ... and Android 3.2, Android 4.03, Android 4.1.2, Android 4.2.2. Always the same issue.

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