No remote request flag is set when sending such frame with interface socketcand

[aviatorhh]

Describe the bug

When sending a frame like

bus = can.interface.Bus(interface='socketcand', channel='can0', host='the.ipa.ddr.ess', port=29536)
...
can_msg = can.Message(is_extended_id = False, arbitration_id = address, is_remote_frame = True)
self.bus.send(can_msg)

the terminal message print is:

Timestamp:        0.000000    ID:      403    S Rx   R            DL:  0

but on the bus be get (using candump):

 can0       403   [0]                            ''

kinda empty frames.

When using the direct can0 interface (no socketcand) I get correctly:

can0       403   [0]  remote request

To Reproduce

Using python_can==4.6.1 on a Mac with Python 3.9.6.
socketcand Version 0.6.1 is running on a Debian 13.

Expected behavior

Seeing correct remote request frames