Solved. The problem was that I was running synchronously with breaks to
run the Qt's event loop, and I wasn't allowing enough cycles for the
buffering/sending. Can actually transmit at ~200 kb / s.
I had just been working with setting the speed of a UART bluetooth chip,
and testing with the rfcomm program, so I was thinking in terms of baud
rates. With rfcomm's virtual tty, you can end up with different data
speeds depending on the baud rate setting on the virtual terminal.
On 11/20/19 1:07 PM, jlk wrote:
Wondering how to change the speed of an rfcomm QBluetoothSocket. When
I connect to a QBluetoothSocket on another computer and transmit data,
I get a receive rate on the other computer of about 1 kilobyte/s (9600
Baud?).
I investigated a little. After the connection is made, there is a new
socket on the client computer labeled QDBusConection with protocol
RFCOMM, and another one with protocol: HCI. Both have (0,9) in the
DEVICE field of the lsof command.
I know it's possible to transmit data at higher speeds over rfcomm,
because I can demonstrate it using the Bluez program rfcomm. It looks
like rfcomm also creates an RFCOMM socket and in addition a new device
(dev/rfcomm1). You can increase the connection speed by setting the
baud rate on the device.
I guess next step would be to check the source code for rfcomm command
vs qbluetooth library, but I was hoping someone would have a quicker
solution.
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